Private branch exchange system

Details Private branch exchange system Private branch exchange system

1993-09-30

1996-12-03

Zele, Krista M.

Telephonic communications

Substation or terminal circuitry

Conversion of signal form

379156, 379322, 379377, H04M 174

Patent

active

055816126

ABSTRACT:
In a private branch exchange system which includes a private branch exchange accommodating a plurality of line wires and extensions for switching lines between the two, and telephones, which are usable in the event of a power failure, connected to the extensions, the line wires and the power-failure telephones are connected when power feed to the private branch exchange is no longer performed owing to a power failure or the like. When power feed is restored, the call status of the power-failure telephone is monitored and, if it is found that a call is in progress.

REFERENCES:
patent: 4575584 (1986-03-01), Smith et al.
"Novelink: A Small, Multifeature PABX"; By R. A. Steinberg; 1225 Electrical Communication vol. 61, No. 4, Feb. 26, 1987; Brussels, BE pp. 439-445.

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