SDH Ring Architectures
This section examines SDH unidirectional and bidirectional ring architectures and examines the differences between two-fiber and four-fiber SDH rings. A comparison is also made between multiplex section (ring) switching versus path (span) switching. SDH provides for three attributes with two choices each, as illustrated in Table 6-13.
SDH Attribute | Value |
---|---|
Fibers per link | 2-fiber 4-fiber |
Signal direction | Unidirectional Bidirectional |
Protection switching | Multiplex section switching Path switching |
Table 6-13 shows various SDH ring configurations that differ in at least one major attribute. The commonly used ring types and topologies are as follows:
Two-fiber subnetwork connection protection ring (two-fiber ...
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