Title: Telephone line bank auxiliary line switching circuit

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.

Do you think this is a good invention? Vote now:

Votes so far: For:(0) Against:(0)
Other info:

Inventors: Passarella, Thomas M. (Florence, AL, US)

Application Number: 955018
Filing Date: 1978-10-26
Publication_date: 1980-06-17
Assignee:
Primary Class(es): 379/327 379/146
Other Classes:
US Patent Ref:

2742535	Apr, 1956	Blackhall et al.	179/91.
3518611	Jun, 1970	Shore, Jr.	179/98.
3851114	Nov, 1974	Bush et al.	179/98.
3855427	Dec, 1974	Sinden	179/98.
3947732	Mar, 1976	Cwirzen	179/98.
3955868	May, 1976	Kindermann et al.	179/98.
4002856	Jan, 1977	Sedlacek et al.	179/98.

Other Refs:
Primary Examiner: Robinson, Thomas A.
Assistant Examiner:
Attorney: Lackey; Harrington A.