Data transmission test set with synchronization detector

Communications: electrical – Digital comparator systems

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178 691, G08C 2500, H04L 1700

Patent

active

041581938

ABSTRACT:
Data transmission test set used for making error counts and incorporating a new and improved synchronization detector to rapidly detect loss of synchronization between the received data pattern which is supposed to be a psuedo random pattern and the locally generated error free replica psuedo random test pattern. In this system, the received data pattern and a first locally generated psuedo random pattern are used to generate an error pattern which is then used to effect generation of a second local psuedo random comparator pattern.
The second pattern and the error pattern are then used to generate a third pattern, the bits of whichare used to determine if loss of synchronization has or has not occurred. Loss of synchronization is determined almost immediately thus preventing the running error count from being severely affected by loss of synchronization. The detected occurrence of loss of synchronization is used to resync the test set and is also displayed to the test set user.

REFERENCES:
patent: 3305636 (1967-02-01), Webb
patent: 3466601 (1969-09-01), Tong
patent: 3550082 (1970-12-01), Tong
patent: 3562710 (1971-02-01), Halleck
patent: 3571794 (1971-03-01), Tong
patent: 3596245 (1971-07-01), Finnie et al.
patent: 3648237 (1972-03-01), Frey, Jr.
patent: 3733585 (1973-05-01), Merlo
Green and San Soucie, An Erro-Correcting Encoder and Decoder of High Efficiency, Proceeding of IRE, Oct. 1958, pp. 1741-1744.

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