Series equipment with DC line hold transfer

Details Series equipment with DC line hold transfer Series equipment with DC line hold transfer

1997-04-14

1999-08-17

Le, N.

Telephonic communications

Subscriber line or transmission line interface

379387, 379398, H04M 100

Patent

active

059405007

ABSTRACT:
A telephone series equipment line circuit for connection between a central office (CO) line and a terminal equipment (TE) line comprising a filter connected between the lines for blocking message signals from passing therebetween and for passing direct current (DC), a DC bypass circuit including a first series switch apparatus connected between the lines around the filter, series equipment connected via a DC blocking circuit and second series switching apparatus to the lines, the first switch apparatus being open and closed reciprocally to the second switch apparatus.

REFERENCES:
patent: 4322586 (1982-03-01), Mein
patent: 4926466 (1990-05-01), Ayello et al.
patent: 5315644 (1994-05-01), Lester et al.
patent: 5448624 (1995-09-01), Hardy et al.
patent: 5459440 (1995-10-01), Claridge et al.
patent: 5790656 (1998-08-01), Rahamim et al.
Newton's Telecom Dictionary, 8.sup.th Edition p. 125 "Bandpass filter", 1994.

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