Multiplex communications – Wide area network – Packet switching
Patent
1987-01-15
1989-07-04
Griffin, Robert L.
Multiplex communications
Wide area network
Packet switching
375112, 370 13, H04J 307
Patent
active
048457116
ABSTRACT:
A predetermined characteristic of each of incoming plesiochronous component signals in a time-division multiplexing equipment is derived at each stuffing time for transmission in the form of a stuffing bit in a respective stuffed signal to be multiplexed in a resulting signal. In a demultiplexing equipment receiving the resulting signal, the stuffing bit in a respective demultiplexed stuffed signal is sampled and simultaneously the predetermined characteristic of the plesiochronous signal outgoing from the demultiplexing equipment is derived at each unstuffing time. The sampled stuffing bit and the derived predetermined characteristic are compared in order to measure the transmission quality of a digital channel carrying the component signal through the two equipments. The predetermined characteristic is preferably the parity of the signal between two consecutive stuffing and unstuffing times. The results of the comparisons, in the form of error signals relating to the component signals, contribute to locating faults in the two equipments, signalled by a checking unit included in the demultiplexing equipment.
REFERENCES:
patent: 3873773 (1975-03-01), Guy, Jr.
patent: 3987248 (1976-10-01), Platet et al.
patent: 4302839 (1981-11-01), Mueller
Jean-Francois Portejoie et al., "Equipement de Multiplexage Numerique TNM 2-4 et Equipements de Surveillance Associes", Cables & Transmission, No. 2, Apr. 1978, pp. 246-277.
Boutmy Patrick
LeFort Gilbert
Liger Marc
Walraet Jean
Griffin Robert L.
Haseman Marianne
Societe Anonyme de Telecommunications (S.A.T.)
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