Key telephone off-premises line circuit

Details Key telephone off-premises line circuit Key telephone off-premises line circuit

1975-08-28

1977-08-02

Claffy, Kathleen H.

H04M 172

Patent

active

040397629

ABSTRACT:
An off-premises line circuit is disclosed which allows two telephone stations separated by a distance greater than lamp range to share a common central office or PBX line. Lamp signals as well as hold release commands are exchanged between stations by a signaling pair of leads. The off-premises line circuit is arranged so that either station may release the hold condition without regard as to which station established that condition.

REFERENCES:
patent: 3758729 (1973-09-01), Everhart

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