Circuit arrangement for testing the operability of the data tran

Details Circuit arrangement for testing the operability of the data tran Circuit arrangement for testing the operability of the data tran

1988-12-07

1989-07-25

Griffin, Robert L.

Multiplex communications

Wide area network

Packet switching

370 321, 379406, H04B 332, H04B 320

Patent

active

048520829

ABSTRACT:
A circuit arrangement is provided for completely testing the operability of a data transmission facility which has a four-wire connected to a two-wire line via a hybrid and in which an echo compensation circuit is connected between the data signal output line and the data signal receiving line of the circuit arrangement. The data signals appearing on the data signal output line are supplied to the hybrid without delay as well as delayed by a fixed time interval which is selected to exceed the longest time leading to a correlation between delayed and undelayed data signals. The echo compensation circuit is driven only with the delayed data signals.

REFERENCES:
patent: 3206559 (1965-09-01), Barney
patent: 3721777 (1973-03-01), Thomas
patent: 4117277 (1978-09-01), van den Elzen et al.
patent: 4355214 (1982-10-01), Levy et al.
patent: 4355406 (1982-10-01), Guidoux
patent: 4539675 (1985-09-01), Fisher
patent: 4549049 (1985-10-01), Guidoux
patent: 4562312 (1985-12-01), Duttweiler
patent: 4571720 (1986-02-01), Chevreau et al.
Publication entitled: "Digital Echo Cancellation for Baseband Data Transmission", IEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-27, No. 6, Dec. 1979, By Niek A. M. Verhoeckx et al., pp. 768-781.

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