Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Patent
1986-03-17
1988-02-16
Ng, Jin F.
Telephonic communications
Telephone line or system combined with diverse electrical...
Having transmission of a digital message signal over a...
379230, 379269, 379334, H04Q 360
Patent
active
047260548
ABSTRACT:
A system for interconnecting a pair of communication systems comprising a pair of expansion switching matrices connected to bidirectional signal ports of the respective communication systems and interconnected via a plurality of signal paths, such as junctors. Control information is transmitted between central controllers of the pair of communication systems via a pair of serial data transmission circuits, such as universal asynchronous receiver/transmitters. Thus, predetermined ones of the signal ports of the separate communication systems may be interconnected via the expansion switching circuits independently of signal traffic within the respective communication systems. In addition, special features such as call ring back busy, may be implemented between signal ports of the respective communication systems as a result of control information being communicated via the serial data transmission circuits. The system according to the present invention is of simple and inexpensive design, and may be advantageously implemented for use in key telephone systems and PABXs.
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Battarel et al., "MT35 Switching System: Intersite Communication System", Commutation & Transmission No. 4, 1983.
Connors M. E.
Ng Jin F.
Trillium Telephone Systems Inc.
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