Method and system for transferring special circuit telephone pai

Details Method and system for transferring special circuit telephone pai Method and system for transferring special circuit telephone pai

1992-10-15

1994-11-15

Kuntz, Curtis

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

379 1, 379 20, 379 21, 379273, 379 93, H04M 1100, H04M 124, H04M 300

Patent

active

053655788

ABSTRACT:
The system has two units for transferring a telephone circuit from an old pair to a new pair between two locations. Each unit has a carrier amplitude measuring circuit to determine which location has the larger carrier amplitude and therefore which is the upstream location. Each unit has a charge switch, two transfer switches in the form of an old pair switch and a new pair switch and a controller for controlling the switches. One of the units closes its charge switch to charge the new pair to the dc level of the old pair. Then, the upstream unit operates its two transfer switches at the same time to switch from the old pair, by opening the old pair switch, to the new pair, by closing the new pair switch. The upstream unit transmits a signal to the downstream unit on a third pair. When the downstream unit receives the signal, it operates its two transfer switches at the same time to complete the transfer from the old pair to the new pair.

REFERENCES:
patent: 3975600 (1976-08-01), Marston
patent: 4186283 (1980-01-01), Simmonds
patent: 4590336 (1986-05-01), Ray et al.
"Special Circuit Transfer System", APC Industries, Inc. 3M, undated, 6 pages.
"831A Special Circuit Transfer System Model 1170" Instruction Manual, Automation Products Company, May 1981, pp. title-57.
"Take It Easy-T1 Protection's Here", by Albert H. Miller, Feb. 1, 1991, Telephone Engineer & Management, pp. 72-78.

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