Subscriber line card arrangement

Details Subscriber line card arrangement Subscriber line card arrangement

1988-09-06

1991-01-08

Mis, David

Telephonic communications

Subscriber line or transmission line interface

379383, H04J 304

Patent

active

049842668

ABSTRACT:
A subscriber line card arrangement, in which each of eight subscriber lines is interfaced by a respective high voltage analog circuit, followed by a low voltage circuit for producing essential analog functions including over-sampled analog-to-digital and digital-to-analog conversion. A single CMOS digital signal processor (DSP) is multiplexed between each of the eight channels to perform digitial signal processing of the telephone signals in each channel. Silicon usage for the high voltage functions is reduced as is the amount of bipolar analog circuitry. Digital hardware is saved by multiplexing the DSP. The invention is useful in central offices and PABX's.

REFERENCES:
patent: 4451708 (1984-05-01), Kemler et al.

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