Title:
LONG SUBSCRIBER LOOPS USING AUTOMATIC GAIN CONTROL
Document Type and Number:
WIPO Patent Application WO2001082496
Kind Code:
A3
Abstract:
Systems and methods are described for long subscriber loops using automatic gain control. A method includes extending a digital subscriber loop including: producing an output signal from said first variable gain amplifier responsive to an input signal from said digital subscriber loop; monitoring a signal strength of said output signal; generating a gain control signal responsive to said signal strength; and controlling a gain of said variable gain amplifier responsive to said gain control signal. An apparatus includes a digital subscriber loop extender circuit including: a variable gain amplifier having a gain and providing an output signal in response to an input signal from a signal generator over a transmission medium, said output signal having a signal strength as a function of said gain; and a controller coupled to said variable gain amplifier, said controller generating a gain control signal that is fed back to said variable gain amplifier to automatically control said gain.
Inventors:
SOMMER JEREMY (US)
SHENOI KISHAN (US)
KRABA KAMILA (US)
SQUADRITO SANDRO (US)
BOGARDUS GARY (US)
SHENOI KISHAN (US)
KRABA KAMILA (US)
SQUADRITO SANDRO (US)
BOGARDUS GARY (US)
Application Number:
PCT/US2001/040623
Publication Date:
May 10, 2002
Filing Date:
April 26, 2001
Export Citation:
Assignee:
SYMMETRICOM INC (US)
SOMMER JEREMY (US)
SHENOI KISHAN (US)
KRABA KAMILA (US)
SQUADRITO SANDRO (US)
BOGARDUS GARY (US)
SOMMER JEREMY (US)
SHENOI KISHAN (US)
KRABA KAMILA (US)
SQUADRITO SANDRO (US)
BOGARDUS GARY (US)
International Classes:
H04B3/06; H04L25/24; (IPC1-7): H04B3/38; H04L27/26
Foreign References:
| EP0338804A1 | 1989-10-25 | |||
| US5617450A | 1997-04-01 | |||
| US4606043A | 1986-08-12 |
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