Verification of subscriber lines prior to cutover to a new switc

Details Verification of subscriber lines prior to cutover to a new switc Verification of subscriber lines prior to cutover to a new switc

1991-12-20

1993-02-16

Schreyer, Stafford D.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Of centralized switching system

379 11, 379 18, H04M 322

Patent

active

051877333

ABSTRACT:
The present invention addresses an improved solution to the problem of cutover verification testing where a new digital switching system is to replace an existing switching system that serves at least a group of subscribers via continuous wire lines. It permits a plurality of existing wire lines to be concurrently connected to channel units associated with the new switching system without adversely impacting the existing service and automatic testing under the control of the new system.

REFERENCES:
patent: 3892928 (1975-07-01), Casterline et al.
patent: 4059731 (1977-11-01), Green et al.
patent: 4322843 (1982-03-01), Beuscher et al.
patent: 4520234 (1985-05-01), Fields et al.
patent: 4653043 (1987-03-01), Brady et al.
patent: 4833708 (1989-05-01), Goodrich
patent: 5065422 (1991-11-01), Ishikawa

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