Logic control for electronic key telephone line circuit

Details Logic control for electronic key telephone line circuit Logic control for electronic key telephone line circuit

H - Electricity

04

M

379/33, 379/57

H04M 3/22 (2006.01) H04M 3/42 (2006.01) H04M 9/00 (2006.01)

Patent

CA 1079428

LOGIC CONTROL FOR ELECTRONIC KEY TELEPHONE LINE CIRCUIT Abstract of the Disclosure An electronic key telephone line circuit is dis- closed for controlling the hold and disconnect conditions with respect to associated telephone stations in response to transient signals generated upon on-hook to off-hook and off-hook to on-hook transitions of those stations. Due to the nature of the switchhook contacts, the tip and ring leads open before the A-lead opens. Since the disconnect condition is determined from a transient signal caused by the tip and ring lead opening together with an A-lead open, and since by its very nature the transient response of the tip and ring lead transition can be finished before the A-lead opens, timing is used to delay the transient signal to insure that the line circuit goes into the proper mode.

283141

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