Communication system having separate unidirectional information

Details Communication system having separate unidirectional information Communication system having separate unidirectional information

1986-03-14

1987-10-20

Dwyer, James L.

Telephonic communications

Multi-line or key substation system with selective switching...

Switching or supervision feature

379217, 379252, 379257, H04M 342, H04Q 310

Patent

active

047019484

ABSTRACT:
A bidirectional communication system having separate unidirectional information signalling for connection to one or more signal ports, comprised of a first switching matrix for effecting bidirectional communication between one or more of the signal ports and a second separate switching matrix for establishing unidirectional communication from one or more information signal sources to a predetermined one or more of the signal ports. Preferably, the communication system is a telephone system and the signal ports are local subscriber sets and outside telephone lines. The information signal sources can be, for instance, supervisory tone generating circuits such as DTMF generators, RING BACK, DIAL TONE or BUSY/ERROR signal generators. Alternatively, the signal sources may be music on hold circuits or circuits for generating out of voice band data signals. According to the present invention, the information signals are transmitted to the one or more signal ports independently of signal traffic in the first switching matrix, resulting in highly efficient signal switching through the first and second matrices.

REFERENCES:
patent: 4412102 (1983-10-01), Ogawa et al.

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