Pulse or digital communications – Transceivers – Modems
Patent
1994-09-08
1998-09-15
Chin, Wellington
Pulse or digital communications
Transceivers
Modems
379 93, H04J 322
Patent
active
058090681
ABSTRACT:
A modem having reduced power dissipation and temperature compensation. The modem includes a data pump, a telephone line interface, memory and a controller, connected to the memory and the data pump, for executing program code to control transfers between the data pump and a telephone line. The telephone line interface includes a current-limited loop holding circuit in order to limit power dissipated in the modem due to DC loop current. The current-limited loop holding circuit includes a constant current source in series with a DC loop holding circuit.
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AT&T Microelectronics catalog entitled Modem Designer's Guide, dated Oct. 25, 1993.
Zilog User's Manual entitled Z86017 PCMCIA Adaptor Chip--Solutions for PCMCIA Applications.
AT&T Microelectronics catalog entitled AT&T HSM144xD Data Pump Chip Sets (14,400 bits/s Data/FAX, Parallel Data Mode, ROM Code MG); dated May 1993.
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"PCM-COM422" PCMCIA Data Acquisition, Control, and Communications, vol. 8, p. 16.
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Chin Wellington
Corrielus Jean B.
Multi-Tech Systems, Inc.
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