Digital subscriber loop interface unit

Details Digital subscriber loop interface unit Digital subscriber loop interface unit

1994-08-10

1997-04-01

Chin, Wellington

Pulse or digital communications

Equalizers

Automatic

375233, 375232, 36472419, 3647242, H03H 730

Patent

active

056174500

ABSTRACT:
A digital subscriber loop interface unit, connected to a digital subscriber loop, includes an echo canceler for carrying out a echo canceling operation, a decision feedback equalizer for carrying out an equalizing operation, and a transversal filter, provided in at least one of the echo canceler and the decision feedback equalizer, in which a plurality of taps among all taps are grouped into groups, each group including a predetermined number of taps continuously arranged, a single tap coefficient being assigned to the taps in each group. A digital subscriber loop interface unit may include an echo canceler for carrying out a echo canceling operation by using a value obtained by adding +1 to a symbol value represented by a 2B1Q code. Further, the echo canceler may have a jitter echo canceler in which a convolution operation is carried out by using a value obtained by adding +1 to a symbol value represented by the 2B1Q code, the tap coefficient used in the convolution operation is changed in accordance with a time elapsing from occurrence of the jitter. Furthermore, a digital subscriber loop interface unit may have a low-pass filter in which a filter coefficient is changed based on whether the decision feedback equalizer is in or after a pull-in step.

REFERENCES:
patent: 5029167 (1991-07-01), Arnon et al.
patent: 5327459 (1994-07-01), Hara et al.
patent: 5481564 (1996-01-01), Kakuishi et al.
patent: 5493585 (1996-02-01), Leverington et al.

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