Multiplex communications – Wide area network – Packet switching
Patent
1991-01-28
1993-02-23
Safourek, Benedict V.
Multiplex communications
Wide area network
Packet switching
3701001, H04L 1256
Patent
active
051896702
ABSTRACT:
Data packets of mutually equal durations are transmitted from a plurality of substations to a main station via one or more transmission channels. The main station transmits on each transmission channel a synchronizing signal which indicates the beginning of a frame. A programmable memory stores maximum link establishment and maximum link disetablishment times which are characteristic of the transmission channel from the substations to the main station. The substations each comprise a programmable memory for storing the maximum establishment times and disestablishment times. On reception of the synchronizing signal on a transmission channel the substation subdivides the frame into a number of consecutive time slots of mutually equal durations at least equal to the sum of the duration of a data packet, and the stored maximum establishment and disestablishment times of that transmission channel. If desired, the substation selects a time slot from the sequence of time slots and transmits the data packet within the selected time slot, beginning at a time equivalent to the stored maximum link establishment time of that transmission channel after the beginning of the selected time slot, and ending at a time equivalent to the stored maximum link disestablishment time of that transmission channel before the end of the selected time slot.
REFERENCES:
patent: 4777595 (1988-10-01), Strecker
patent: 4821264 (1989-04-01), Kim
patent: 4888767 (1989-12-01), Furuya
patent: 4899333 (1990-02-01), Roediger
patent: 5003534 (1991-03-01), Gerhardt
patent: 5014314 (1991-05-01), Mulford
Safourek Benedict V.
Samuel T.
Treacy David R.
U.S. Philips Corporation
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