Method for extending a parallel data bus

Details Method for extending a parallel data bus Method for extending a parallel data bus

1983-04-15

1986-03-18

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 85, 370 89, 370 94, H04J 312, H04J 302

Patent

active

045773173

ABSTRACT:
A bus extender which accepts data from a parallel data bus and extends the bus by means of a serial link to another parallel bus. The bus extender comprises a local and remote station or terminal, each having a transmit and receive section. A transmit terminal receives a data frame from the parallel bus and decomposes the frame into data and management sub-frames. The local and remote terminals exchange management sub-frames, thereby starting the transmission process. A data sub-frame is then transmitted from the local to the remote station and a management sub-frame is returned from the remote station indicating receipt of the data sub-frame. Other sub-frames may be exchanged for specialized purposes, such as polling and error signalling. Specialized messages may be identified by tagging sub-frames with message codes. At the remote station, the original management and data bits are reassembled into a single data frame with placement of the bits in the same order as originally appeared at the local station. The new frame is then transferred on the data bus with all bits in parallel. The bus extender appears transparent to the two parallel bus sections.

REFERENCES:
patent: 3922486 (1975-11-01), Dejean
patent: 4271506 (1981-06-01), Broc et al.
patent: 4271510 (1981-06-01), Looschen
patent: 4342986 (1982-07-01), Buskirk et al.
patent: 4390969 (1983-06-01), Hayes
patent: 4424514 (1984-01-01), Fennell et al.
patent: 4430651 (1984-02-01), Bryant et al.
patent: 4451886 (1984-05-01), Guest et al.
"Serial Extension of the IEEE-488 Interface Bus," Electronic Product Design, Jul. 1982, pp. 41-43.
"Computer Communications", Denney and Baghdadi, Aug. 4, 1979.

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