Subscriber digital multiplexing system with time division concen

Details Subscriber digital multiplexing system with time division concen Subscriber digital multiplexing system with time division concen

1974-12-09

1977-01-04

Stewart, David L.

179 18FG, 179 15AT, H04M 714

Patent

active

040015149

ABSTRACT:
A digital multiplexer for transmitting control, signaling and speech information in digital form between a central telecommunications office (CO) and a plurality of remote terminals. The system serves a plurality of lines at the exchange and couples those lines to subscriber stations associated with those lines through a digital span line such as the generally known Tl line between a CO terminal and the remote terminals. A maximum of 32 channels are provided using continuously variable slope delta modulation, with the modulation and demodulation being performed in line circuits individual to each line being served. A time division concentration stage enables the system to service 128 lines over the 32 channels with each channel having a memory position for storage of line address information.

REFERENCES:
patent: 3492435 (1970-01-01), Inose
patent: 3576399 (1971-04-01), Schweitzer
patent: 3781485 (1973-12-01), Woodward
patent: 3790713 (1974-02-01), Neufang
patent: 3856993 (1974-12-01), Closs

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