Namely, traffic flows with similar QoS profiles
or price points will have to be combined over the same lightpath. Also note that
the decoupled nature of data and control planes in transparent DWDM networks (see
Optical Network Control) can improve overall EoWDM service resiliency, giving them
a measure of immunity to control plane faults.
Finally, optical networking technology offers various other cost savings for EPL services.
From an operational perspective, DWDM systems have smaller footprints and
lower power consumption than equivalent-rate SONET/SDH systems. This provides
very sizeable OPEX reduction at dense co-location sites. Moreover, EoWDM is very attractive
for carriers with existing fiber infrastructures. For example, incumbents can
migrate their entrenched fiber rings by slowly replacing legacy SONET/SDH nodes
with modularized ROADM nodes. These upgrades can be done in a timely, cost-sensitive
manner, where DWDM ports (e.g., filters, ROADM) are initially put in place and later
populated with pluggable Ethernet transceiver modules as demands increase. This accelerates
service delivery and minimizes equipment costs as transponders/transceivers
form the bulk of optical network expenditures.
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