System for transferring messages via different sub-networks by c

Details System for transferring messages via different sub-networks by c System for transferring messages via different sub-networks by c

1995-07-06

1998-04-14

Lee, Thomas C.

Multiplex communications

Wide area network

Packet switching

3952003, 3952006, 39520062, 39520066, 370360, 370386, 370392, G06F 1300

Patent

active

057403740

ABSTRACT:
A transmission system for sub-networks having different transmission protocols. Control codes which are assigned to a message in a source sub-network are converted at the transition with a first intermediate sub-network, into reference codes which are compatible with a reference protocol ("meta protocol"). Subsequently, control codes are assigned both to the message and to its reference codes, which control codes are compatible with the protocol in the first intermediate sub-network. At each subsequent sub-network transition, control codes are always assigned to both the message and to the reference codes, which control codes are compatible with the local protocol of the subsequent intermediate sub-network ("tunnelling"). At the interface of the last intermediate sub-network and the destination sub-network, after removing the local control codes, the reference codes are converted into control codes which are compatible with the local protocol of the destination sub-network. In this manner "tunnelling" is possible with different protocols in source and destination sub-network. In this context, the number of translation modules is restricted.

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G. Varghese et al; "Transparent Interconnection of Incompatible Local Area Networks Using Bridges"; Jan. 1990; pp. 42-48; IEEE Journal on Selected Areas in Communications, vol. 8, No. 1.
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