Patent
1983-11-30
1986-05-06
Brown, Thomas W.
179 18J, H04Q 130, H04Q 378
Patent
active
045873810
ABSTRACT:
A telecommunications exchange includes line identification apparatus in which signals on additional wires (the `p` wires) (1) which are switched in parallel with the speech pairs are used to identify an originating exchange line circuit. On detection of seizure of the `p` wire (1) at one of a number of call logging points (11) a data signal is transmitted by a transmitter circuit (9). On detection of such a signal a receive circuit (2) adds a plurality of data bits to the signal identifying one of a number of associated `p` wires (1) on which the signal was received and transmits the modified data signal to a receiver multiplexer (4, 4'). On receipt of the modified data signal the receiver multiplexer (4, 4') adds a respective plurality of data bits to the signal identifying one of a plurality of receivers (2) connected thereto and retransmits the signal to a further multiplexer (5, 5'). The further multiplexer (5, 5') adds a respective plurality of bits and transmits the signal to a control circuit (6, 6') which adds further bits identifying the further multiplexer (5, 5'). The complete signal is then transmitted to call logging apparatus.
REFERENCES:
patent: 3746797 (1973-07-01), Meise, Jr. et al.
patent: 3925623 (1975-12-01), Tysseland
patent: 4295007 (1981-10-01), Astegiano et al.
Brown Thomas W.
The General Electric Company p.l.c.
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