Abstract:
International Telecommunication Union (ITU-T) has
laid down broad principles for the convergence of packet and
optical platforms through a series of Optical Transport Network
(OTN) protocols. Convergence of multiple services in order to use
a common transport layer has emerged as an attractive solution
to bring down the capital expenditure and operational costs. In
this paper an Integer Linear Programming (ILP) model based
on OTN protocol is presented to provide end to end converged
optical transport network while dealing with Synchronous Digital
Hierarchy(SDH) network ,10 Gigabit Ethernet(10GE),40 Gigabit
Ethernet(40GE) and 100 Gigabit Ethernet(100GE) traffic at the
same time. Objective function is defined in terms of the cost of
the links on which the traffic was routed, and further these links
support mixed line rates. The algorithm has also been studied for
evaluating the effect of data grooming and inverse multiplexing
at a node. The port size of packet optical transport platform used
at each node is approximated in terms of the optimal amount
of each type of traffic moving through a node. To reduce the
running times, the ILP model has also been evaluated for a
greedy routine, what we call Highest Rate First (HRF) ordering,
through which the ILP took considerably less time to converge.
