Method and apparatus for automatically detecting and measuring distortion in a DSL system
AssigneeParadyne Corporation
InventorGordon Bremer
Life of this patent
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Abstract
In a communications environment where it is desirable to allow the simultaneous transmission of digital subscriber line (DSL) signals and conventional Plain Old Telephone Service (POTS) signals on a single two-wire communication line, a method and apparatus is configured to automatically measure the distortion caused by a telephone or other attached device such as a dial modem due to the presence of a DSL signal on the same communication line. The method and apparatus of the present invention allows DSL devices and POTS devices to be used on the same communication line without the use of a splitter.
Claims19
A method for determining distortion on a communication channel to which is connected at least one conventional Plain Old Telephone Service (POTS) device and at least one digital subscriber line (DSL) device, comprising the steps of:
- varying an output signal of a first DSL device by gating said output signal on and off according to a time sequence to produce a time-varied DSL signal on the communication channel;
- measuring an audio frequency band distortion on the communication channel;
- and
- correlating the audio frequency band distortion on the communication channel to the time sequence of the time-varied DSL signal.
An apparatus for determining distortion on a communication channel to which is connected at least one POTS device and at least one DSL device, comprising:
- means for varying an output signal of a first DSL device by gating said output signal on and off according to a time sequence to produce a time-varied DSL output signal on the communication channel;
- means for measuring an audio frequency distortion on the communication channel;
- means for coupling said measuring means to said varying means;
- and
- means for correlating the measured audio frequency distortion with the time sequence of said time-varied DSL output signal.
A computer readable medium having a program for determining distortion on a communication channel to which is connected at least one POTS device and at least one DSL device, the program comprising:
- means for varying an output signal of a first DSL device by gating said output signal on and off according to a time sequence to produce a time-varied DSL signal on the communication channel;
- means for measuring distortion on the communication channel in the audio frequency band;
- and
- means for correlating the distortion measured by said measuring means with the time sequence of said time-varied DSL signal.
Dependencies are inferred from the claim text.