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Performance of an edge-to-edge protocol in a simulated X.25/X.75 packet network

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1 Author(s)
Brady, P.T. ; Bell Commun. Res., Red Bank, NJ, USA

Roundtrip message response time was measured on a simulated packet network subjected to message traffic from interactive users. The links had impairments of errors and propagation delay. Each virtual circuit had its own edge-to-edge protocol. With no link-level protocol in place, the edge-to-edge protocol yielded good performance, provided that the edge-to-edge timeout threshold accounted for network delays due to packet queuing. A link-level protocol with too small a window (such as three) caused excessive network congestion and was worse than no link-level protocol at all. With a sufficient window, the link protocol offered an improvement under high-error conditions with light loads, but the improvement lessened as the load increased

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Selected Areas in Communications, IEEE Journal on  (Volume:6 ,  Issue: 1 )