CMX625

CMX625 ISDN TA POTS Interface D/625/2 July 2001 Advance Information 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 1.1 Brief Description The CMX625 is an integrated telecom 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 12kHz/16kHz 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 companding following ITU-T recommendation 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 syst...