Multiplex communications – Wide area network – Packet switching
Patent
1981-09-01
1983-08-09
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 67, H04J 302, H04Q 1104
Patent
active
043982875
ABSTRACT:
In a PAM bus switching bus which normally handles analog voice signals, the different DC offsets caused by the different buffing, summing and distribution amplifiers cause no ill effects because DC voltages are not passed by the remainder of the support elements. However, when it is attempted to switch logic level DC signals through such a PAM bus network, the DC offset which is an indeterminate function of the particular switching path established, makes it impossible to establish a uniform slicing level. In the illustrative embodiment a uniform slicing level is achieved by clamping the summing bus of the PAM system during a preamble of the time slot, measuring the offset on the distribution bus and then applying the measured offset to compensate the distribution bus during the remainder of the time slot when the actual data signal is allowed to be applied to the summing bus.
REFERENCES:
patent: 3652800 (1972-03-01), Dooley
patent: 3934091 (1976-01-01), Stidham
IBM Technical Disclosure Bulletin, vol. 18, No. 1, Jun. 1975, pp. 11-13, "Automatic Zero Correction Technique".
Bell Telephone Laboratories Incorporated
Olms Douglas W.
Popper H. R.
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