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Chain topology
TM and ADM can configure none-protection chain topology network, and double TMs
and ADM can configure the linear low order VC protection of STM-1 level.
When configured as 1+1 protection mode, service reliability will enhance but access
ability will reduce; and when configured as none-protection mode, access ability will
enhance but service reliability will reduce.
9.3
Ring topology
Network of ring topology is available for distribution of network elements in ring form.
With the feather of line interfaces self closed, service can be transmitted bi-directionally
(east and west), so the network has high reliability and self-healing ability. Showing as
follows:
Ring topology
This topology can establish 2F SNC-P.
2F SNC-P
The advantages of 2F SNC-P are high speed, flexibility and all level capacities. The
switching depends on local environment and has nothing to do with the network topology,
so 2F SNC-P is suitable for all kinds' topologies, especially dynamic network.
The disadvantage of 2F SNC-P is that all the tributaries in the ring are all APS
architectures, that is between any two points, there are two transmission lines
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