Contention Resolution
In OCS, each traffic flow is supplied with the appropriate network resources, precisely
with the necessary bandwidth. Therefore, flows would not contend for the same network
resources in the core nodes of an OCS network. However, contention is a major problem in
both OPS and OBS, which are based on multiplexing gain between the traffic flows. Typically,
in electronic packet switching, this problem is solved using random access electronic
buffers; however, this solution is far from being feasible in all-optical networks where
optical buffering is yet to be a viable technology. In OBS, contention occurs when two or
more bursts are destined to use the same channel from the same fiber (i.e., output port) at
the same time. The contention can be resolved in one of three techniques. The contending
burst can be optically delayed/buffered (time domain), converted to another channel in the
same fiber (optical domain), or deflected to another output port (space domain).
Abdelouahab, Abbou, Tat, & Ta b
Copyright ?© 2007, Idea Group Inc. Copying or distributing in print or electronic forms without written permission
of Idea Group Inc. is prohibited.
??? Buffering: One of the most prevailing factors that have motivated the development
of OBS network is the immaturity of the optical buffering technology.
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