Cisco Cisco ONS 15454 SONET Multiservice Provisioning Platform (MSPP) Fehlerbehebungsanleitung
You can create Synchronous Optical Network (SONET) Data Communications Channel (SDCC) terminations
on the East and West ports. The fiber of the East port must plug into the fiber of the West port on an adjacent
node. Similarly, the fiber of the West port must plug into the fiber of an East port on an adjacent node.
on the East and West ports. The fiber of the East port must plug into the fiber of the West port on an adjacent
node. Similarly, the fiber of the West port must plug into the fiber of an East port on an adjacent node.
If you configure the East to West connections incorrectly (for example, if you configure East to East or West
to West), no error message is displayed. However, traffic fails if the fiber breaks. Traffic fails because the
nodes on either side of the fiber break are unable to switch the traffic that rides the bidirectional working paths
on STSs 1−24 back onto the protect paths on STSs 25−48.
to West), no error message is displayed. However, traffic fails if the fiber breaks. Traffic fails because the
nodes on either side of the fiber break are unable to switch the traffic that rides the bidirectional working paths
on STSs 1−24 back onto the protect paths on STSs 25−48.
In order to avoid errors, use a system to assign BLSR ports. You can make the East port the furthest physical
slot to the right in the 15454, and the West port the farthest physical slot to the left. For example, in Figure 1,
slot 12 is the East port and slot 6 is the West port.
slot to the right in the 15454, and the West port the farthest physical slot to the left. For example, in Figure 1,
slot 12 is the East port and slot 6 is the West port.
The SONET K1, K2, and K3 bytes carry the information that governs BLSR protection switches. Each BLSR
node monitors the K bytes to determine when to switch the SONET signal to an alternate physical path. The K
bytes communicate failure conditions and actions taken between nodes in the ring.
node monitors the K bytes to determine when to switch the SONET signal to an alternate physical path. The K
bytes communicate failure conditions and actions taken between nodes in the ring.
Working and Protect Paths
BLSR rings allocate half of the available fiber bandwidth for protection. STSs 1−24 are allocated to traffic on
the working spans on both fiber paths. STSs 25−48 are allocated to traffic on protection spans on both fiber
paths. Working and protection bandwidths must be equal. You can only provision OC−12, OC−48 and
OC−192 BLSRs.
the working spans on both fiber paths. STSs 25−48 are allocated to traffic on protection spans on both fiber
paths. Working and protection bandwidths must be equal. You can only provision OC−12, OC−48 and
OC−192 BLSRs.
On a normal BLSR ring without a fiber break, STSs 1−24 are used for working traffic on both fiber spans 1
and 2 that travel in opposite directions (see Figure 2):
and 2 that travel in opposite directions (see Figure 2):
Figure 2 Normal BLSR Ring Without a Fiber Break