Trunk adapter

Details Trunk adapter Trunk adapter

1975-03-25

1977-01-11

Cooper, William C.

H04Q 358

Patent

active

040028500

ABSTRACT:
A trunk adapter is associated with a common control private automatic branch exchange telephone system for interfacing the system with a central office. Four different types of adapters are associated with the system to effect a ring-down incoming, loop start outgoing trunk connection, a ground start type trunk connection, a two-way dial-to-dial trunk connection, and a two-way E and M signalling interface. To provide a buffer between the ring and tip circuits the adapters employ optical coupler circuits. The adapters are controlled by the common control on a time shared basis and operate independently of the state of the sleeve lead.

REFERENCES:
patent: 3806660 (1974-04-01), Gueldenpfennig

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