Telephone line bank auxiliary line switching circuit

Details Telephone line bank auxiliary line switching circuit Telephone line bank auxiliary line switching circuit

1978-10-26

1980-06-17

Robinson, Thomas A.

H04Q 114

Patent

active

042085519

ABSTRACT:
A plurality of miniaturized auxiliary line switching circuits on circuit boards adapted to be mounted in existing space on a main distributor frame of telephone switching equipment, particularly the Stromberg Carlson XY line finder equipment. Each auxiliary circuit includes a miniaturized line relay coil, cut-off coil and lock-out coil with circuitry for connecting to the eleventh pins on the wire bank of the XY switching equipment. The circuitry also includes a first indicator lamp circuit to indicate normal use of each auxiliary circuit and a second indicator lamp circuit to indicate a lock-out condition in each auxiliary circuit, as well as test points in the line relay circuit and an optional pay-tone switch circuit.

REFERENCES:
patent: 2742535 (1956-04-01), Blackhall et al.
patent: 3518611 (1970-06-01), Shores, Jr.
patent: 3851114 (1974-11-01), Bush et al.
patent: 3855427 (1974-12-01), Sinden
patent: 3947732 (1976-03-01), Cwirzen
patent: 3955868 (1976-05-01), Kindermann et al.
patent: 4002856 (1977-01-01), Sedlacek et al.

Affiliated with

Also associated with

Rating

Telephone line bank auxiliary line switching circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Telephone line bank auxiliary line switching circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Telephone line bank auxiliary line switching circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-476199