Remotely actuated telephone instrument connection block having i

Details Remotely actuated telephone instrument connection block having i Remotely actuated telephone instrument connection block having i

1982-06-21

1984-02-28

Schreyer, Stafford D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

1791753R, 361191, 361155, H04M 316

Patent

active

044343280

ABSTRACT:
A lockout circuit improves a remotely activated loop testing connection block for disconnecting a telephone subscriber's service instrument from a telephone tip and ring line pair during a test interval. The lockout circuit includes a latching relay which is responsive to a lockout command signal only when it is sent during a remotely commanded test interval. The instrument is reconnected automatically at the beginning of a subsequent test interval.

REFERENCES:
patent: 3699265 (1972-10-01), Altenburger
patent: 3852537 (1974-12-01), Vincent
patent: 4169220 (1979-09-01), Fields

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