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Methods and apparatus for interconnecting local area networks with wide area backbone networks

  • US 5,426,637 A
  • Filed: 12/14/1992
  • Issued: 06/20/1995
  • Est. Priority Date: 12/14/1992
  • Status: Expired due to Term
First Claim
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1. An interconnection system for interconnecting a plurality of local area data communications networks by means of a single wide area point-to-point data communications network, said wide area data communications network using the open systems interconnection layered protocols including a network layer and a data link layer, said interconnecting system comprisinga plurality of access nodes in said wide area network for accessing said wide area network from a plurality of local area networks,means in each of said access nodes for receiving a signaling frame in said network layer from an originating one of said local area networks and intended for a destination one of said local area networks,means in the network layer in each of said access nodes responsive to said signalling frame receiving means for determining if said destination local area network has transmission protocols compatible with the transmission protocols at said originating local area network,means in each of said access nodes responsive to said means in the network layer for adjusting data frames from one of said local area communications networks, the adjustment being at least in part a function of an output from said means in the network layer, to permit transmission through said wide area network, andmeans in the data link layer in each of said access nodes responsive to said adjusting means for forwarding adjusted data frames across said wide area network.

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