Introduction

Despite the growth of Wireless communication solutions in recent years, fixed wire data, fax and voice communication over the PSTN network is still very much in demand. This section of the catalogue covers the spectrum of single chip modem device sets with Smart DAA, Socket modem modules and single chip modem modules. They all provide easy-to-use, highly integrated solutions that enable fast, error-free transmission of data, fax and voice over PSTN networks.

These products are especially suited to embedded applications in the industrial, medical, IT and communication markets. Modem modules are pre-approved or certified therefore easing the burden of approvals and shortening the time to market, whilst chipsets are more suited to higher volume cost sensitive applications. Typical applications for modem technology include POS and ATM Terminals, security systems, data loggers, elevator communications and leased line data systems.

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MultiTech Modem Selection Guide

CX93021 CSM92-SP Controllered Serial Modem with Speakerphone

Controller-based modem with Worldwide SmartDAA® 4 Line Side Device and Speakerphone for Embedded Applications.

CSM92-SP Evaluation Board

• Elevator Comms
• Retail modems
• Video phone terminals
• Video game consoles
• Internet appliances

Smart DAA

Features
• Modulations and protocols
- ITU-T V.92
- Modem-on-Hold ( V.92 version only)
- Quick connect (V.92 version only)
- PCM upstream (V.92 version only)
- V.90/V.34/V.32bis/V.32
- V.22bis/V.22/V.23/V.21
- V.23 reverse, V.23 half-duplex
- Bell 212A/Bell 103
- V.29 Fast POS
- V22bis fast connect
- V.80 Synchronous Access Mode
• Data compression
- V.44/V.42bis/MNP5
• Error correction
- V.42/MNP 4/MNP 2
• Call Waiting (CW) detection
• Type I and Type II Caller ID (CID) decoding
• DTE/host interface
- Serial DTE interface
- Direct Mode
- Asynchronous Mode
• No external memory required
• 63 embedded and upgrade able country profiles
• Serial NVRAM interface for optional permanent country profile storage
• Embedded AT commands
• Full-duplex speakerphone (FDSP) mode using optional CX20452 Codec
- Microphone and speaker interface
- Telephone handset and headset interface
- Acoustic and line echo cancellation
- Microphone gain and muting
- Speaker volume control and muting
• SmartDAA
- Extension pick up detection
- Digital line protection
- Line reversal detection
- Line-in-use detection
- Remote hang-up detection
- Worldwide compliance
• Selectable 28.224 MHz or 27.000 MHz frequency of operation
• Low power and voltage
- Single +3.3V supply with +3.3V I/O level
- Low power consumption mode

A compact, robust RS232 external data modem reference design package is available in electronic form to minimise application design time, reduce design in costs and accelerate time to market. Included in the package are full data and schematics, board layout in Gerber, bill of materials (BOM) and vendor parts list (VPL).

MT2456SMI-IP SocketModem®

MultiTech's MT2456SMI-IP SocketModem® module is a single-port serial analogue data modem that integrates its dial-up pstn modem functionality with a complete TCP/IP stack in a single product solution. This ready-to-integrate, RoHs compliant, embedded module is based around MultiTech's space-efficient universal socket architecture. It offers the range of SocketModem® products a complete, low cost, internet enabled modem solution that embeds internet protocols within your product allowing it to send and receive data, voice and images over the Internet via email or HTTP without connecting to a PC or gateway server. MT2456SMI-IP SocketModem® brings this Internet connectivity to your embedded product without you embarking on a costly design cycle.

This pre-qualified and homologated module is Telecom approved in over 50 countries making it a truly global solution. The MT2456SMI-IP SocketModem® has an onboard Internet controller, modem controller, datapump and DAA in a complete ready-to-integrate space efficient (2.7 x 6.5cm) module. The onboard Internet processor runs DNS, HTTP, ICMP, IP, IP CP, LCP, POP3, Dial-in RAS, SMTP, TCP, FTP, Telnet an TFTP protocols. Other features include a command line API for Internet configuration plus PAP and CHAP or script authentication support. Being based on the MT2456SMI-xx SocketModem® it takes advantage of industry standard V.42bis data compression and V.42 (LAP-M or MNP 2-4) error correction for a very secure, robust modem solution. It has a wide operating temperature range of 0°C to +70°C. The module is capable of being configured remotely or directly through the UART via a command mode. Many useful features are included such as auto dial, redial, pulse or dial tone, auto answer, adaptive line probing, automatic symbol and carrier frequency during start up, retrain and rate negotiations. The industry standard AT command compatibility of the module enables configuration of the module to bypass the IP features by running in modem (transparent) mode. The MT2456SMI-IP SocketModem® serial DTE channel can be interfaced directly to a UART and for maximum flexibility is configurable and capable of speeds from as low as 300bps through to 230Kbps. The module is available in four variants, V.22bis, V.32bis, V34bis and V.92, giving flexibility to match a solution to specific requirements. The low cost V.22bis variant for example supports V.42bis data compression, V.80 synchronous access mode and V.22bis Fast Connect capability making it an ideal choice for applications such as POS and payment terminals.

Specification/Features:

• Client-to-Client data rate: 33600, 31200, 28800, 26400, 24000, 21600, 19200, 16800, 14400, 12000, 9600, 7200, 4800, 2400, 1200, 0-300bps
• Data format: Serial, asynchronous
• Data: V.92, V.34, V.32, V.32bis, V.22
• Error correction: V.44, V.42 (LAP-M or MNP 2-4)
• Data compression: ITU-T V.42bis
• Serial Interface: supports DTE speeds to 230Kbps
• Modes of operation: Full Duplex over dial-up lines, data mode, command mode and online command mode
• Internet processor runs DNS, Dial-in PPP, HTTP, ICMP, IP, IP CP, LCP, POP3, Dial-in RAS, SMTP, SNMP, TCP, FTP, Telnet and TFTP protocols.
• PAP, CHAP and script authentication support
• Binary Base64 encoding and MIME email formats
• Web server: support for 64K of HTML web pages
• Command line API: for Internet configuration
• AT command compatibility: in modem (transparent) mode for modem configuration (modem mode bypasses the IP features)
• Flash Memory: 2MEG
• Command buffer: 50 characters
• DTMF detection
• Caller ID (US configuration only)
• Ringer Equivalence (REN): 0.4B
  
• Telephony/TAM features:
• Telephone answering machine (TAM)
• V.253 commands
• 2-bit and 4-bit ADPCM, 8-bit linear PCM and 4-bit IMA coding, 8kHz sample rate, concurrent
• Concurrent DTMF, ring and Caller ID detection
  
• Diagnostics: local analogue loop
• Dimensions: 2.7 x 6.5 x 1.8cm (1.045" x 2.541" x 0.680")
• Operating temperature: 0°C to +70°C
• Operating Voltage: 3.3V DC ±10%
  

Power consumption:

• V.22bis: Typical 135mA (.445W @ 3.3V DC), Maximum 195mA (.702W @ 3.6V DC)
• V.92, V.34, V.32: Typical 165mA (.545W @ 3.3V DC), Maximum 225mA (.780W @ 3.47V DC)
  

Dimensions:

• Dimensions: 2.7 x 6.5 x 1.8cm (1.045" x 2.541" x 0.680")
  

Approvals:

• Safety Certifications - UL60950, CUL60950, EN60950, IEC60950, ACA TS001 / AS3260, CCC
• EMC Approvals - FCC Part 15 (Class B), Canadian (Class B), EN55022 (Class B), EN 55024, GB4943, GB9254

Tech Tip: Choosing a Modem

Catalogue looking a bit complicated? Finding it difficult to choose the right modem?

The new SmartModems from Conexant combine all of the ROM, RAM, controller and datapump into one package. Layout becomes easier and we even supply, as part of the silicon, a sub-miniature line interface (DAA) device to provide worldwide connectivity on all telephone networks.

Smart modems are supplied with free schematics and reference design information to make your development path fast and effective. The ‘World’ firmware needs no development and is already masked onto the device itself. If you are looking for a reliable dial-up solution with serial or parallel interface that comes in pin-compatible variants from 2400bps to 56000bps then ask Bob for data.

Use the SCXV.xx and CSMxx series modem chipsets - you will be delighted how rapidly you can implement a design and get your own hardware connected!

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SocketModem® Modules

There are instances whereby you may wish to implement different connectivity options to your application. This would in most cases require different board configurations to fit say a GSM modem instead if a dial-up modem. This can be a costly and time consuming exercise and may increase your BOM or VPL. One way around this is to opt for a MultiTech SocketModem® based design. The basis of this concept is to have a single system design, utilising a space efficient 2.7 x 6.5cm universal socket that allows OEMs to populate it with a wide range of connectivity technologies using a communication-ready SocketModem® module. Development times and costs for system designers can be dramatically reduced. The SocketModem® solutions use industry-standard AT style command sets which simplify development of your software applications. The flexible comm-port architecture currently supports dial-up modem, modem with IP, ethernet, ISDN, bluetooth and GSM/GPRS/EDGE wireless modules. Please refer to the SocketModem® selection guide for all the availability options.

The benefits are clear to be seen, you have fast to market universal socket connectivity solutions that are globally compliant and provide increased system reliability. By designing in a pre-certified SocketModem® module you can significantly reduce your time to market, as it relieves you of the burden of writing modem controller code and by self declaring under the R&TTE directive it can save the time and expense of telecoms aprovals.

GN031105 ED130406

SocketSLIC™Analogue Telephony Interface Module

The MTIFM SocketSLIC™ is a ready-to-integrate, RoHs compliant, embedded Analogue Telephony Interface module. The module has an isolated and programmable analogue-to-PCM interface which offers a flexible solution for selection of the appropriate telephony interface. The benefit of this is that the MTIFM SocketSLIC™ is easily configured either in manufacturing or in the field. The MTIFM SocketSLIC™ is based on a variant of MultiTech's space-efficient socket architecture. This single low cost package, will take care of a whole host of standard analogue interfaces in the market whilst allowing system designers to concentrate on digital design, thus reducing dramatically development time and costs.

The MTIFM SocketSLIC™ is ideal for applications including: Automatic call distributors, digital loop carriers, fax boards, fax servers, fibre-in-the-loop, modems, multiplexers, PBX, PC-IBX, IP-PBX, remote terminals, voice processing boards, VOIP gateways, wireless local loop.

Features

• Ports Per module -
• Analogue Port: 1 (Telephony interface)
• Digital Port: 1 (TDM interface)
• Control Port : 1 (Serial interface)
• Standard Telephony Interfaces -
• Foreign Exchange Subscriber (FXS): Loop-Start or Ground-Start
• Foreign Exchange Office (FXO): Loop-Start or Ground-Start
• Dial Pulse Originating (DPO): Direct-Inward dialling
• Dial Pulse Terminating (DPT): Direct-Inward dialling
• E&M signalling (E&M): 2-wire or 4-wire, Type I, II, III, IV and V signalling
• Pulse Link Repeater (PLR): 2-wire or 4-wire, Type I, II, III, IV and V signalling
• Transmission Only (TO): 2-wire
• Equalised Transmission Only (ETO): 4-wire
• Standard TDM Interfaces -
• AT&T Concentration Highway Interface
• Multi-Vendor Integration Protocol (MVIP)
• Mitel: ST-Bus
• Siemens: PCM Highway
• Standard Serial Interfaces -
• SPI Interface: 3-wire synchronous
• UART Interface: 2-wire asynchronous
• Supports Caller ID and other CLASS services
• Provides loop-disconnect signals
• On-board ring generator and power supply
• Adjustable telecom battery voltage
• Adjustable tx and rx levels
• Adjustable ringing voltage and ringing frequency
• No DIP switches or jumpers

Power requirements

• +5VDC
• Tolerance ±5%
• Current: 0.1A maximum
• Power: 0.5W maximum

Dimensions

• 9.53L x 2.71W x 1.38cmH (3.75"x 1.07 " x .54 ")

Environmental

• Operating temperature: 0°C to +40°C
• Storage temperature: +4 °C to +85°C
• Humidity: 5% to 95% non-condensing

Approvals

• Certifications - CE Mark
• Safety Certifications - UL60950, EN60950,
• EMC - FCC Part 15 (Class A), EN55022 (Class B), EN 55024.
• Telecom - FCC Part 68, CS-03, TBR21

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MT128SMI SocketModem® ISDN

For system developers looking to embed ISDN functionality into their application MultiTech's MT128SMI SocketModem® offers BRI ISDN functionality with an S/T interface in a single universal SocketModem®. This ready-to-integrate, RoHs compliant, embedded module is based around MultiTech's space-efficient universal socket architecture. It offers the range of SocketModem® products a complete BRI ISDN solution with bi-directional bandwidth of up to 128K bps in a single low cost package, whilst allowing you to concentrate on developing other key features of your design, thus reducing dramatically development time and costs.

If you are looking for a modular ISDN solution suitable for remote monitoring, metering, data collection and system configuration applications then the MT128SMI SocketModem® is ideal. With its complete WAN protocol support including PPP, ML-PPP, MP+, V.120, X.75, Raw HDLC, CHAP MD5, and PAP you can connect to a variety of servers. The module can be interfaced directly to a serial UART or micro controller, and the serial DTE channel is capable of transfer speeds up to 230.4Kbps.

MT128SMI SocketModem® ISDN is RoHs compliant and utilises MultiTech's Universal Socket, a flexible comm-port architecture which also provides analogue dial-up, GSM/GPRS, EDGE, Bluetooth or ethernet connectivity with interchangeable modules. A developer kit is available to use for testing, programming and evaluation that includes a development board with RS232 DB-25 connector, MT128SMI SocketModem®, universal PSU, Developer Kit CD, RJ-45 Jack, RJ45 cable and RS-232 cable.

The MT128SMI SocketModem® is ideal for applications including: ATM terminals, credit card verification systems, data collection, gas pumps, industrial and medical remote monitoring systems, POS systems, remote diagnostics, security systems and vending machines.

Specification/Features:

• Complete ISDN modem and S/T interface
• ISDN interface: supports 2B+D Basic Rate Interface (BRI), 4-wire S/T interface
• Rate:64K bps/1 B-channel; 128K bps/2 B-channels; 16K bps/D-channel (for signalling) Synch or Asynch (synch on one B-channel)
• ISDN Switch Types: US National ISDN-1, AT&T 5ESS Custom, Northern telecom DMS-100 Custom, ETSI/DSS1/NET3 (Euro ISDN), Japan NTT INS64, France VN-4
• Protocols: PPP, ML-PPP, MP+, V.120, X.75, Raw HDLC, CHAP MD5, and PAP & Soft Bond B -channel
• Serial interface supporting DTE speeds to 230.4Kbps
• Synchronous and Asynchronous support
• Caller Line Identification (CLID)
• AT command compatible in modem mode
• Flash memory for updating with firmware enhancements
• Space-efficient universal socket connectivity
• Developers kit available.
• 2 year Warranty.

Power requirements:

• 5V DC or 3.3V DC
• Typical: 160mW @ 3.3V or 510mW @ 5V
• Maximum: 182mW @ 3.3V or 543mW @ 5V

Dimensions:

• 2.7 x 6.5 x 1.8cm (1.045" x 2.541" x 0.680")

Operating temperature:

• 0°C to +70°C

Approvals:

• Certifications - CE Mark
• Safety Certifications - UL60950, cUL60950, EN60950, IEC60950, ACA TS001 /AS 3260
• EMC Approvals - FCC Part 15 (Class A), EN55022 (Class B), EN 55024.
• Telecom - TBR3

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CX93010 UCM92/32bis Controllered Modem

USB Controller-based Modem with Worldwide SmartDAA®4 Line Side Device.

The Conexant UCM92 and UCM32bis modems are part of Conexant's latest range of worldwide operational modem device sets and take advantage of Conexant's 4th Generation SmartDAA® technology. Depending on model, modulations up to V.92 and including V.32bis are included. The V.92 model supports V.44 in addition to other variants supporting V.42bis/MNP 5 data compression for greater data throughput, and V.42 LAPM/MNP2-4 error correction protocol for increased data integrity and reliability. Support for 14.4kbps fax modem operation is also a feature. This modem is compatible with both USB 1.1 and 2.0 host controllers and hubs capable of sending and receiving serial data at the maximum 12Mbps rate. It is CDC-compliant being supported by Microsoft CDC modem drivers. These device sets comprise of a two chip solution consisting of a single chip modem device and a SmartDAA®4 line side device (LSD). The modem device integrates a micro controller, DSP and a SmartDAA® system side device onto a single die. Intended for serial applications the modem is available as a tiny 20-pin QFN package that is both Pb-free and RoHS compliant. For flexibility the modem will accept 28.224MHz or 27.000MHz crystal or clock input.

Conexant's patented CX20548 SmartDAA®4 architecture simplifies application design, with their proprietary DIB design both reducing cost and minimising board space required. This is achieved by eliminating the bulky analogue transformers, relays and opto-isolators typically used in discrete and line powered DAAs. Typically compared with their earlier CX20493 SmartDAA®3 the new CX20548 SmartDAA®4 offers BOM count saving of 7 discrete components and a saving of about $0.25 (monolithic pricing). The CX20548 SmartDAA®4 exceeds WW regulatory requirements to meet OEM requirements maintaining all of the earlier CX20493 features with the following changes:
Single transformer for power, clock and DIB interface.
Internally synthesised Korean ring impedance
DC coupled ring detect and CID
Long DIB operation, which means the DIB can be placed up to 10" from the DAA with no performance degradation.
with its improved EMC immunity margins the SmartDAA4® boasts 6KV surge protection.

The modem operates by executing masked code from internal ROM. Internal RAM enhances the flexibility of the modem by allowing limited upload of new country codes, overriding the existing 63 embedded country profiles and adding customised firmware code. An optional external serial EEPROM is supported, so permanent storage of new country profiles and customised firmware is facilitated. The Enhanced telephony extension features such as Caller ID and Call Waiting detection are supported and as the modem is not line powered it is not subject to variations in line voltage conditions.

Small low-profile packages, reduced voltage operation and low power consumption make this device set an ideal solution for embedded applications.

Typical applications

• V.92 modem USB adapters
• Embedded Systems
• Gaming Devices
• Remote monitoring and data collection systems

Features
• Full speed (12Mbps) USB interface device implementation
- Suspend/Resume
- Vendor specific descriptions
- Bus Powered USB device
- Compatible with USB2.0
• System Compatibility - CDC compliant systems
- Microsoft Win98SE, Win2K, WinXP, Linux operating systems
- Mackintosh computers and Sun Workstations
• Modulations and protocols
- ITU-T V.92
- Modem-on-Hold (V.92 version only)
- Quick connect (V.92 version only)
- PCM upstream (V.92 version only)
- V.90/V.34/V.32bis/V.32
- V.22bis/V.22/V.23/V.21
- V.23 reverse, V.23 half-duplex
- Bell 212A/Bell 103
- V22bis fast connect
- V.80 Synchronous Access Mode
• Data compression
- V.44/V.42bis/MNP5
• Error correction
- V.42/MNP4/MNP2
• Fax Modem send and receive rates up to 14.4kbps
• Call Waiting (CW) detection
• Type I and Type II Caller ID (CID) decoding
• Asynchronous data
• No external memory required
• 63 embedded and upgradeable country profiles
• Serial EEPROM interface for optional permanent country profile storage
• Embedded AT commands
• SmartDAA
- Extension pick up detection
- Digital line protection
- Line reversal detection
- Line-in-use detection
- Remote hang-up detection
- Worldwide compliance
• Selectable 28.224 MHz or 27.000 MHz frequency of operation
• Low power and voltage
- Single +3.3V supply with +3.3V I/O level
- Low power consumption mode

A compact, robust USB modem reference design package is available in electronic form to minimise application design time, reduce design in costs and accelerate time to market. Included in the package are full data and schematics, board layout in Gerber, bill of materials (BOM) and vendor parts list (VPL).

* Chipset consists of 20-pin QFN controller and 16-pin QFN Smart DAA

GN240206 ED190406

Socket Wireless Modules

For further information about additional socket modem solutions please visit the Wireless Section where you will find information on the Socket GSM/GPRS/EDGE modules, Socket CDMA modules and Socket Bluetooth modules. These wireless modules offer a serial connectivity solution using the same standard socket footprint as the wired socket solutions in this section.

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History of SmartDAA® evolution

• CX20434
  - first customer shipment in April 1999
  - 1.8M devices shipped
• CX20463
  - Launched end of 1999
  - Over 50M devices shipped
  - Resolved issues in CX20434
• CX20493
  - Launced end of 2001
  - Over 150M devices shipped
  - Cost reduction and improvement on CX20463
• CX20548
  - Launched Q106
  - 4th Generation SmartDAA® (SmartDAA®4)
  - Single DIB Transformer and other cost reductions over CX20493

GN140206 ED130406

XE2422 Series

The XE2422 modem provides a low power, low cost, global modem solution. There are two main types of package available for these devices. Firstly there is a PCB module that can be bought as a surface mount or through hole solution. Typically the PCB modules are best for more cost sensitive applications. When board area is at a premium in the host application an excellent choice would be to use the HyPLCC packaged modem. However, in reality both packages are very compact which makes it easier for the designer to layout the circuit board due to the efficient usage of PCB real estate.

Features:

• Data transfer at rates from 300 bps to 2400bps
• Control and configuration via AT commands
• 3.3 and 5V compatible serial interface
• V.42 error control and V.42bis data compression
• Shared line features prevent modem operation from interfering with voice communications
• Boot command automatically loads user default configuration
• Complete integrated DAA
• World wide telephone networks compliance
• Low power operation, 3.3V, 100mW

A further advantage of using this device is that once it is designed in it can be swapped for two other compatible parts that may suit certain applications better. For applications where a higher data rate is required the user can substitute the XE2422 with either XE5690 or the XE5692 (providing the same package type is used). Both of these devices provide data rates up to 56kbps but the XE5690 is a V.90 modem while the XE5692 is a V.92 modem.

DS010306 ED190406

RJModem™

The MultiTech RJModem™ is the first of its kind, a communication ready fully featured modem module, integrating controller, datapump and Smart DAA, filtering and RJ-11 into a single compact device. This concept allows designers and manufacturers to integrate dial-up connectivity with global communication capability into any product design with a minimal of engineering effort. With the complex DAA arrangements all taken care of internally, engineers can concentrate their efforts on other core features of their design thus enabling a much quicker time to market scenario.

This ready to deploy modem interfaces easily and directly to a UART or microcontroller through a standard serial DTE communication channel with connection to the module itself via 14 pins on its underside which seat directly down on your board. The integrated RJ-11 jack provides a direct connection to the public switched telephone network. There are three speed variants, ranging from low speed V.22bis through V.34bis to a fully featured V.92 solution which includes Modem on Hold, PCM upstream and V.44 data compression. The higher speed modems are backward compatible with the slower modems. Standard Hayes AT command structure is used to control the modem and all the usual features common in modem technology are supported such as V.42 Error correction and V.42bis data compression. FastPOS (V.29) and V.22bis Fast Connect seen mostly in Point of Sale applications are also an important feature of the specification. Telecoms approvals, an expensive but necessary evil, is much simplified with this module, having already been put through the process of international compliance testing (homologation). This means that one module can be specified per design without having to integrate specific country approved modules for each system used across the world. The module is available in both a 5V and a 3.3V low power variant and boasts an impressive -40 to +85°C operating environment temperature range.

A development kit is available which provides the capability to plug in the modem and use it for testing, programming and evaluation. The kit includes one development board with RS232 DB-25 connector, universal PSU, connector for attaching the RJModem™, RS-232 cable and developer guide CD.

Specification/Features:

• Complete data modem including the controller, datapump, DAA and RJ-11
• ITU-T V.92/V.90/56K, V.34/33.6K, V.32bis/14.4K, V.22, V.23 & V.21, Bell 212A & Bell 103
• Telecom approved in more than 50 countries (some pending)
• V.42 LAPM, MNP 2-4 Error Correction
• V.44, V.42bis & MNP Class 5 data compression
• Intelligent DAA technology detects line status
• AT command interface
• US caller ID reporting
• Low power sleep mode
• FastPOS (V.29) and V.22bis Fast Connect
• V.80 Synchronous Access
• 10 or 11-bit modes
• 3.3 or 5V power input options
• Operating environment temperature range: -40 to +85°C
• Power consumption:
• 5V build option, typical 66mA, maximum 75mA
• 3.3V build option, typical 95mA, maximum105mA
• Two year warranty
  

Dimensions:

Certifications:

UL60950-1, IEC60950-1, ACA TS001/AS3260, CCC

EMC: FCC CFR47 part 15 (Class B), ICES-003 Canada (Class B), EN 55022 (Class B) & EN55024

For those applications where space directly on the board is at a premium or the main comms board is not near enough to an external panel on the casing to get access to the RJ-11 connector MultiTech offer a remote mounting kit to enable the modem to be mounted off the main board and a cable can be run to the serial interface on the main board.

GN261005 ED180406

MTXCSEM Ethernet-IP SocketModem®

MultiTech's MTXCSEM Ethernet-IP SocketModem® enables connection of serial devices to an IP network. An integrated high performance 10/100BaseT Ethernet Bridge and a complete TCP/IP stack on the module will very simply make your existing and next generation devices, machines or systems IP-ready, whilst allowing you to concentrate on developing other key features of your design. This ready-to-integrate, RoHS compliant, embedded module is based around MultiTech's space-efficient universal socket architecture. It offers the range of SocketModem® products a complete, low cost, Ethernet IP network enabled solution.

If you are looking for a modular serial to Ethernet-IP solution suitable for remote monitoring, control and system configuration applications then the MTXCSEM® is ideal with its 150MHz ARM9 based Network Processor, MAC, physical interface TCP/IP stack and web server all integrated. The module can be interfaced directly to a UART or microcontroller, is capable of auto-sensing 10/100BaseT and the serial DTE channel is capable of transfer speeds up to 230.4Kbps. The onboard processor supports ARP, Bridging, DHCP, DNS, HTTP, ICMP, IP, POP3, SNMP, SMTP, SNTP, TCP, FTP, Telnet, TFTP & UDP protocols. The MTXCSEM® device server supports remote configuration, therefore central site setup and remote configuration of the modules is possible via the command line interface or telnet.

MTXCSEM Ethernet-IP SocketModem® is RoHs compliant and utilises MultiTech's Universal Socket, a flexible comm-port architecture which also provides analogue dial-up, ISDN, GSM/GPRS, EDGE or Bluetooth connectivity with interchangeable modules. A developer kit is available that includes a development board with RS232 DB-25 connector, MTXCSEM Ethernet-IP SocketModem®, universal PSU, Developer Kit CD, RJ-45 Jack and RS232 cable.

The Socket Ethernet IP device server is ideal for applications including: ATM terminals, credit card verification systems, data collection, gas pumps, industrial and medical remote monitoring systems, POS systems, remote diagnostics, security systems, ticketing machines and vending machines.

Specification/Features

Complete Serial to Ethernet connectivity solution including 150MHz ARM9 based Network Processor, MAC, physical interface

Interfaces: 10/100BaseT Ethernet, Asynchronous Serial supporting DTE speeds to 230Kbps

High performance 10/100BaseT Ethernet Bridge

High performance processor runs ARP, Bridging, DHCP, DNS, HTTP, ICMP, IP, POP3, SNMP, SMTP, SNTP, TCP, FTP, Telnet, TFTP & UDP protocols.

10/100BaseT auto-sensing Ethernet or configurable for 10MB, 100MB, half-duplex or full-duplex.

256 frame buffer

Stores 10,000 MAC addresses.

Auto learning of MAC addresses.

Command line interface

Space-efficient universal socket connectivity

LED driver outputs for visual monitoring of speed, link, activity, collision and duplex mode.

Central site setup and control of the remote modules

Isolated Ethernet configurations available (-HV)

Developers kit available.

2 year Warranty.

Power requirements

5VDC or 3.3VDC

Typical: 270mA @ 5V or 260mA @ 3.3V

Maximum: 310mA @ 5V or 300mA @ 3.3V

Processor: 150MHz ARM 9

Memory: 8 meg RAM; 2 meg Flash (for firmware updates)

Dimensions

2.7 x 6.5 x 1.8cm (1.045" x 2.541" x 0.680")

Operating temperature

0°C to +70°C

Approvals

Safety Certifications - UL60950, EN60950, CSA950, AS 3260.

EMC Approvals - FCC Part 15 (Class B), Canadian (Class B), EN55022 (Class B), EN 55024.

XE5690 Series

The XE5690 modem provides a low power, low cost, global V.90 modem solution. There are two main types of package available for these devices. Firstly there is a PCB module that can be bought as a surface mount or through hole solution. Typically the PCB modules are best for more cost sensitive applications. When board area is at a premium in the host application an excellent choice would be to use the HyPLCC packaged modem. However, in reality both packages are very compact which makes it easier for the designer to layout the circuit board due to the efficient usage of PCB real estate.

Features:

• Data transfer at rates from 300 bps to 56kbps
• Control and configuration via AT commands
• 3.3 and 5V compatible serial interface
• V.42 error control and V.42bis data compression
• Shared line features prevent modem operation from interfering with voice communications
• Boot command automatically loads user default configuration
• Complete integrated DAA
• World wide telephone networks compliance
• Low power operation, 3.3V, 100mW

A further advantage of using this device is that once it is designed in it can be swapped for two other compatible parts (of the same package type) that may suit certain applications better. The XE2422 provides low speed connectivity at a low cost. This is ideal where small amounts of data need to be transferred quickly. A typical example of this would be in POS terminals. The other drop in part is the XE5692 for high speed V.92 connections. This modem will be suited more to transferring larger quantities of data. An example of this might be the downloading of information from a data logger.

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SCXV.22bis Modem

Controller-based 2400 bps Modem with Worldwide SmartDAA®3 Line Side Device for Embedded Applications

The SCXV.22bis modem device is a simplified design in a small form-factor, that allows for quick time-to-market. The SCXV.22bis modem supports worldwide DAA and data modes up to 2400bps. This low cost solution integrates microcontroller (MCU), serial host interface, ROM, RAM and SmartDAA system side device (SSD) functions onto a single die.

The Conexant SCXV.22 bis modems are worldwide operational modem device sets for embedded applications that support modulations up to V.22bis. The modems support V.42bis data compression to maximise data throughput, and V.42 LAPM/MNP2-4 error correction protocol for increased data integrity and reliability. These device sets comprise of a two chip solution consisting of a single chip modem device and a SmartDAA®3 line side device (LSD). The modem device integrates a microcontroller, DSP and a SmartDAA® system side device onto a single die. Suitable for serial applications only, the SCXV.22bis modem is avaliable as a 28-pin TSSOP that is pin and footprint compatible with Conexant's SCXV.92/34/32 modems. Parallel interface is not supported on the SCXV.22bis so try using the 38-pin TSSOP version of the SCXV.92/34/32 sister chip.

Conexant's patented SmartDAA® architecture simplifies application design, with their proprietary DIB design both reducing cost and minimising board space required. This is achieved by eliminating the bulky analogue transformers, relays and opto-isolators typically used in discrete and line powered DAAs. Enhanced telephony extension features such as Caller ID and Call Waiting detection are supported and as the modem is not line powered it is not subject to variations in line voltage conditions.

The modem operates by executing masked code from internal ROM. Internal RAM enhances the flexibility of the modem by allowing limited upload of new country codes, overriding existing country profiles and adding customised firmware code.

Small low-profile packages, reduced voltage operation and low power consumption make this device set an ideal solution for embedded applications.

Applications include:
Set top boxes
POS terminals
ATM machines
Minitel terminals

Features
• Modulations and protocols
- V.22bis/V.22/V.23/V.21
- V.23 reverse, V.23 half-duplex
- Bell 212A (1200 bps)
- V22bis fast connect
- V.80 Synchronous Access Mode
• Data compression
- V.42bis
• Error correction
- V.42 LAPM/MNP2-MNP-4
• Call Waiting (CW) detection
• Type I and Type II Caller ID (CWID) decoding
• Serial DTE/host interface
• Synchronous Data Mode
- Asynchronous data mode (normal and direct)
• No external memory required
• Embedded and upgradeable country profiles
• Embedded AT commands
• SmartDAA
- System side powered DAA operates under poor line current supply conditions
- Extension pick up detection
- Digital line protection
- Line polarity reversal detection
- Line-in-use detection
- Remote hang-up detection
- Meets Worldwide DC VI mask requirements
• 28.224 MHz frequency of operation
• Low power and voltage
- Single +3.3V supply
- Low power consumption mode
- +3.3V I/O level
• Compact, robust board design
- Small, low-profile modem packages
- SmartDAA and DIB technologies
- Reference design supports 5KV isolation

An RS232 external data modem reference design package is available in electronic form to minimise application design time, reduce design in costs and accelerate time to market. Included in the package are full data and schematics, board layout in Gerber, bill of materials (BOM) and vendor parts list (VPL).

* Chipset comprises of CX84100-23 modem controller in 28-pin TSSOP and CX20493-31 Smart DAA in 28-pin QFN
** Chipset comprises of CX84100-23 modem controller in 28-pin TSSOP and CX20493-35 Smart DAA in 32-pin LQFP

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XE5692 Series

The XE5692 modem provides a low power, low cost, global V.92 modem solution. There are two main types of package available for these devices. Firstly there is a PCB module that can be bought as a surface mount or through hole solution. Typically the PCB modules are best for more cost sensitive applications. When board area is at a premium in the host application an excellent choice would be to use the HyPLCC packaged modem. However, in reality both packages are very compact which makes it easier for the designer to layout the circuit board due to the efficient usage of PCB real estate.

Features:

• Data transfer at rates from 300 bps to 56kbps
• Control and configuration via AT commands
• 3.3 and 5V compatible serial interface
• V.42 error control and V.42bis data compression
• Shared line features prevent modem operation from interfering with voice communications
• Boot command automatically loads user default configuration
• Complete integrated DAA
• World wide telephone networks compliance
• Low power operation, 3.3V, 100mW

A further advantage of using this device is that once it is designed in it can be swapped for two other compatible parts (of the same package type) that may suit certain applications better. The XE2422 provides low speed connectivity at a low cost. This is ideal where small amounts of data need to be transferred quickly. A typical example of this would be in POS terminals. The other drop in part is the XE5690 for high speed V.90 connections. This modem would be used in a similar role to the XE5692 but is a little cheaper. The trade off with using this modem is that connection times are likely to be longer than with a V.92 device.

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The Conexant SMXXD Modem is an alternative to the Conexant Smart DAA® modems in this section, although similarly based on a single chip this modem integrates the microcontroller, digital signal processor, memory and analogue line interface codec functions into a single package that supports a discrete DAA design. It is ideal for country-specific embedded applications such as POS Terminals, Set-top Boxes, Metering, Building Automation, Gaming, Ruggedised Notebooks, Remote Site Management and any other application that requires a robust dial-up modem solution. As with all the Conexant Smart modems, it operates by executing firmware from internal ROM and RAM. Optional customised firmware is supported with optional external flash ROM. Country support is provided for 29 countries in the embedded ROM, however additional or modified country profiles can be added by internal SRAM patch (max of one profile) or by serial EEPROM. The V.92 model supports V.44 in addition to other variants supporting V.42bis/MNP 5 data compression for greater data throughput, and V.42 LAPM/MNP2-4 error correction protocol for increased data integrity and reliability.

The SMXXD supports either serial DTE or parallel host interface by selection of the PARIF input high or low. SMxxD offers low power operation and with its low profile 144-pin TQFP package it is ideal for embedded applications. The SMXXD Modem features data/fax/Telephone Answering Machine (TAM) and up to 56 kbps analogue data modem operation with Group 3 send and receive 14.4 kbps fax modem operation. The V.92 modem includes Quick Connect, Modem-on-Hold™ and PCM Upstream. The SMXXD is also available in V.34 or V.32bis options. As with all Conexant modem chipsets a reference design board and board support package is available that includes schematics, bill of materials, vendor parts list, board layout files in Gerber format and full documentation.

Features
• Modulations
- ITU-T V.92, V.90 (SM56D models)
- ITU-T V.34 (SM56D/SM336D)
- ITU-T V.32bis, V.32, V.22bis, V.22 fast connect, V.23 and V.21
- Bell 212A and Bell 103
- V.250 and V.251 commands
- V.80 synchronous access mode
• V.92, V.34 and V.32bis options
- V.92 includes Modem-on-Hold™, Quick Connect and PCM Upstream
• FastPOS (V.29) and V.22 fast connect

• V.44/V.42bis and MNP5 data compression
• V.42 LAPM and MNP2-4 error correction

• Built-in host/DTE interface

- Parallel 16550A UART interface up to 230.4 kbps

- Serial ITU-T V.24 logical interface up to 115.2 kbps

• Serial async/sync data; parallel async data

• Interfaces to optional external ROM/flash ROM, RAM and/or serial EEPROM

• TAM and optional full-duplex speakerphone using CX20441 voice codec
• On-hook and/or off-hook Caller ID detection
• 144-pin TQFP package
• Fax modem send and receive rates up to 14.4 kbps
• Low power 191mW (normal); 53mW (sleep)

• +3.3V operation with +5V tolerant digital inputs
• Low-cost solution
• Pb-free devices

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SCXV.92/V.34/V.32bis Modem

Controller-based Modem with Worldwide SmartDAA®3 Line Side Device for Embedded Applications

The Conexant SCXV.92, SCXV.34, and SCXV.32bis modems are worldwide operational modem device sets for embedded applications that support modulations up to V.92, V.34, and V.32bis, respectively. The V.92 model supports V.44 in addition to other variants supporting V.42bis/MNP 5 data compression for greater data throughput, and V.42 LAPM/MNP2-4 error correction protocol for increased data integrity and reliability. These device sets comprise of a two chip solution consisting of a single chip modem device and a SmartDAA®3 line side device (LSD). The modem device integrates a microcontroller, DSP and a SmartDAA® system side device onto a single die. For serial applications the modem is available as a 28-pin TSSOP that is pin and footprint compatible with Conexant's SCXV.22bis low speed modem. If you require parallel interface then the SCXV.xx is available as a 38-pin TSSOP and indeed this variant will also support selecting serial interface by pulling the PARIF pin high or low.

Conexant's patented SmartDAA® architecture simplifies application design, with their proprietary DIB design both reducing cost and minimising board space required. This is achieved by eliminating the bulky analogue transformers, relays and opto-isolators typically used in discrete and line powered DAAs. Enhanced telephony extension features such as Caller ID and Call Waiting detection are supported and as the modem is not line powered it is not subject to variations in line voltage conditions.

The modem operates by executing masked code from internal ROM. Internal RAM enhances the flexibility of the modem by allowing limited upload of new country codes, overriding existing country profiles and adding customised firmware code. The 38-pin version supports optional external NVRAM, so permanent storage of new country profiles and customised firmware is facilitated.

Small low-profile packages, reduced voltage operation and low power consumption make this device set an ideal solution for embedded applications.

Typical applications

• Set top boxes
• POS terminals
• ATM machines
• Metering terminals
• Video game consoles
• Internet appliances

Features
• Modulations and protocols
- ITU-T V.92
- Modem-on-Hold ( V.92 version only)
- Quick connect (V.92 version only)
- PCM upstream (V.92 version only)
- V.90/V.34/V.32bis/V.32
- V.22bis/V.22/V.23/V.21
- V.23 reverse, V.23 half-duplex
- Bell 212A/Bell 103
- V.29 Fast POS
- V22bis fast connect
- V.80 Synchronous Access Mode
• Data compression
- V.44/V.42bis/MNP5
• Error correction
- V.42/MNP 4/MNP 2
• Call Waiting (CW) detection
• Type I and Type II Caller ID (CID) decoding
• DTE/host interface
- Serial DTE interface
- Parallel 16550 UART compatible host interface (38-pin version)
- Direct Mode
- Synchronous Mode
- Asynchronous Mode
• No external memory required
• Embedded and upgradeable country profiles
• Serial NVRAM interface for optional permanent country profile storage (38-pin version)
• Embedded AT commands
• Full-duplex 8-bit/14-bit PCM voice pass-through mode
• SmartDAA
- Extension pick up detection
- Digital line protection
- Line reversal detection
- Line-in-use detection
- Remote hang-up detection
- Worldwide compliance
• Selectable 28.224 MHz or 27.000 MHz frequency of operation
• Low power and voltage
- Single +3.3V supply
- Low power consumption mode
- +3.3V I/O level
• Compact, robust board design
- Small, low-profile modem packages
- SmartDAA and DIB technologies
- Reference design supports 5KV isolation

An RS232 external data modem reference design package is available in electronic form to minimise application design time, reduce design in costs and accelerate time to market. Included in the package are full data and schematics, board layout in Gerber, bill of materials (BOM) and vendor parts list (VPL).

* Chipset consists of 28-pin TSSOP controller and 28-pin QFN Smart DAA (or 32-pin LQFP )
** Chipset consists of 38-pin TSSOP controller and 28-pin TSSOP Smart DAA (or 32-pin LQFP)

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MT2456SMI-22 SocketModem®

MultiTech's MT2456SMI-22 SocketModem® module is a single-port serial, V.22bis analogue data modem that is targeted for low data rate applications. This ready-to-integrate, RoHs compliant, embedded module is based around MultiTech's space-efficient universal socket architecture. It offers the range of SocketModem® products a complete low cost, low speed serial data modem solution with V.42bis data compression, V.80 synchronous access mode and V.22bis Fast Connect capability making it an ideal choice for applications such as POS and payment terminals. The industry standard AT command interface make for easy implementation communicating with the host processor via an asynchronous serial interface.

This pre-qualified and homologated module is Telecom approved in over 50 countries making it a truly global solution. The MT2456SMI-22 SocketModem® has an onboard controller, DSP and DAA in a complete ready-to-integrate space efficient (2.7 x 6.5cm) module. The module takes advantage of industry standard V.42bis data compression and V.42 (LAP-M or MNP 2-4) error correction for a very secure, robust solution. It has a wide operating temperature range of 0°C to +70°C . Many useful features are included such as auto dial, redial, pulse or dial tone, auto answer, adaptive line probing, automatic symbol and carrier frequency during start up, retrain and rate negotiations. The serial DTE channel can be interfaced directly to a UART or micro controller and is capable of transfer speeds up to 115200bps. The module is capable of being configured remotely or directly through the UART via a command mode. For maximum flexibility the MT2456SMI-22 SocketModem® is configurable from speeds as low as 300bps through to 115Kbps.

MT2456SMI-22 SocketModem® is RoHs compliant and utilises MultiTech's Universal Socket, a flexible comm-port architecture which also provides analogue dial-up, ISDN, GSM/GPRS, EDGE, Bluetooth or ethernet connectivity with interchangeable modules. A developer kit is available that includes a development board, MT2456SMI-22 SocketModem®, RS232 DB-25 connector, universal PSU, Developer CD, RS232 cable and RJ11 jack.

Specification/Features

• Client-to-Server data rate: V.22bis
• Client-to-Client data rate: 2400, 1200, 0-300bps
• Data format: Serial, asynchronous
• Modem compatibility: V.22bis, V.22; Bell212A and 103/113; ITU-T V.21 & V.23
• Error correction: ITU-T V.42 (LAP-M or MNP 2-4)
• Data compression: ITU-T V.42bis
• Speed conversion: Serial port data rates adjustable to 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600, and 115200
• Modes of operation: Full Duplex over dial-up lines, data mode, command mode and online command mode
• Flow control: XON/XOFF (software), RTS/CTS (hardware)
• Command buffer: 50 characters
• Interface: Serial ITU-T V.24 logical interface
• Ringer Equivalence (REN): 0.4B
• Diagnostics: local analogue loop
• Weight: 0.02Kg (0.04lb)
• Dimensions: 2.7 x 6.5 x 1.8cm (1.045" x 2.541" x 0.680")
• Operating temperature: 0°C to +70°C
• Operating Voltage: 3.3V ±5% or 5VDC ±5% variants

Power consumption

• 3.3Volt: Typical 60mA (.235W @ 3.3VDC), Maximum 70mA (.264W @ 3.6VDC)
• 5Volt: Typical 60mA (.300W @ 3.3VDC), Maximum 70mA

Dimensions

• Dimensions: 2.7 x 6.5 x 1.8cm (1.045" x 2.541" x 0.680")

Approvals

• Safety Certifications - UL60950, cUL60950, EN60950, IEC60950, ACA TS001 / AS3260
• EMC Approvals - FCC Part 15 (Class B), Canadian EMC (Class B), EN55022 (Class B), EN 55024

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* SMxxD uses either Parallel or Serial interface which can be selected by setting the PARIF input high or low therefore uses same chipset as for Serial
** Also available in 32pin LQFP
† Speakerphone capability - chipset includes additional CX20442-31 Voice codec in 32pin TQFP (Pb-free)
††Speakerphone capability - chipset includes additional New CX20452-A Voice codec in 32pin TQFP (not Pb-free)

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The Conexant CX86810 DFX214/DFX209 Fax Modem family offers synchronous Group 3 facsimile send and receive speeds up to 14,400 bps. The CX86810 is housed in a 100-pin low profile quad flat package (LQFP) and is pin-compatible within the product family.

Features
• V.17 (14.4 Kbps) and V.29 (9.6 Kbps) fax options
• Discrete DAA
• Supports Type I and Type II Caller ID and V.23 full duplex
• Optional support for Russian Caller ID

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The Conexant CX86720 DFX336/314 High Performance Fax Modem family offers ITU-T V.34 half-duplex mode operation, as well as synchronous Group 3 facsimile send and receive speeds up to 33,600 bps. The CX86720 operates on low voltage and is housed in a 100-pin low profile quad flat package (LQFP).

Features
• Discrete DAA
• V.34 / V.17 fax options
• Worldwide compliant handset support through external Codec

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The Conexant CX86710 SFX336/314 High Performance Fax Modem family with SmartDAA technology offers ITU-T V.34 half-duplex mode operation, as well as synchronous Group 3 facsimile send and receive speeds up to 33,600 bps. The CX86710 is a 2nd generation Smart Fax Modem which offers improved performance, additional features, and optimized cost. The SFX336/314 device set consists of two devices:
• CX86710 Host Side Device (HSD) with integrated modem DSP and SmartDAA System Side Device (SSD) in a 64-pin TQFP package
• CX20493 SmartDAA 3 Line Side Device (LSD) in a 28-pin QFN package
An optional CX20452 Codec in a 24-pin LQFP is available for external handset support.

Features
• Industry leading SmartDAA technology
• Option for embedded API for SmartDAA control
• V.34 / V.17 fax options
• Worldwide compliant handset support through external Codec
• 3.3V operation

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The CX20493 SmartDAA. 3 is based on Conexant's patented Digital Isolation Barrier (DIB) technology which provides an error-free and reliable digital communication channel, that eliminates the need for costly analogue transformers, relays, and opto-isolators that are typically used in discrete DAA implementations. Conexant's SmartDAA 3 technology is incorporated into a variety of the company's application specific products enabling users to send and receive data across the PSTN via modem, fax, set-top box or embedded appliances.

Features
• Digital PBX protection
• Software programmable international DC loop control and ring voltage threshold leads
• Greater immunity to common mode noise
• Guaranteed operation over longer lines
• 28-pin QFN

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The Conexant CX86820 DFX2xx-Vx facsimile modem family offers 14400 bps and 9600 bps half-duplex fax capability with options for supporting Digital Telephone Answering Machine (DTAM) (-V option), full-duplex speakerphone (-S option), and Russian Caller ID (/C option). It also supports V.23, Type I and Type II Caller ID and Short Messaging Service (SMS). The CX86820 functionality is supplied in a single device containing a DSP, a Primary Integrated Analogue (PIA) codec, and an optional Secondary Integrated Analogue (SIA) codec (-S option). The CX86820 modem is packaged in a 100-pin LQFP. The CX86820 family is also pin-compatible with the CX86810 (DFX2xx) family, which enables single PCB design for wide range of fax enabled terminals.

Features
• Group 3 facsimile transmission/reception
• Telephone Answering Machine (-V Option)
• Full-Duplex Speakerphone (-S Option)
• Russian Caller ID detection (/C Option)
• Short Messaging Service

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Smart DAA vs Conventional DAA

Tech Tip: Universal Socket Configuration

The SocketModem® architecture is designed such that it provides system developers with socket module solutions that provide a universal location for each function pin, thus a common development board can be used for each flavour of Socket modem connectivity, whether it be PSTN modem, ISDN, GSM/GPRS, CDMA, Ethernet or Bluetooth. Below is a diagram of the Universal Socket which shows all the available pin locations. I have shaded the active pins required for the MTXCSEM EthernetIP as an example. There is however an exception: the RX+ and RX- pins are reversed on the MTXCSEM EthernetIP socket and the MT128SMI ISDN socket. So when designing with both these sockets on the same system please remember that:

Pin 6 is RX- for the MTXCSEM EthernetIP. For the MT128SMI ISDN, Pin 6 is RX+.

Pin 7 is RX+ for the MTXCSEM EthernetIP. For the MT128SMI ISDN, Pin 7 is RX-.

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Why V.92 and what is V.92?

Whilst broadband (DSL and Cable) is all the rage right now, in reality many people still only have access to relatively slow dial-up Internet connection via their analogue phone line, hence V.92 is a reasonably recently introduced dial-up modem specification from the ITU that introduces three new features:

Quick Connect - giving up to 40% faster connections by reducing modem handshake time.

Modem on Hold (MOH) - allows user to stay connected to the Internet while taking an incoming voice call, or place a call while on the Internet.

PCM upstream - increases capability of upstream data rate from 24Kbps to 48kbps, this will benefit users who send emails with attached files, photos etc.

Add to this the latest V.44 compression scheme which compresses HTML text for faster web downloads giving 30-40% faster throughput on average and you have a vastly improved dial-up internet experience.

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Technology

A modem is a peripheral device for transmitting and receiving data across 2-wire PSTN networks or leased lines. Most commonly associated with personal computers, they are also used in embedded applications. So how do they work?

The word "modem" stands for "modulator-demodulator". Basically its purpose is to convert digital information into analogue signals (this is called modulation), and to convert analogue signals into useful digital information (this is called demodulation).

Before transmitting bits directly across telephone lines, modems convert the bits into analogue sound waves. A carrier signal is constantly transmitted by the modem and it is this carrier signal that "carries" the information from one place to another. Information is transmitted by the modem by modulating this carrier signal. The carrier signal is characterised by the number of pulses transmitted per second. Each pulse is called a baud.

See also tech tip on Bits and Bauds

So, a signal with an amplitude or signal strength of say 1 may represent a binary 0 and this signal may have a period of T. If the same signal were to be modulated over the same time period T, so that the amplitude were say 2 then it may represent a binary 1. Phase shift keying is a technique used to shift the period (T) of a wave relative to the wave that came before, so a given wave that starts at 0 can be phase shifted so that its period (T) starts at its highest point which may be 1. In doing this the wave has been shifted one quarter of the wave's full period. This can be repeated again so that the wave shifts by half its period and then again so it is shifted by three quarters of its period. The result is that you end up with four separate waves that can each represent a binary value ie: 00, 01, 10, 11.

Quadrature Amplitude Modulation or QAM is an often used technique to increase the number of bps throughput. Basically it combines Phase Shift Keying and Amplitude Modulation so for example by using say two measures of amplitude, 1 and 2, and combining that with 4 phase shifts you can potentially send 8 possible waves. The number of different levels of amplitude and phase shift can be be increased so that speeds of say 28.8kbps which uses 24 bits per baud can be supported.

Of course data can become corrupted during transmission and this is one of the biggest problems with modems and communications over the PSTN. The receiver needs to know if there is corruption in the signal when received so it can request re-transmission of the data if necessary. Parity checking is the simplest way to to this by sticking an extra bit at the end of each signal. For odd parity the total number of bits with a value of "1" in a signal including the parity bit, must be an odd number. For even parity the opposite applies, the total number of "1" bits in a signal must be even, ie; when using even parity, if a given signal is 0110 then the parity bit will be zero because there are two "1" bits, however if the signal was 0111 then the parity bit would need to be a "1" making a total number of "1" bits 4. If the receiving modem determines that any signal has odd parity then it will ask for the signal to be retransmitted. There are other more complex methods of checking and correcting errors, read about them in the Tech Tips.

Converting back to digital is simply the reverse of this process. The signal is received by the modem, the amplitude and phase shift of each wave is analysed and the bits generated accordingly.

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Chipset or Module?

Figure 1 can be used to simplify the process of selecting a modem for your application. The figure shows the popular parts in the range but it is not exhaustive. Please contact the office if you need assistance choosing your modem or if the device type does not appear on the chart. The decision between modules and chipsets is based upon a cost argument that will vary between companies and the figures provided are for your guidance only and are not underwritten by TDC. The following table will help you to calculate the volume at which point a chipset becomes financially viable.

Please note the following points that may influence your choice before using the chart.
- It is often more cost effective to use a modem module such as a SocketModem or an RJ Modem because the product is complete.
- Modem modules significantly reduce development time by greatly simplifying the PCB design.
- Modem modules are already approved for use in many countries and the test reports are available to you.
- Modem modules reduce the component BOM management and provide a pre-tested component permitting the designer to avoid the need to become a modem expert.
- Designing with modem chipsets is straightforward since reference design information is available and includes the schematic diagrams, Gerbers, BOM and sometimes a vendor parts list.
- The firmware provided for the chipset design is stable and has undergone many thousands of tests and approvals. It is highly configurable providing all of the features that you would expect from a professional solution from Conexant, the world leader in dial-up modems. Conexant have sold and continue to sell more analogue modem devices than any other company.
- All of the firmware included in the Conexant and MultiTech products is free of charge and free of royalties. Additionally, there are no payments required to third parties for non-inclusive patents.
- Conexant silicon is fully supported by TDC who can assist with implementation problems.
- A Conexant chipset design results in a minimal component count product that is easy to manufacture and offers modem performance that is second to none. A chipset design will always produce the lowest cost solution for volume applications such as Set Top Boxes.
- Conexant's 'Smart DAA' line interface provides an international modem solution and no longer requires the designer to be an expert in Data Access Arrangements (DAAs).

Figure 1

Example 1 of a Modem design
Let’s assume that you need a modem that operates at 33,600Bps with a serial interface and needs a 3 volt power supply. The modem is being used in a Point of Sale product that requires a higher speed capability to allow the day's transactions to be uploaded overnight. The company that will buy the product are predicting volumes of 40-60K units per annum. The core competence of the design house is in terminal hardware and software and they are not modem experts.

Let’s take a look at our Chart:
- The volume tells us that we are going down the chipset route
- It is not a PC modem so we will use the 'Embedded Route'
- The lack of modem expertise tells us that Smart DAA technology is needed so we are taken to the CX93011, CX90240, CX86500 or the CX84100. The CX90240 and CX84100 are V.22bis modems leaving us with the CX93011 and CX86500 range of devices
- Obtain for example the Conexant CX86500 device set data sheet and select the V.34 part (33,600bps) with a serial interface and a 3volt power supply. You will see that this part is DSCX-V34LF-026 and is the device set number that includes the Controller/DSP and the Smart DAA device. Conexant modem devices are lead free.

Example 2 of a Modem Design
The modem we want to introduce here is a V.92 modem for an Internet Access Device (IAD). The product has been designed for a special application in the UK market and is required to operate with a 5v power supply and parallel interface. Volumes are likely to be 4000 pcs per annum.

What does the Chart say?
- The volume tells us that a module is recommended
- We are told that we should use a SocketModem
- The parallel, V.92 5v socket modem is the MT5600SMI-P-92
- Refer to The MultiTech MT5600 series Developers guide for further information

GN200406

The Conexant CX20452 Codec is an Integrated Analogue (IA) circuit providing modem digital-to-analogue and analogue-to-digital conversion. It is packaged in a 24-pin QFN. The CX20452 Codec can serve as a line interface device between a Conexant Modem Data Pump (MDP) and the PSTN. It can also serve as a voice interface between the MDP and a microphone and speaker. The MDP communicates with the CX20452 Codec via a serial interface.

Features
• Delta-sigma ADC/DAC with dynamic range >70 dB
• Line input and output for a 600 PSTN interface
• Single-ended speaker driver capable of a 150 load
• Differential line driver capable of a 600 load
• Single-ended microphone input with internal gain and filtering
• Analogue and digital filtering in both directions
• Input/output mode selection and control
• Digital power supply (VDD) and analogue power supply (AVDD) voltage
• VDD and AVDD: 3.3 V
• 24-pin QFN

VB200106 ED180406

Tech Tip: Caller ID

Note that there are distinct differences between the US and UK caller ID services provided by the telephone networks.
In the US, the data is sent after the first ring tone and uses the 1200 baud Bell 202 tone modulation. The data may be sent in Single Data Message Format (SDMF) which includes the date, time and number or in Multiple Data Message Format (MDMF) which adds a name field.

British Telecom have developed their own standard, which wakes up the display with a line reversal, then sends the data as CCITT V23 modem tones in a format similar to MDMF. Details are to be found in Supplier Information Notes (SINs) 227 and 242, available at www.sinet.bt.com.

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SocketModem® Development Boards

In some cases you may wish to implement different connectivity options to your application. This would in most cases require different board configurations to fit say an Ethernet solution or GSM/GPRS modem instead if a dial-up modem. Chipset design may involve purchasing multiple reference design or development boards which can be a costly and time consuming exercise and will increase your BOM or VPL when you move to productionise the design with multiple board build options. One way around this is to opt for a MultiTech SocketModem® based design, the basis of which is to have a single sytem design that allows OEMs to populate it with a wide range of connectivity technologies using industry standard AT command driven, communication-ready SocketModem® modules.

This is where the benefits of using MultiTech's flexible com-port architecture will come into its own. The space efficient 2.7 x 6.5cm Universal Socket provides analogue dial-up, ISDN, GSM/GPRS, EDGE, Bluetooth or ethernet connectivity with interchangeable modules.

To simplfy the design process MultiTech have devised a range of developer kits that use the same common board and socket but use different socket population options. Each development board has RS-232 DB-25 connector and comes with a Socket Module of your choice, a universal PSU, documentation on CD, and an RS-232 cable. Wireless development boards also include the appropriate antenna to suit the module choice. The table below will allow help you select the appropriate development board package for the module you choose.

The SocketModem development boards also accomodate the Unique Multitech RJModem.

Development boards are provided free of charge when you register your project with TDC.

GN18012006 ED180406

MT56xxSMI series SocketModem®

MultiTech's MT5600SMI series SocketModem® modules are a single-port serial or parallel analogue data solution for dial-up pstn modem functionality. Whilst the MT5600SMI and MT5634SMI are data/fax only, customers with a requirement for full duplex speakerphone capability can design with the latest MT5656SMI variant. This ready-to-integrate, RoHs compliant, embedded module is based around MultiTech's space-efficient universal socket architecture. The MT56xx series coupled with the MT2456SMI-22 represents the core of the range of SocketModem® products by bringing a ready-to-integrate solution for V.22bis and V.32bis through to V.92 data, fax and voice connectivity to your embedded product without you embarking on a costly design cycle.

These pre-qualified and homologated modules are Telecom approved in over 50 countries making them a truly global solution. Both the MT5600SMI and MT5656SMI SocketModem® are based on Conexant's patented Single Chip Modem and Smart DAA technology, whilst the MT5634SMI sports an Agere chipset adding 2-wire leased line capability and extended temperature range to its capabilities. All three variants have onboard modem controller, datapump and DAA supporting V.32bis, V.34 and V.92 in a complete ready-to-integrate space efficient (2.7 x 6.5cm) module. Both the Conexant and Agere based MT56xxSMI SocketModem® solutions take advantage of industry standard V.42bis data compression and V.42 (LAP-M or MNP 2-4) error correction for a very secure, robust modem product. They have a wide operating temperature range of 0°C to +70°C and -40 to +85°C for industrial build options (available on some models). The module is capable of being configured remotely or directly through the UART via a command mode. Many useful features are included such as auto dial, redial, pulse or dial tone, auto answer, adaptive line probing, automatic symbol and carrier frequency during start up, retrain and rate negotiations. The industry standard AT command compatibility of the module enables the modem to be configured via an easy to use, simple to understand command line interface. The MT56xxSMI SocketModem® serial DTE channel can be interfaced directly to a UART and for maximum flexibility is configurable and capable of speeds from as low as 300bps through to 230Kbps. The modules are available in three speed variants, V.32bis, V34bis and V.92, giving flexibility to match a solution to specific requirements. They all support V.42bis data compression, V.80 synchronous access mode and V.22bis Fast Connect, in addition the MT5600SMI and MT5656SMI support FastPOS (V.29) making them an ideal choice for applications such as POS and payment terminals. SocketModem® modules also feature flash memory to allow for firmware updates enabling the user to stay current with latest enhancements.

Specification/Features: dependent on model

Client-to-Client data rate: 33600, 31200, 28800, 26400, 24000, 21600, 19200, 16800, 14400, 12000, 9600, 7200, 4800, 2400, 1200, 0-300bps

Data format: Serial, asynchronous, parallel

Data: V.92, V.34, V.32bis

Error correction: V.44, V.42 (LAP-M or MNP 2-4)

Data compression: ITU-T V.42bis

Serial Interface: supports DTE speeds to 230Kbps

Modes of operation: Full Duplex over dial-up lines, data mode, command mode and online command mode

AT command compatibility

Command buffer: 50 characters

DTMF detection

Caller ID (US configuration only)

Ringer Equivalence (REN): 0.4B

Telephony/TAM features:

Telephone answering machine (TAM)

V.253 commands

2-bit and 4-bit ADPCM, 8-bit linear PCM and 4-bit IMA coding, 8kHz sample rate, concurrent

Concurrent DTMF, ring and Caller ID detection

Diagnostics: local analogue loop

Dimensions: 2.7 x 6.5 x 1.8cm (1.045" x 2.541" x 0.680")

Operating temperature: 0°C to +70°C and -40 to +85°C for industrial build options (some models)

Operating Voltage: 3.3VDC ±10% or 5VDC ±10%

Power Requirements:

V.22bis: Typical 135mA (.445W @ 3.3VDC), Maximum 195mA (.702W @ 3.6VDC)

V.92, V.34, V.32: Typical 165mA (.545W @ 3.3VDC), Maximum 225mA (.780W @ 3.47VDC)

Approvals:

Safety Certifications - UL1950, EN60950, CSA950, AS3260, CCC, EN60601 (High Voltage Dielectric build option)

EMC Approvals - FCC Part 15 (Class B), Canadian (Class B), EN55022 (Class B), EN 55024

Tech Tip: AT Commands

What follows is a basic AT command summary. These commands are provided as a simple reference, some may
vary across different models of modems. All of them are prefixed by the attention code 'AT', and the command line
is completed with a carriage return. In most cases the commands can be concatenated, for example, ATE1V1<cr> to select
Echo and verbose mode.

When I'm testing modems, I often use the command string AT &K0 &D0 X1 E1 V1 W1 M2 L3 <cr>. This allows the modem
to completely ignore DTR and handshaking signals, ignores dial tone (or lack of it), and reports all of the line parameters
upon connection. In addition, the speaker is on all of the time, allowing me to hear network messages and possible
problems on the line....

Function
AT Attention Code.
A Go off-hook and attempt to answer a call.
A/ Re-execute command.
B0 Select V.22 2100 Hz answer tone.
B1 Select Bell 212A 2225 Hz answer tone.
B3 Select V.23 modulation.
C1 Return OK message.
Dn Dial Modifier.
E0 Turn off command echo.
E1 Turn on command echo.
F1 On-line character echo disabled.
H0 Initiate a hang-up sequence.
H1 If on-hook, go off-hook and enter command mode.
I0 Identify product via product code.
I1 ROM check sum request.
I2 ROM check sum status request.
I3 ROM part number and revision level request.
I4 OEM string request.
I5 PROM revision level request.
L0 Set low speaker volume (or speaker off).
L1 Set low speaker volume.
L2 Set medium speaker volume.
L3 Set high speaker volume.
M0 Turn speaker off.
M1 Turn speaker on during handshaking, & turn speaker off while receiving carrier.
M2 Turn speaker on during handshaking & while receiving carrier.
M3 Turn speaker off during dialling and receiving carrier, and turn speaker on during answering.
O0 Go on-line.
O1 Go on-line and initiate a V.22 bis retrain sequence.
P Force pulse dialling.
Q0 Allow result codes to DTE.
Q1 Inhibit result codes to DTE.
Sn Select S Register as default.
Sn? Return the value of S Register n.
T Force DTMF dialling.
V0 Report short form (terse) result codes.
V1 Report long form (verbose) result codes.
W0 Upon connection, the modem reports only the DTE speed
W1 Upon connection, modem reports modulation, line speed, protocol and DTE speed
W2 Upon connection, modem reports DCE speed
X0 CONNECT result codes are enabled, CONNECT XXXX result codes are disabled, and busy signal and dial tone are not detected.
X1 The modem blind dials, CONNECT XXXX result codes are enabled, and busy signal and dial tone are not detected.
X2 The modem waits for dial tone before dialling,CONNECT XXXX result codes are enabled, and busy signal is not detected.
X3 The modem blind dials, CONNECT XXXX result codes are enabled, and the modem sends the BUSY result code if busy signal is detected.
X4 The modem waits for dial tone before dialling,CONNECT XXXX result codes are enabled, and the modem sends the BUSY result code if busy signal is detected.
Y0 Disable long space disconnect before on-hook.
Y1 Enable long space disconnect before on-hook.
Z0 Restore stored profile 0 after warm reset.
Z1 Restore stored profile 1 after warm reset.
+++ Escape Code Sequence.
? Returns Last Addressed S Register.
*B Display list of Blacklisted numbers.
*D Display list of Delayed numbers.
+Hn Conexant Protocol Interface (RPI) Enable.
P Select pulse dialling. (dial modifier)
R Originate Call in Answer Mode. . (dial modifier)
Function
S=n Dial Stored Telephone Number (n=0:1)*. (dial modifier)
T Touch Tone Dial. (dial modifier)
W Wait for Dial Tone. (dial modifier)
; Return to Idle State. (dial modifier)
@ Wait for silence. (dial modifier)
! Flash. (dial modifier)
, Pause. (dial modifier)
0-9 DTMF digits 0 to 9. (dial modifier)
A-D DTMF digits A, B, C, and D. (dial modifier)
# The 'pound digit'. (dial modifier, tone dialling only).
* The 'star' digit. (dial modifier, tone dialling only).
&C0 Force RLSD active regardless of carrier state.
&C1 Allow RLSD to follow the carrier state.
&D0 The modem ignores DTR.
&D1 Asynchronous escape.
&D2 The modem hangs-up.
&D3 The modem performs soft reset.
&F Load Factory Defaults.
&G0 No guard tone selected.
&G1 No guard tone selected.
&G2 1800 Hz guard tone selected.
&K0 Disables flow control
&K3 Enables RTS/CTS flow control
&K4 Enables XON/XOFF flow control
&K5 Enables transparent XON/XOFF flow control
&L0 Select dial-up operation.
&M0 Asynchronous Communications Mode selected.
&Pn Make to Break Ratio Selection.
&Q0 Select direct asynchronous mode.
&S0 DSR is always active.
&S1 DSR is limited active.
&T0 Terminate any test in progress.
&T1 Initiate local analogue loopback.
&T3 Initiate local digital loopback.
&T4 Allow remote digital loopback.
&T5 Disallow remote digital loopback request.
&T6 Request remote digital loopback without self-test.
&T7 Request remote digital loopback with self-test.
&T8 Initiate local analogue loop with self-test.
&V Display current configurations.
&W0 Store the active configuration in NVRAM profile 0.
&W1 Store the active configuration in NVRAM profile 1.
&X0 Select internal timing for the transmit clock.
&Y0 Recall stored profile 0 upon power up.
&Y1 Recall stored profile 1 upon power up.
&Zn=x Store Telephone Number (n=0:1)*.
\N0 Selects normal speed buffered mode, disables error correction
\N1 If a serial modem, selects direct mode, same as &M0, &Q0. Parallel modem, has same effect as \N0
\N2 Selects reliable mode. Failure to establish an error corrected link results in the modem hanging up
\N3 Selects auto reliable mode. Attempts error corrected link, but will continue if not possible.
\N4 Selects LAPM error correction mode. Failure to negotiate an error corrected connection forces the modem to hang-up.
\N5 Selects MNP error correction mode. Failure to negotiate an error corrected connection forces the modem to hang-up.
%Dn DTMF Level Attenuation.
%Ln Transmit Level Attenuation.
%J Load Secondary Defaults.
%T DTMF and Calling Tone Diagnostic
Note: * Value(s) stored in NVRAM (if fitted)

GN110406 ED130406

Bits & Bauds

The terms baud and bps are often used in the same context. However, the two are not the same at all.
To clarify, the carrier signal is characterised by the number of signal intervals, or pulses, transmitted per second. Each pulse is called a baud, whereas bps stands for bits per second. Bps is a measure of how many bits can be transmitted during one pulse (one baud). Hence, bps = baud * number of bits per baud.

The confusion came about because early modems used to transmit only 1 bit per baud, so a 1200 baud modem would also be transmitting 1200 bps. These days, higher speeds are the norm, however for two-way communications, the baud limit is 1200 baud. Higher speeds are achieved by “packing “ as many bits as you can into 1 baud.

A modem operating at 9600 bps is still only transmitting at 1200 baud. But it is "packing" 8 bits into each baud:
9600 bps = 1200 baud * 8 bits per baud. The general technique for "packing" bits into a baud is called Quadrature Amplitude Modulation (QAM).

GN201005 ED130406

CX93011 CSM92/34/32bis Controllered Serial Modem

Controller-based modem with Worldwide SmartDAA®4 Line Side Device for Embedded Applications.

The Conexant CSM92, CSM34 and CSM32bis modems are part of Conexant's latest range of worldwide operational modem device sets for embedded applications and take advantage of Conexant's 4th Generation SmartDAA® technology. Depending on modulations up to V.92, from V.34, and V.32bis, and below respectively are included. The CSM92 supports V.44 in addition to other variants supporting V.42bis/MNP 5 data compression for greater data throughput, and V.42 LAPM/MNP2-4 error correction protocol for increased data integrity and reliability. These device sets comprise of a two chip solution consisting of a single chip modem device and a SmartDAA®4 line side device (LSD). The modem device itself integrates a microcontroller, DSP and a SmartDAA® system side device onto a single die. Intended for serial applications this modem is available as a tiny 20-pin QFN package that is both Pb-free and RoHS compliant. For flexibility the modem will accept 28.224MHz or 27.000MHz crystal or clock input.

CX20548 DAA incl BOM - Area is 3cm x 2.5cm incl barrier (7.5cm2)
Modem area is 2cm x 2cm (4cm2)
Modem area without XTAL is 1.25cm x 2cm (2.5cm2)
Total area for modem, DAA and components = 11.5cm2

Conexant's patented CX20548 SmartDAA®4 architecture simplifies application design, with their proprietary DIB design both reducing cost and minimising board space required. This is achieved by eliminating the bulky analogue transformers, relays and opto-isolators typically used in discrete and line powered DAAs. Typically compared with their earlier CX20493 SmartDAA®3 the new CX20548® SmartDAA®4 offers BOM count saving of 7 discrete components and a saving of about $0.25 (monolithic pricing). The CX20548 SmartDAA®4 exceeds WW regulatory requirements to meet OEM requirements maintaining all of the earlier CX20493 features with the following changes:
- Single transformer for power, clock and DIB interface.
- Internally synthesised Korean ring impedance
- DC coupled ring detect and CID
- Long DIB operation, which means the DIB can be placed up to 10" from the DAA with no performance degradation.
With its improved EMC immunity margins the SmartDAA4® boasts 6KV surge protection.

The modem operates by executing masked code from Internal ROM. Internal RAM enhances the flexibility of the modem by allowing limited upload of new country codes, overriding the existing 63 embedded country profiles and adding customised firmware code. An optional external serial NVRAM is supported, so permanent storage of new country profiles and customised fimware is facilitated. The enhanced telephony extension features such as Caller ID and Call Waiting detection are supported and as the modem is not line powered it is not subject to variations in the line voltage conditions.

Small low-profile packages, reduced voltage operation and low power consumption make this device set an ideal solution for embedded applications.

Typical applications

• Set top boxes
• POS terminals
• ATM machines
• Metering terminals
• Video game consoles
• Internet appliances

Features
• Modulations and protocols
- ITU-T V.92
- Modem-on-Hold ( V.92 version only)
- Quick connect (V.92 version only)
- PCM upstream (V.92 version only)
- V.90/V.34/V.32bis/V.32
- V.22bis/V.22/V.23/V.21
- V.23 reverse, V.23 half-duplex
- Bell 212A/Bell 103
- V.29 Fast POS
- V22bis fast connect
- V.80 Synchronous Access Mode
• Data compression
- V.44/V.42bis/MNP5
• Error correction
- V.42/MNP 4/MNP 2
• Call Waiting (CW) detection
• Type I and Type II Caller ID (CID) decoding
• DTE/host interface
- Serial DTE interface
- Direct Mode
- Asynchronous Mode
• No external memory required
• 63 embedded and upgradeable country profiles
• Serial NVRAM interface for optional permanent country profile storage
• Embedded AT commands
• SmartDAA
- Extension pick up detection
- Digital line protection
- Line reversal detection
- Line-in-use detection
- Remote hang-up detection
- Worldwide compliance
• Selectable 28.224 MHz or 27.000 MHz frequency of operation
• Low power and voltage
- Single +3.3V supply with +3.3V I/O level
- Low power consumption mode

A compact, robust RS232 external data modem reference design package is available in electronic form to minimise application design time, reduce design in costs and accelerate time to market. Included in the package are full data and schematics, board layout in Gerber, bill of materials (BOM) and vendor parts list (VPL).

GN140206 ED180406

CX90240 CSM22 Controllered Serial Modem

Controller-based Modem with Worldwide SmartDAA®4 Line Side Device for Embedded Applications

The Conexant CSM22 modem is part of Conexant's latest range of worldwide operational modem device sets for embedded applications and takes advantage of Conexant's 4th Generation SmartDAA® technology. The CSM22 supports V.42bis data compression for greater data throughput, and V.42 LAPM/MNP2-4 error correction protocol for increased data integrity and reliability. These device sets comprise of a two chip solution consisting of a single chip modem device and a SmartDAA®4 line side device (LSD). The modem device integrates a microcontroller, DSP and a SmartDAA® system side device onto a single die. Intended for serial applications the modem is available as a tiny 20-pin QFN package that is both Pb-free and RoHS compliant. For flexibility the modem will accept 28.224MHz or 27.000MHz crystal or clock input.

Conexant's patented CX20548 SmartDAA®4 architecture simplifies application design, with their proprietary DIB design both reducing cost and minimising board space required. This is achieved by eliminating the bulky analogue transformers, relays and opto-isolators typically used in discrete and line powered DAAs. Typically compared with their earlier CX20493 SmartDAA®3 the new CX20548 SmartDAA®4 offers BOM count saving of 7 discrete components and a saving of about $0.25 (monolithic pricing). The CX20548 SmartDAA®4 exceeds WW regulatory requirements to meet OEM requirements maintaining all of the earlier CX20493 features with the following changes:

Single transformer for power, clock and DIB interface.
Internally synthesised Korean ring impedance
DC coupled ring detect and CID
Long DIB operation, which means the DIB can be placed up to 10" from the DAA with no performance degradation.
With its improved EMC immunity margins the SmartDAA®4 boasts 6KV surge protection.

The modem operates by executing masked code from internal ROM. Internal RAM enhances the flexibility of the modem by allowing limited upload of new country codes, overriding the existing 63 embedded country profiles and adding customised firmware code. An optional external serial NVRAM is supported, so permanent storage of new country profiles and customised firmware is facilitated. The enhanced telephony extension features such as Caller ID and Call Waiting detection are supported and as the modem is not line powered it is not subject to variations in line voltage conditions.

Small low-profile packages, reduced voltage operation and low power consumption make this device set an ideal solution for embedded applications.

Typical applications

• Set top boxes
• POS terminals
• ATM machines
• Minitel Terminals

Features
• Modulations and protocols
- V.22bis/V.22/V.23/V.21
- V.23 reverse, V.23 half-duplex
- Bell 212A/Bell 103
- V.29 Fast POS
- V22bis fast connect
• Data compression
- V.42bis
• Error correction
- V.42/MNP 4/MNP 2
• Call Waiting (CW) detection
• Type I and Type II Caller ID (CID) decoding
• DTE/host interface
- Serial DTE interface
- Direct Mode
- Asynchronous Mode
• No external memory required
• 64 embedded and upgradeable country profiles
• Serial NVRAM interface for optional permanent country profile storage
• Embedded AT commands
• SmartDAA
- Extension pick up detection
- Digital line protection
- Line reversal detection
- Line-in-use detection
- Remote hang-up detection
- Worldwide compliance
• Selectable 28.224 MHz or 27.000 MHz frequency of operation
• Low power and voltage
- Single +3.3V supply with +3.3V I/O level
- Low power consumption mode

A compact, robust RS232 external data modem reference design package is available in electronic form to minimise application design time, reduce design in costs and accelerate time to market. Included in the package are full data and schematics, board layout in Gerber, bill of materials (BOM) and vendor parts list (VPL).

* Chipset consists of 20-pin QFN controller and 16-pin QFN Smart DAA

GN240206 ED130406

The Conexant CX06837 Fax/Data Modem offers Group 3 facsimile send and receive speeds up to 14400 bps with optional V.34 half-duplex mode operation up to 33600 bps. The modem optionally supports duplex data mode - V.90 PCM data mode, and V.92 PCM data mode. In V.92 PCM data mode, the Quick Connect feature is supported where the V.92-compatible server is available. The CX06837 modem also features the voice codecs that enable Digital Telephone Answering Machine (DTAM), and optionally supports full-duplex speaker phone. This combination of fax/data communication with telephony features is an ideal solution for highly integrated communication terminals.

Features
• V.34/V.17 Fax option
• V.32bis/V.90/V.92 Quick Connect data option
• G.723.1 codec with 5.3 kbps or 6.3 kbps compression/decompression rate
• G.711 codec with 64 kbps compression/decompression rate
• Full-duplex speakerphone
• Handset Mode, with external codec
• 128-pin LQFP

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