| Autor: |
Wayne D. Grover, Anthony Sack, Adil Kodian |
| Rok vydání: |
2005 |
| Předmět: |
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| Zdroj: |
Optical Switching and Networking. 2:72-85 |
| ISSN: |
1573-4277 |
| DOI: |
10.1016/j.osn.2005.06.003 |
| Popis: |
p-cycles offer an approach to protection of optical transport networks which is fully pre-connected and as fast as a ring-based protection but with mesh-like capacity efficiency. As a result, p-cycles are receiving much study and attention. One open question is, however, whether p-cycle network design exhibits a ''threshold hop-limit'' effect corresponding to that aspect of span-restorable mesh networks. To study this question we extend the existing p-cycle network design theory to include the capability of direct restriction of protection path lengths, rather than indirect restriction through cycle circumference limits. A second practical question is how well simple limitation of cycle circumferences serves as a surrogate for a more involved design method of directly asserting a hop (or distance) limit on the maximum length of protection paths. The answers to these questions, and the methods developed to address them, both enhance our ability to design p-cycle networks in which limitations to optically transparent reach (or other hop or distance limitations) can be directly taken into account. The main findings are that p-cycles do exhibit threshold hop-limiting effects at about three or four hops above those in corresponding mesh networks and that cycle limiting is a simple and effective surrogate for direct limitation on path lengths in p-cycle design problems. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect