Telecommunication switching system

Details Telecommunication switching system Telecommunication switching system

1986-09-08

1988-08-16

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

379 12, 379 25, H04J 116

Patent

active

047649186

ABSTRACT:
An electronic switching network for use as a transit exchange, interconnects PCM digital trunks, and handles large numbers, e.g. 1,000 inlets and 1,000 outlets of such trunks. The switching network is fully electronic, using integrated circuit units. To provide a self-checking function, the intelligence arriving via the trunks is converted (2) into a redundant line code, e.g. 3B-6B, which has spare code combinations which are used to provide an auxiliary data channel through the switch matrix (3). The converter (2) applies to that data channel the inlet port number for a connection via the switch matrix (3). At the outlet side another converter (4) converts back to the line code (e.g. HDB-3) used over the trunks, and also extracts the inlet port number. This is then compared with what it should be, and the result of this comparison indicates whether the switch is functioning correctly. Thus the checking occurs while the switch is handling traffic.

REFERENCES:
patent: 4376998 (1983-03-01), Abbott et al.
patent: 4397020 (1983-08-01), Howson
patent: 4592044 (1986-05-01), Ferenc
patent: 4601028 (1986-07-01), Huffman et al.

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