Circuit arrangement for a module in the exchange of a digital TD

Details Circuit arrangement for a module in the exchange of a digital TD Circuit arrangement for a module in the exchange of a digital TD

1988-06-22

1989-07-25

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

Hybrid circuit

379410, 370 321, H04B 320

Patent

active

048521590

ABSTRACT:
A circuit arrangement for a module in the line-connection section of a digital time-multiplex telecommunication network is disclosed. The module contains, among other things, a transverse filter to perform a two-wire/four-wire conversion and is connected through a transformer to the wires of a subscriber line. In order to compensate for phase distortions caused by reflection of signals from the transformer back to the module, the corresponding signals coming from the module are subjected to an equal and opposite phase pre-distortion. This optimizes the hybrid circuit attenuation.

REFERENCES:
patent: 4628157 (1986-12-01), Chance et al.

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