CMX635
ISDN Subscriber Processor
D/635/2 December 2001
Features
Applications
Advance Information
• 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 Analogue Inputs
• Pre-Programmed Tone Generators
• V.23/Bell 202 FSK Generator
• Ringing Signal and SPM Generators
• DTMF Encoder/Decoder
• ISDN Terminal Equipment
• ISDN Intelligent NT’s
• ISDN Phones and Feature Phones
• Digital & Analogue Answer-Phones
• Data Adaptors
• Active and Passive Terminal Adaptors
• Alarm Systems
• Point-Of-Sale Terminals
• ‘Group 4’ Fax Equipment
• Video Phones
IOM is a trademark of Siemens AG.
1.1 Brief Description
The CMX635 is an integrated Subscriber Processor designed for low chip-count ISDN voice/data
terminals and POTS terminal adaptors. 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.
© 2001 Consumer Microcircuits Limited