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In this paper, a packet pre-classification MAC protocol based on Carrier Sense Multiple Access with Idle Detection (CSMA/ID) with carrier fragmentation aware scheme has been investigated for completely transporting IP packets over the all-optical WDM ring networks. In order to improve the utilization of the network, the packets are first pre-classified into various class queues of Access Point (AP) according their length. The downstream access point recognizes the incomplete IP packet by the presence of the sub-carrier signal and pulls it off the ring. The carrier-sense can check the Available Channel Length (ACL) to notify the transmission queues transmit the packet.
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