Office line connection circuit during service interruptions...

Details Office line connection circuit during service interruptions... Office line connection circuit during service interruptions...

H - Electricity

04

Q

379/33

H04Q 5/00 (2006.01) H04M 9/00 (2006.01)

Patent

CA 1136784

OFFICE LINE CONNECTION CIRCUIT DURING SERVICE INTERRUPTIONS IN KEY TELEPHONE APPARATUS Abstract of the Invention 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.

326739

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