Apparatus and method for checking time slot integrity of a switc

Details Apparatus and method for checking time slot integrity of a switc Apparatus and method for checking time slot integrity of a switc

1984-05-22

1986-05-27

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

375 10, 371 68, H04J 116, H04J 314, H04B 346, G06F 734

Patent

active

045920443

ABSTRACT:
Apparatus and method are disclosed for checking the time slot data word integrity of data communications in a time multiplexed communication system. A predetermined control bit of each data word of a data frame is alternately switched from its normal control bit function to a bit of a pseudo random sequence (PRS) for time slot data word integrity checking. During alternate data frames a checking circuit compares the predetermined bit of received consecutive data words against consecutive bits of a reference PRS and outputs a time slot cross connect error signal when a difference occurs.

REFERENCES:
patent: 3895349 (1975-07-01), Robson
patent: 3914740 (1975-10-01), Han
patent: 3944800 (1976-03-01), Beck et al.
patent: 3982111 (1976-09-01), Lerner et al.
patent: 4093940 (1978-06-01), Maniere
patent: 4143354 (1979-03-01), Stoddart
patent: 4528661 (1985-07-01), Bahr et al.

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