Key telephone hold arrangement

Details Key telephone hold arrangement Key telephone hold arrangement

H - Electricity

04

M

379/33

H04M 3/42 (2006.01) H04M 3/428 (2006.01)

Patent

CA 1168774

- 19 - KEY TELEPHONE HOLD ARRANGEMENT Abstract of the Disclosure There is disclosed a line circuit for establishing a hold condition on a communication line, extending between a switching machine and a key telephone station, during an open switching interval when no current flows on the communication line. The control signal required to enable the hold circuit is arranged to be time dependent. For a fixed time interval, which bridges the OSI period, after the telephone station answers a ringing line a hold condition is enabled exclusively by a control signal on the A-lead from the station. This time dependent hold enable arrangement permits a hold capability during an OSI condition. After this time interval elapses a hold condition is enabled by a joint signal condition on the A- lead and a current continuity condition on the communication line.

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