Telephone receiver-off-hook-and-in-use detector

Details Telephone receiver-off-hook-and-in-use detector Telephone receiver-off-hook-and-in-use detector

1976-06-28

1977-05-10

Cooper, William C.

179 1VC, 179 18AB, 179 1MN, H04M 322

Patent

active

040229890

ABSTRACT:
A telephone line reported by a subscriber to be busy may be checked by the disclosed apparatus to determine if the telephone is actually in use or merely appears busy because of leakage in the telephone line or of the receiver being accidentally off-hook. When the telephone is actually in use, peaks in signals present on the line are counted and cause an in-use indication. When an accidentally off-hook or leakage condition is present, particular signals on the line or the absence of signals cause a not-in-use indication.

REFERENCES:
patent: 3448215 (1969-06-01), Engel
patent: 3873772 (1975-03-01), Dumler
patent: 3972603 (1976-08-01), Lubinec

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