Method and a circuit arrangement for setting the subscriber line

Details Method and a circuit arrangement for setting the subscriber line Method and a circuit arrangement for setting the subscriber line

1990-01-31

1991-08-27

Ng, Jin F.

Multiplex communications

Wide area network

Packet switching

379398, 379406, 379402, H04B 320

Patent

active

050439774

ABSTRACT:
A control unit of a subscriber line termination module has access via a programmable interface to the transmitting and receiving arms of a time division multiplex line connected to the switching network. At intervals which are long in relation to the pulse frame length, during the course of existing connections, PCM-words which occur N-times on the receiving arm and, in each case following a reflection time, during a plurality of pulse frames, a plurality of PCM-words occurring on the transmitting arm are received, subjected to amplitude evaluation and, if recognized as valid, subjected to cross-correlation. The result of the cross-correlation provides a control value for the dummy impedance.

REFERENCES:
patent: 4161633 (1979-07-01), Treiber
patent: 4254305 (1981-03-01), Treiber
patent: 4381561 (1983-04-01), Treiber
patent: 4489222 (1984-12-01), Lusignan et al.
patent: 4685103 (1987-08-01), Black
AM7950-Advance Information and Application Notes, Jun. 1984 and Jun. 1985, Advanced Micro Devices.

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