Loopback test

Multiplex communications – Wide area network – Packet switching


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370 56, 1791753R, H04J 314




A digital concentrator system for use with a plurality of digital carrier systems in the telephone subscriber loop plant is disclosed. The concentrator system comprises a central office terminal (100), a remote terminal (102), and an interconnecting digital carrier path (108). In the transmit direction at each terminal (110,112), a plurality of multiplexed encoded signal streams are demultiplexed and the encoded signals stored. A selected number of encoded signals are retrieved and multiplexed for transmission to a distant terminal (112,110) as a concentrated pulse stream (123,175). In the receive direction at each terminal (110,112), the encoded signals in the multiplexed concentrated stream (125,177) are demultiplexed and stored. The stored encoded signals are retrieved and the original number of encoded signal streams derived for transmission to the carrier terminal (100,102). Supervisory and control communication between the two concentrator terminals (110,112) is achieved by way of data messages on a derived data link. Operation between the transmit and receive directions at each terminal is asynchronous and controlled by a microcomputer (124,160). A PCM looping test for determining that a continuous path exists through the digital concentrator system is included.

patent: 3892923 (1975-07-01), Ranner
patent: 4064369 (1977-12-01), Battocletti
patent: 4070648 (1978-01-01), Mergenthaler et al.
patent: 4232386 (1980-11-01), McDonald et al.
patent: 4279032 (1981-07-01), Smith


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