Abstract
Buffers are essential components of any packet switch for resolving
contentions among arriving packets. Currently, optical buffers are composed
of fiber delay lines (FDL), whose blocking and delay behavior differ drastically
from that of conventional RAM at least two-fold: 1) only multiples of discrete
time delays can be offered to arriving packets; 2) a packet must be dropped
if the maximum delay provided by optical buffer is not sufficient to avoid
contention, this property is called balking. As a result, optical buffers
only have finite time resolution, which may lead to excess load and prolong
the packet delay. In this paper, a novel queueing model of optical buffer
is proposed, and the closed-form expressions of blocking probability and mean
delay are derived to explore the tradeoff between buffer performance and system
parameters, such as the length of the optical buffer, the time granularity
of FDLs, and to evaluate the overall impact of packet length distribution
on the buffer performance.
© 2009 IEEE
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