March 2004
Intermediate to advanced
840 pages
21h 45m
English
Content preview from Optical Network Design and Implementation
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SONET Ring Architectures
This section examines SONET unidirectional and bidirectional ring architectures and examines the differences between two-fiber and four-fiber SONET rings. A comparison is also made between line (ring) switching versus path (span) switching. SONET provides for three attributes with two choices each, as shown in the Table 5-10.
| SONET Attribute | Value |
|---|---|
| Fibers per link | Two-fiber |
| Four-fiber | |
| Signal direction | Unidirectional |
| Bidirectional | |
| Protection switching | Line switching |
| Path switching |
Table 5-10 shows various SONET ring configurations that differ in at least one major attribute. The commonly used ring types and topologies are as follows:
Two-fiber unidirectional path-switched rings (two-fiber UPSRs)
Two-fiber ...
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