CMX625 Datasheet | Consumer Microcircuits Limited

Features - SPM and Ringing Voltage Generators - Integrated DTMF Decoder/Encoder - V.23/Bell 202 FSK/Tone Generator - Selectable A-Law/µ-Law PCM Codec - IOM-2 Interface Terminal Mode and Non-Terminal Mode (Line Card Mode) Applications - ISDN NTUs with Analogue Ports - ISDN Line Cards - Wireless Local Loop Termination Cards - ISDN Terminals with Additional POTS Ports - PC based ISDN Cards with Telephone Ports - Billing/SPM Systems IOM is a trademark of Siemens AG Brief Description The CMX625 is an integrated tele tone generator, DTMF encoder/decoder and PCM Codec-Filter designed for ISDN interfaces, Wireless Local Loop and other digitised speech systems. The tone generator covers a wide range of pre-programmed tones used in analogue phone systems. Three outputs are provided: Ringing signals, In-band tones or FSK data, and 12k Hz/16k Hz Subscriber Metering pulses. The PCM Codec-Filter performs voice digitisation and reconstruction and incorporates band limiting and smoothing with selectable A-law or µ-law panding following ITU-T remendation G.711. The DTMF decoder presents the serial bus interface with the DTMF dialling information received from the telephone user and the tone generator sends the appropriate DTMF tones to this POTS interface. Other tone standards supported are: Fax and Modem ‘answer’ and ‘originate’, ITU-T ‘R1’ and ‘R2’ signals, dual tones for CIDCW and 'On-Hook' signalling systems and sufficient tones for simple melody generation. The IOM -2 (ISDN Oriented Modular revision 2) industry standard serial bus provides the digital interface to other telemunications ICs and supports both Terminal and non-Terminal (or Line Card) modes. The CMX625 is patible with the CMX635 ISDN Subscriber Processor and can be used to provide the additional POTS port. It is available in both DIP and SSOP packages. ®  2001 Consumer Microcircuits Limited .Data Sheet.in ISDN TA POTS Interface CONTENTS Section 1.1 1.2 1.3 1.4 1.5 Page Brief Description...