Method for monitoring existing telephone connections, particular

Details Method for monitoring existing telephone connections, particular Method for monitoring existing telephone connections, particular

1993-11-03

1995-05-09

Chin, Wellington

Multiplex communications

Wide area network

Packet switching

370 16, 371 204, 371 682, H04L 1226, H04L 112, H04L 124

Patent

active

054146950

ABSTRACT:
In a method for monitoring existing telephone connections, particularly permanently switched telephone connections, the information that correspond to one another and come from the redundant switching network halves (SN0, SN1 ) are compared to one another. The information intended for forwarding to connected lines is branched in the interface (LTU) at the line side into a separate time channel (K0) and is transmitted back to the interface (LIU) at the switching network side and are compared thereat to said information. Information coming from the lines is branched into the separate time channel and is transmitted in parallel with the original information to the interface (LIU) at the switching network side. The branched information is compared to the original information in the interface (LIV) at the switching network side. The procedures ensue time-channel-by-time-channel.

REFERENCES:
patent: 4387456 (1983-06-01), Creteau
patent: 4821256 (1989-04-01), Schmidt et al.
patent: 4995042 (1991-02-01), Guthaus et al.

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