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Cisco ONS SONET TL1 Command Guide, R6.0
Chapter 2 Procedures and Provisioning
2.4.12 Node 2 Configuration Example (Drop and Continue Node)
2.4.12 Node 2 Configuration Example (Drop and Continue Node)
Issue the command ENT-CRS-STSn::STS-5-1&STS-6-1,STS-1-1:CTAG::1WAYDC; on Node 2.
Figure 2-49 Selector Between 5/1/1 and 6/1/1 to 1/1/1
2.4.13 Node 3 Configuration Example (Destination Node)
Issue the command ENT-CRS-STSn::STS-5-1&STS-6-1,STS-1-1:CTAG::1WAY; on Node 3.
Figure 2-50 Selector Between 5/1/1 and 6/1/1 to 1/1/1
2.5 PCA Provisioning
You can provision or retrieve protection channel access (PCA) cross-connections on two-fiber and
four-fiber BLSR topologies at these supported OC rates: OC-12 (two-fiber only), OC-48, and OC-192.
The traffic on the protection channel is referred to as extra-traffic and has the lowest priority level. Extra
traffic will be preempted by any working traffic that requires the use of the protection channel.
In a two-fiber BLSR the extra traffic is provisioned on the upper half of the bandwidth path. In a
four-fiber BLSR the extra traffic is provisioned on the protect fiber. The PCA provisioning feature allows
you to establish the PCA cross-connection on the protection path of the two-fiber BLSR and protection
channel of the four-fiber BLSR only when the query is an explicit request.
There are two PCA connection types: 1WAYPCA and 2WAYPCA. The PCA cross-connection is
provisioned only when the user provides an explicit request using the ENT-CRS-STSp/VT1 commands.
If the cross-connection is a PCA cross-connection, either 1WAYPCA or 2WAYPCA is shown in the CCT
field of the RTRV-CRS-STSp/VT1 command output.
1WAYPCA and 2WAYPCA are only used in the TL1 user interface to provide usability and visibility for
the user to specify a PCA cross-connection type in the TL1 cross-connection commands.
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