Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
2006-02-14
2006-02-14
Chin, Wellington (Department: 2664)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C370S386000, C370S387000, C370S388000, C370S396000, C370S392000, C370S395320
Reexamination Certificate
active
06999452
ABSTRACT:
A packet-switched network system comprises a multiplicity of multi-port network units each of which has first and second ports and other ports and transmission links coupling the first and second ports of said unit in a closed ring. The first and second ports and transmission links support duplex transmission of Ethernet data packets. Each unit transmits from said first and second ports packets including selected information enabling on reception of a packet at any of the units a determination of a number of hops from unit to unit around said ring said packet has made. Each unit has a forwarding database and in response to the said selected information controls the transmission of said packets in two directions around said ring, and each unit causes discard of packets which have according to said selected information circumnavigated the ring.
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Drummond-Murray Justin A
Moran Paul J
3Com Corporation
Chin Wellington
Ho Chuong
Nixon & Vanderhye P.C.
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