Abstract
This paper examines the economic viability of two technologies—optical
circuit-switched (OCS) networks and optical burst-switched (OBS) networks—in
the core network. We analyze and dimension OCS network (OCSN) and OBS network
(OBSN) architectures for a range of traffic demands given the constraints
on the network element capacities. We investigate the effect of traffic grooming
for both of these architectures. We evaluate these network architectures for
a national core network in Australia in terms of their capital costs and packet-blocking
probabilities. We observe that OBSNs with traffic grooming at the optical
layer may become more cost effective than OCSNs with traffic grooming at both
the IP and optical layers for the same quality of service in terms of blocking
probability. The cost advantage of OBSNs over OCSNs grows as the capacity
of the core network increases. Hence, among the all-optical networking options
that do not involve buffering at the core, OBS appears to be an attractive
option especially for high-capacity core networks.
© 2009 IEEE
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