Multiplex communications – Wide area network – Packet switching
Patent
1989-01-19
1991-06-11
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 952, H04Q 1100
Patent
active
050238671
ABSTRACT:
A scanning protocol is provided for the scanning of a plurality of serial transmission lines connecting users' devices to the scanning means of a communication device, said lines being coupled to the scanning means through line interface couplers (LICs) having each a wired address (n,n', . . . ) known to the scanning means. This scanning protocol requires that for each LIC configuration, a given LICn having a wired address n be re-addressable with a logical address n' corresponding to the wired address of any other active LICn'. This is done in order to determine, for said LIC configuration, the shortest possible scanning scheme including all the active LICs. The re-addressing of a LICn of wired address n, with a logical address n', includes the steps of: resetting the LICn to be affected a logical address n'; setting the logical address n' into LICn; locking said logical address n' into said LICn, and enabling the lines (26) connected to LICn re-addressed with logical address n'.
REFERENCES:
patent: 3496301 (1970-02-01), Kaenel
patent: 4409683 (1983-10-01), Woodward
patent: 4726017 (1988-02-01), Krum et al.
patent: 4737950 (1988-04-01), Fechalos
patent: 4766590 (1988-08-01), Hamada et al.
patent: 4858230 (1989-08-01), Duggan
Badaoui Mohamed
Dambricourt Richard
Franquenouille Jean-Paul
Garcia Christian
Granger Yves
Chin Wellington
Duffield Edward H.
International Business Machines - Corporation
Olms Douglas W.
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