Universal pbx line circuit for key and non-key service

Details Universal pbx line circuit for key and non-key service Universal pbx line circuit for key and non-key service

H - Electricity

04

M

379/33, 379/67,

H04M 1/00 (2006.01) H04M 3/22 (2006.01) H04M 9/00 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 1039424

A UNIVERSAL PBX LINE CIRCUIT FOR KEY AND NON-KEY SERVICE Abstract of the Disclosure A line circuit for a time division switching PBX is disclosed which can serve conventional non-key telephone sets as well as pick-up key telephone sets having access to other telephone lines that may be served by prior art relay-operated key telephone line circuitry. The line circuit has a port appearance in the time division network and an electronic scan point for reporting the switchhook state of the associated telephone set. The circuit contains two, three-state flip-flops for correctly responding to the busy, idle or hold states that may be imposed by the associated telephone set and for distinguishing conventional A lead potentials when used with one or more conventional pick-up key telephone sets. No adjustment is required for operating with telephone sets that have no pick-up keys regardless of whether or not these sets maintain the A lead open-circuited or grounded.

237230

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