Cisco ONS 15454 SDH Specifications Page 212

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4-14
Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
Chapter 4 Maintenance
Card Replacement
Note An electrical card reset can cause a linear 1:1 or 1:N protection switch or an MS-SPRing protection
switch.
Note Traffic can be interrupted if you pull an active card from the ONS 15454 SDH. Use caution when
replacing cards and verify that only inactive or standby cards are being replaced. If an active card
needs to be replaced, follow the procedure to switch the electrical card to standby mode before you
pull the card from the node.
The cards should be replaced when the red FAIL LED appears.
Take these precautions before performing an electical card reset to avoid causing a linear 1:1, 1:N or
MS-SPRing protection switch:
Step 1 Ensure that the working span is active on the local and remote nodes.
Step 2 Ensure that the working span is carrying error-free traffic without SF alarms.
Step 3 Place a lockout on the protection span before initiating an electrical card reset. In an MS-SPRing, place
a lockout on the East and West cards of the nodes adjacent to the electrical card switch node; for
example, to switch the electrical card on Node B, place the lockout on the West card of Node A and on
the East card of Node C. No lockout is necessary on Node B. Before the lockout is set, verify that the
MS-SPRing is not switched. Traffic can be lost if a lockout is set when the MS-SPRing is switched.
<------East [Node A] West------East [Node B] West------East [Node C] West------>
In a 1:1 protection scheme, place a lockout on the protect card and verify that traffic is traveling over
the working span before setting the lockout.
Procedure: Replace an In-Service Electrical Card (E1-N-14, DS3i-N-12, or E3-12)
Caution Hazardous voltage or energy may be present on the backplane when the system is operating. Use
caution when servicing.
Step 1 Determine which electical card is active. The active card ACT/STBY LED is green. The standby card
ACT/STBY LED is yellow.
Note You can determine whether the card is in active mode or standby mode by viewing it in the
CTC software and positioning the cursor over the card graphic to display the status.
Purpose Replacing an in-service electrical card
Tools/Equipment
Prerequisite procedures
Required/As Needed As needed
On Site/Remote On Site
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