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Cisco ONS 15454 Procedure Guide, R5.0
September 2005
Chapter 19 DLPs A200 to A299
DLP-A294 Perform a Manual Span Upgrade on a Four-Fiber BLSR
Note BLSR PCA circuits, if present, will remain in their existing STSs. Therefore, they will be located on the
working path of the upgraded span and will have full BLSR protection. To route PCA circuits on
protection channels in the upgraded span, delete and recreate the circuits after the span upgrade. For
example, if you upgrade an OC-48 span to an OC-192, PCA circuits on the protection STSs (STSs 25 to
48) in the OC-48 BLSR will remain in their existing STSs (STSs 25 to 48) which are working, protected
STSs in the OC-192 BLSR. Deleting and recreating the OC-48 PCA circuits moves the circuits to STSs
96 to 192 in the OC-192 BLSR. To delete circuits, see the “NTP-A278 Modify and Delete Overhead
Circuits” procedure on page 9-4. To create circuits, see Chapter 6, “Create Circuits and VT Tunnels.”
Step 1 Apply a Force switch to both span endpoints (nodes) on the span that you will upgrade first. See the
“DLP-A303 Initiate a BLSR Force Ring Switch” task on page 20-3.
Step 2 Remove the fiber from both working and protect cards at both span endpoints (nodes) and ensure that
traffic is still running.
Step 3 Remove the OC-N cards from both end points.
Step 4 For both ends of the span endpoints, in node view right-click each OC-N slot and choose Change Card.
Step 5 In the Change Card dialog box, choose the new OC-N card type.
Step 6 Click OK.
Step 7 Complete the “NTP-A16 Install the OC-N Cards” procedure on page 2-6 to install the new OC-N cards
in both endpoints.
Step 8 Verify that the transmit signal falls within the acceptable range. See Table 2-3 on page 2-15 for OC-N
card transmit and receive levels.
Step 9 Complete the “DLP-A44 Install Fiber-Optic Cables for BLSR Configurations” task on page 17-52 to
attach the fiber to the cards. Wait for the IMPROPRMVL alarm to clear and the cards to become active.
Step 10 When cards in both endpoint nodes have been successfully upgraded and all the facility alarms (LOS,
SD, or SF) are cleared, remove the forced switch from both endpoints (nodes) on the upgraded span. See
“DLP-A194 Clear a BLSR Force Ring Switch” task on page 18-66.
Step 11 Perform an exercise ring test to check the BLSR ring functionality without switching traffic. See the
“DLP-A217 BLSR Exercise Ring Test” task on page 19-10.
Step 12 Repeat these steps for each span in the BLSR. When all spans in the BLSR have been upgraded, the ring
is upgraded.
Step 13 Return to your originating procedure (NTP).
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