COMMUNICATION SEMICONDUCTORS
DATA BULLETIN
CMX635
ISDN Subscriber Processor
ADVANCE INFORMATION
Features
• S/T Interface to ITU-T I.430 (TE & NT1)
• 2B + 1D-channel HDLC Controllers
• IOM™-2 / GCI Interface
• Selectable A-Law/µ-Law PCM Codec
• 100mW Speaker-Phone Output
• 2 Independent Analog Inputs
• Pre-Programmed Tone Generators
• V.23/Bell 202 FSK Generator
• Ringing Signal and SPM Generators
• DTMF Encoder/Decoder
Applications
• ISDN Terminal Equipment
• ISDN Intelligent NT’s
• ISDN Phones and Feature Phones
• Digital & Analog Answer-Phones
• Data Adapters
• Active and Passive Terminal Adapters
• Alarm Systems
• Point-Of-Sale Terminals
• ‘Group 4’ Fax Equipment
• Video Phones
The CMX635 is an integrated Subscriber Processor designed for low chip-count ISDN voice/data terminals
and POTS terminal adapters. Its functions facilitate operation in an ISDN feature phone with speakerphone
capability or in a POTS terminal adapter with Subscriber Pulse Metering (SPM), DTMF encoder/decoder,
Caller Line ID (CLID) and Caller ID on Call Waiting (CIDCW) capabilities. It also implements many functions
needed in an intelligent NT or NT1Plus system.
The CMX635 incorporates a 4-wire ST interface conforming to ITU-T I.430 and ETS 300 012-1 specifications.
HDLC Controllers and associated FIFOs are provided for B1, B2 and D-channels, which can be configured to
automatically process the bit stuffing, flag generation/recognition, address matching and CRC
generation/checking required to support the ITU Q.921 protocol. An IOM-2TM /GCI interface is provided to
enable operation with other IOM compliant devices.
The µController interface is compatible with multiplexed and non-multiplexed address/data busses and
generic Motorola and Intel style control. The CMX635 will automatically detect which style of interface is being
used and configure itself accordingly. The device is available in a 48-pin TQFP package and has progressive
powersave modes to aid low power operation.
IOM is a trademark of Siemens AG.
2001 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 204800225.002
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.