Multi-bus real-time message transmitter

Details Multi-bus real-time message transmitter Multi-bus real-time message transmitter

1994-08-19

1996-04-16

Hsu, Alpus H.

Multiplex communications

Wide area network

Packet switching

370 853, 370 859, 3701001, 34082512, H04J 316, H04J 302

Patent

active

055090125

ABSTRACT:
A multi-bus real-time message transmitter including a buffer memory for temporarily storing transmission messages, each of the transmission messages containing transmission time data designating time that the transmission message is to be sent, a plurality of transceivers connected to a plurality of bus lines, respectively, the plurality of transceivers sensing statuses of the corresponding bus lines, outputting the resultant bus line status data, sending the transmission messages stored in the buffer memory to the corresponding bus lines and sending messages received from the corresponding bus lines to the buffer memory, a timer for generating an interrupt signal at a fixed period and counting real-time, and a protocol processor for determining a network status in response to the bus line status data from the plurality of transceivers, setting a time window whenever the interrupt signal is generated by the timer, the time window having a time width different according to the determined network status, and controlling the plurality of transceivers and the buffer memory so that one of the transmission messages containing one of the transmission time data corresponding to the set time window can be sent from the buffer memory to an idle one of the plurality of bus lines through any one of the plurality of transceivers.

REFERENCES:
patent: 4654889 (1987-03-01), Shutterly
patent: 4805169 (1989-02-01), Van Asselt
patent: 4825204 (1989-04-01), Nakamura
patent: 4918690 (1990-04-01), Markkula
patent: 5329528 (1994-07-01), Akai et al.
patent: 5335226 (1994-08-01), Williams

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