Multiplex communications – Wide area network – Packet switching
Patent
1987-09-23
1989-05-30
Safourek, Benedict V.
Multiplex communications
Wide area network
Packet switching
370 24, H04B 156, H04L 514
Patent
active
048357642
ABSTRACT:
With the two-wire time-division multiplex method the directional separation is achieved in that transmission and reception does not take place simultaneously, but alternately on both sides of the transmission path. For bit-by-bit transmission as well as transmission in bursts, the attainable range depends on the signal delay time on the line. To increase the maximum permissible line length when utilizing the two-wire time-division multiplex method, a compensation of the signal delay time in the substation results from the fact that a signal transmission from the substation to the central station is not effected in the second half of the period of the transmission clock pulse, but already as early as in the first half of the bit clock period. The beginning of the signal transmission can be determined, for example, as a function of the measured line length or as a function of pre-set time intervals which are different for the signal transmission in the two directions.
REFERENCES:
patent: 3974339 (1976-08-01), Lutz et al.
patent: 4049908 (1977-09-01), Knorpp et al.
patent: 4476558 (1984-10-01), Arnon
patent: 4514840 (1985-03-01), Bader et al.
Heinlein Hans-Jurgen
Sulzbacher Norbert
Chin Wellington
Eason Leroy
Safourek Benedict V.
U. S. Philips Corporation
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