Office line connection circuit during service interruptions in k

Details Office line connection circuit during service interruptions in k Office line connection circuit during service interruptions in k

1979-01-30

1981-04-07

Brigance, Gerald L.

179 99LC, 179 18GE, H04Q 518, H04M 100

Patent

active

042608570

ABSTRACT:
A switching matrix in the key service unit of a key telephone system is formed by several groups of relays, each group being associated with a particular station set and each relay in each group also being associated with a particular central office line. All of the relays, except one in each group, disconnect the associated station set from the associated line when the relay is de-energized. One relay in each group functions in the opposite manner to connect the associated station set to the associated line upon failure of the local power supply.

REFERENCES:
patent: 3660611 (1972-05-01), Knollman et al.
patent: 4010331 (1972-03-01), Taylor et al.
patent: 4027110 (1977-05-01), Takematsu et al.
patent: 4096359 (1978-06-01), Barsellotti
patent: 4117274 (1978-09-01), Cannon et al.
patent: 4125749 (1978-11-01), Kinoshita et al.

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