Station checking network for telecommunication system

Details Station checking network for telecommunication system Station checking network for telecommunication system

1976-02-11

1977-05-17

Olms, Douglas W.

1791752R, H04B 346

Patent

active

040243605

ABSTRACT:
A marker at a central-office terminal, controlling the establishment of connections between local subscriber lines and inter-office links via an associated line concentrator/distributor, includes a source of d-c test signals of reversible polarity connectable in a phantom circuit which extends from the central office via a transmitting and a receiving branch of a local line to a subscriber station tied to that line. The subscriber station has a master switch, establishing either an inactive position or a standby position, and a hook switch closable in the standby position to initiate or accept a call. Depending on the positions of these two switches, a current discriminator at the marker detects one of three current levels (zero, low or high) with either polarity of the test signal to determine whether a call can go through or whether an alarm condition exists.

REFERENCES:
patent: 3417210 (1968-12-01), Chapin
patent: 3444336 (1969-05-01), Holt et al.
patent: 3624316 (1971-11-01), Roberts
patent: 3731012 (1973-05-01), Shaffer

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