Symmetricom, Inc.

Symmetrican, Inc.

Sandro Squadrito

Kishan Shenoi

Gary Bogardus

Jeremy Sinclair Sommer

Kamila Kraba

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 in a first direction from a variable gain amplifier at a mid-span extender unit responsive to an input signal in the first direction from the digital subscriber loop; monitoring a signal strength of said output signal in the first direction at the mid-span extender unit; generating a gain control signal responsive to the signal strength at the mid-span extender unit; controlling a gain of the variable gain amplifier at the mid-span extender unit responsive to the gain control signal; and controlling a second gain of a second variable gain amplifier at said mid-span extender unit responsive to said gain control signal to produce an output signal in a second direction from said second variable gain amplifier at said mid-span extender unit responsive to a second input signal in said second direction from said digital subscriber loop.

Long subscriber loops using automatic gain control mid-span extender unit

Systems and methods are described for asymmetric digital subscriber loops. A method includes utilizing a circuit having a first end and a second end, the circuit having a first amplification interface connecting the first end to the second end in a first direction, and a second amplification interface connecting the second end to the first end in a second direction; adapting the first amplification interface to provide a first gain adjustment as a function of a first attenuation of a first communication by a first direction impedance from the transmission medium while transmitting in the first direction, the first communication within a first frequency range over the transmission medium from the first end to the second end; and adapting the second amplification interface to provide a second gain adjustment as a function of a second attenuation of a second communication by a second direction impedance from the transmission medium while transmitting in the second direction, the second communication within a second frequency range over the transmission medium from the second end to said first end. An apparatus includes a modulator for transmitting a first communication, in a first direction over a transmission medium, the modulator operably coupled to a first amplification interface for providing a first gain adjustment, based on a first attenuation of the first communication in the first direction by a first direction impedance of the transmission medium; and a demodulator operably coupled to the modulator, for receiving a second communication, in a second direction over the transmission medium, the demodulator operably coupled to a second amplification interface for providing a second gain adjustment, based on a second attenuation of the second communication in the second direction by a second direction impedance of the transmission medium.

Asymmetric digital subscriber line methods suitable for long subscriber loops

Systems and methods are described for fault detection for subscriber loop repeaters. A method includes monitoring an upstream signal on a digital subscriber loop for a fault detection signal that is added to said upstream signal at a repeater; and determining if a fault has occurred. An apparatus includes a digital subscriber loop fault detection system including: a receiver circuit that monitors an upstream signal on said digital subscriber loop for a fault detection signal that is added to said upstream signal at a repeater; and a logic circuit that determines whether a fault has occurred.

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San Jose, CA, United States of America

Sandro Squadrito