Communication control apparatus

Multiplex communications – Pathfinding or routing – Switching a message which includes an address header

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Details

370426, 3408255, H04J 302

Patent

active

058547916

ABSTRACT:
The communication control apparatus can suppress the maximum cell intervals and further enables the simultaneous transmit decision processing for a plurality of the virtual lines. A communication control apparatus used for asynchronous communication executed by setting a transmit enable time at which data can be transmitted to each of a plurality of virtual lines, and by deciding the virtual lines having transmissible data on the basis of the transmit enable times comprises: a time comparing section (1) for comparing the transmit enable times set to a plurality of the virtual lines having transmissible data, respectively with transmit decision time at the same time, to generate comparison result signals; a flag holding section (3) for holding the comparison result signals generated by the time comparing means for each of a plurality of the virtual lines, and erasing the held comparison result signal of a predetermined virtual line in response to a clear signal; and a priority deciding section (5), when a plurality of data-transmissible comparison result signals are held in the flag holding means at the same transmit decision time, for deciding priority sequence of the virtual lines corresponding to the comparison result signals on the basis of rewritable priority flags decided for each of a plurality of the virtual lines to decide one of the virtual lines to be transmitted, and for outputting a clear signal to the flag holding means to erase the comparison result signal of the decided virtual line.

REFERENCES:
patent: 5164939 (1992-11-01), Shobatake
patent: 5497371 (1996-03-01), Ellis et al.
patent: 5689508 (1997-11-01), Lyles

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