Cost-effective single-hub WDM ring networks: A proposal and analysis
Computer Networks: The International Journal of Computer and Telecommunications Networking
All-optical WDM multi-rings with differentiated QoS
IEEE Communications Magazine
A summary of the HORNET project: a next-generation metropolitan area network
IEEE Journal on Selected Areas in Communications
RingO: an experimental WDM optical packet network for metro applications
IEEE Journal on Selected Areas in Communications
Resolving the Fairness Issues in Bus-Based Optical Access Networks
IEEE Journal on Selected Areas in Communications
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In Tunable-Transmitter Fixed-Receiver (TT-FR)-based Wavelength Division Multiplexed (WDM) ring topologies, each node is provided with a dedicated wavelength (home channel) for reception, which must be shared by the upstream nodes willing to communicate with it. Thus, to avoid channel collisions, it is necessary to define a Medium Access Control (MAC) mechanism that arbitrates access to a given destination wavelength. This work proposes and analyses a simple MAC mechanism that avoids channel collisions by recirculating traffic on the upstream ring segment where congestion was detected. Essentially, whenever a given node has got any traffic to transmit, it must first block access to in-transit traffic, which is reflected back to the upstream node over a second optical fibre. Such blocked traffic is given a second chance to pass through the congested node after a round segment delay, thus making use of the ring topology as buffering units. This work analyses the performance operation of such a MAC protocol under two policies applied to recirculated traffic: (1) recirculation bypass and (2) recirculation store-and-forward.