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Design and Application of Simple Data Link (SDL) Framing Protocol

Design and Application of Simple Data Link (SDL) Framing Protocol. Simple Data Link (SDL) Protocol. Edge Switch. Edge Switch. Edge Switch. Packet n. Packet 1. Packet 2. I. I. I. H. H. H. Packet 2. Packet n. Packet 1. I. I. I. Core Switch. Core Switch. Core Switch.

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Design and Application of Simple Data Link (SDL) Framing Protocol

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  1. Design and Application of Simple Data Link (SDL) Framing Protocol

  2. Simple Data Link (SDL) Protocol

  3. Edge Switch Edge Switch Edge Switch Packet n Packet 1 Packet 2 I I I H H H Packet 2 Packet n Packet 1 I I I Core Switch Core Switch Core Switch Core Switch OBS Network Egress Switch Ingress Switch IP Packets IP Packets IP Packets H: SDL header I : IP header • SDL can be applied in Optical Burst Switching (OBS) networks. • In OBS network, several input IP packets are aggregated to form a burst packet. Data are switched base on the whole burst packet instead of individual IP packets inside the networks. SDL Framing Payload Burst Header Burstification No Framing protocol • SDL can be used perfectly as the framing protocol for the burst payload. • In burstification, a SDL header is pre-pended onto each IP packet in the ingress OBS switch. In the egress switch, the SDL protocol is performed to provide the reverse burstification.

  4. The packet loss rate analysis in the OBS networks: • Packet loss rate (PLR) = # of loss packet / # of total packet • Case 1: just aggregate multiple IP packet to form a burst packet • reply upon the IP header (16-bit packet-length field) to distinguish each packet boundary in the burst packet. • if the packet-length field incurs more than 1-bit error, the current packet and the following packet are lose. L = packet length (bytes) N: the amount of IP packet in one burst packet eb: the bit error rate H: average hop count between ingress switch and egress switch in OBS network • Eb: the bit error rate in the OBS network = H*eb • The probability of the 16-bit packet-length doesn’t has any error is (1-Eb)16 • the mean value of the number of the packet loss in one burst packet, PLoss = PLR = PLoss/N the network throughput = 1-PLR

  5. Case 2: use SDL technology to delineate the IP packet boundary in one burst packet • We will lost the current IP packet, if the SDL header has error and 16-bit IP packet-length has error. • Assume the false header matching in the payload field is negligible • The probability of loss one IP packet Ploss = [1- (1-Eb)16][1-(1-Eb)32] • the mean value of the number of the packet loss in one burst packet, • the network throughput =

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