Telephony distribution system

Details Telephony distribution system Telephony distribution system

2011-04-05

2011-04-05

Sing, Simon (Department: 2614)

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

C379S383000

Reexamination Certificate

active

07920695

ABSTRACT:
A telephony distribution system includes a plurality of terminals with two connection points (16A), each for one pair of conductors (17A) forming part of a telephony distribution installation, and, for each of those terminals (16A), a short-circuit manager (25) including a substitution current source (26), a switch (27) and control means (28-31) for causing the switch (27) normally to assume a position in which its output terminal (34) is connected to an input terminal (32) itself connected to a pair of conductors (13, 15) providing a telephone line and to cause the switch (27). In the event of a short-circuit between the two connection points of the terminal (16A) concerned, to assume a second position in which that terminal is connected to the auxiliary current source (26).

REFERENCES:
patent: 4551671 (1985-11-01), Annunziata et al.
patent: 4748652 (1988-05-01), Nagai et al.
patent: 5247242 (1993-09-01), Yamaguchi et al.
patent: 2004/0120508 (2004-06-01), Sajadi et al.

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