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Optica Publishing Group
  • Optical Fiber Communication Conference and Exposition and The National Fiber Optic Engineers Conference
  • Technical Digest (CD) (Optica Publishing Group, 2005),
  • paper NThP2

How ROADM Technology is Simplifying Network Management

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With the exception of fiber exhaust situations, many carriers have been slow to adopt DWDM in metro networks due the cost and complexity of dealing with this technology. Instead carriers continue to deploy non-WDM point- to-point, stacked SONET rings. While easy to deploy and manage, stacked SONET ADM rings are inherently inefficient. Pass through traffic must be needlessly regenerated multiple times. Stacking boxes in the central office can use up precious space and power. Utilizing and managing multiple physical rings is cumbersome at best. In addition, an ADM ring is a shared resource. While a 2.5G or 10G ADM ring sounds like high capacity, actual protected bandwidth per node is only 1/N on average - where N is the number of nodes in the ring. For a 16 node, OC-48 UPSR ADM ring, the usable per node bandwidth is only 155MB/s (a single OC-3). For high capacity routes, multiple rings must be overlaid. Thus, fiber pairs, once thought to be an infinite resource, are quickly being used up.

© 2005 Optical Society of America

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