MCDQDB (Multi-channel DQDB) using WDM (wavelength division multiplexing)

Applications such as real-time video/voice service, distributed multimedia database access, and high-resolution image transfer require more bandwidth than is available today. These applications also require a large geographical span. To meet these requirements, we introduce the new protocol, MCDQDB, for a multi-channel dual-bus MAN which is the extension of a single channel DQDB MAN. MCDQDB can be easily implemented with the state-of-the-art WDM technology and conforms to the IEEE 802.6 standard, DQDB, with fairness and access delay improvement. The multiple channels of MCDQDB are made by WDM and the nodes of MCDQDB have fixed transmitters and receivers whose number is equal to the number of channels. Better fairness is obtained by distributing the head-end nodes. For an analysis, we compare MCDQDB with DQDB with a high speed channel. The simulation results show the advantage of MCDQDB in access delay and fairness, compared with the one channel original DQDB and the relation between the number of channels of MCDQDB and the channel speed of DQDB