Automatic loss control circuit

Details Automatic loss control circuit Automatic loss control circuit

1991-05-23

1993-12-28

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

For line length compensation

379400, 379398, H04M 100, H04M 704

Patent

active

052747034

ABSTRACT:
A circuit is proposed for adjusting the loss provided to loops in digital loop carrier transmission systems. A constant current is supplied to the loop and the resulting voltage is measured to determine the resistance of the loop. This value is fed to a microprocessor with a look-up table which controls a programmable analog/digital converter. The loss at the output of the converter is a stepwise function based on the resistance of the customer loop.

REFERENCES:
patent: 3881066 (1975-04-01), Macrander et al.
patent: 4056688 (1977-11-01), Stiefel
patent: 4320257 (1982-03-01), Warman
patent: 4343971 (1982-08-01), Beene
patent: 4588856 (1986-05-01), Cohen
patent: 4607247 (1986-08-01), Sterling, Jr. et al.
patent: 4727578 (1988-02-01), Molnar
patent: 4779074 (1988-10-01), Whitford et al.
patent: 4791668 (1988-12-01), Pringle
British Telecom Specification, pp. 0601-0605 and FIG. 10, Issue 1, Jan. 1985.
R-TEC Systems, RPI Section 18, Issue 1, Nov. 1987, "RT Plug-In Dual Super POTS With Automatic Trunk Loss Control Channel Unit."

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