12-18
Cisco ONS 15454 Reference Manual, R7.0
78-17191-01
Chapter 12 SONET Topologies and Upgrades
12.4 12.4 Comparison of the Protection Schemes
Figure 12-16 Integrated BLSR DRI on the Edit Circuits Window
12.4 Comparison of the Protection Schemes
Table 12-4 shows a comparison of the different protection schemes using OC-48 as an example.
Table 12-4 Comparison of the Protection Schemes
Topology
Ring
Capacity
Protected
Bandwidth
Between
Any Two
Nodes
Protection
Channel
Access
Dual
Failure Number of Cards
Path Protection 48 - PT STS 1-48 Not
supported
Not
supported
2 x N
Two-Fiber BLSR 24 x N1 -
PT2
STS 1-24 STS 25-48 Not
supported
2 x N
Four-Fiber BLSR 48 x N - PT STS 1-48
(Fiber 1)
STS 1-48
(Fiber 2)
Supported 4 x N
Two-Fiber BLSR DRI 24 x N - PT STS 1-24 STS 25-48 Supported (2 x N) + 4
Path Protection DRI 48 - PT STS 1-48 Not
supported
Supported (2 x N) + 4
1. N equals the number of ONS 15454 nodes configured as BLSR nodes.
2. PT equals the number of STS-1 circuits passed through ONS 15454 nodes in the ring (capacity can vary depending on the
traffic pattern).