Partyline subscriber interface circuit

Details Partyline subscriber interface circuit Partyline subscriber interface circuit

1978-09-12

1980-08-26

Brown, Thomas W.

179 18AB, H04M 316

Patent

active

042197007

ABSTRACT:
A station set interface circuit for connection to a multi-party line, for prohibiting connection of a party line subscriber's set to the party line in the event the line is in use and for returning busy tone to the subscriber's set. A hookswitch flash by the subscriber causes the circuit to connect the subscriber's set to the party line for a predetermined period, while applying a warning tone to the party line for transmission to the parties of the call in progress at the beginning and end of the period.

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patent: 4022983 (1977-05-01), Braun et al.
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