Cisco ONS 15454 - Figure 12-12 Connecting Fiber to a Four-Node, Four-Fiber BLSR; Table 12-4 Comparison of the Protection Schemes

12-14
Cisco ONS 15454 Reference Manual, R7.0.1
OL-9217-01
Chapter 12 SONET Topologies and Upgrades
12.3 12.3 Comparison of the Protection Schemes
Figure 12-12 Connecting Fiber to a Four-Node, Four-Fiber BLSR
12.3 Comparison of the Protection Schemes
Table 12-4 shows a comparison of the different protection schemes using OC-48 as an example.
61958
Node 1
West East
West East
West East
West East
Slot
5
Slot
12
Node 4
Slot
5
Slot
12
Node 2
Slot
5
Slot
12
Node 3
Slot
5
Slot
12
Tx
Rx
Slot
6
Slot
13
Tx
Rx
Slot
6
Slot
13
Tx
Rx
Slot
6
Slot
13
Tx
Rx
Slot
6
Slot
13
Working fibers
Protect fibers
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 N
1
-
PT
2
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.