Subscriber line interface modem
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United States of America Patent
Stats
-
Mar 7, 1989
Issued Date -
N/A
app pub date -
Sep 10, 1987
filing date -
Nov 28, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The subscriber line interface modem is for use in a telecommunications system line interface module which also includes subscriber signalling and switching circuits and a control microprocessor. The modem comprises bus interfacing means, channel means and clock supply means. The interfacing means receives address data and control information from the microprocessor and dispatches address, data and control information to the microprocessor for evaluation. The channel means includes a non-return to zero/conditioned diphase modulation (NRZ/CDM) conversion means which receives NRZ coded information from the circuits and dispatches CDM information to the subscriber line. A CDM/NRZ conversion means receives CDM information from the subscriber line and dispatches NRZ coded information to the circuits. The processing of information through the modem is controlled by the microprocessor in conjunction with the clock signals generated by the clock supply means.
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