Abstract
Increasing the capacity of optical networks raises the issue of cost
optimal bitrate migration into existing infrastructures. In this paper, we
use the migration from 10G to 40G services as an example. 10G demands can be
groomed into 40G channels or transmitted natively, reducing reach of
concurrently mixed 40G channels. We study the migration scenario from a
networking point of view, optimizing the migration strategy in terms of
capital expenditures. For a lower and an upper cost bound, we apply the two
multiperiod planning approaches: all-periods planning and incremental
planning, respectively. The migration optimization shows considerable impact
from forecast knowledge to cost optimality, channel mix, and aggregation
decisions. The impact of the topology dimension on migration strategy and
overall costs are investigated for a USA and a British network. For
long-term migration under traffic growth, optimal network cost is achieved
by early investments in 40G-only equipment—a conclusion that
applies to both network topologies.
© 2009 IEEE
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