Cisco ONS 15454 SDH Specifications Page 208

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4-10
Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
Chapter 4 Maintenance
Card Replacement
Note Traffic can be interrupted when 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, switch it to standby mode as shown in the “Replace an In-Service XC10G Card”
section on page 4-10, the “Replace an In-Service STM-N Card” section on page 4-13, or the
“Replace an In-Service Electrical Card (E1-N-14, DS3i-N-12, or E3-12)” section on page 4-14,
before pulling the card from the node.
Procedure: Replace an In-Service XC10G Card
Caution Hazardous voltage or energy may be present on the backplane when the system is operating. Use
caution when servicing.
Note Resetting an XC10G card can cause a linear 1+1 STM-N protection switch or an MS-SPRing
protection switch.
Note Traffic can be interrupted when 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 XC10G card to standby mode before you
pull the card from the node.
Step 1 Take these precautions before initiating an XC10G card reset to avoid causing a linear 1+1 or
MS-SPRing protection switch:
a. Ensure that the working span is active on the local and remote nodes.
b. Ensure that the working span is carrying error-free traffic without SD alarms or SF alarms.
c. Place a lockout on the protection span before initiating an XC10G reset. In an MS-SPRing, place a
lockout on the East and West node cards adjacent to the XC10G switch node. For example, if you
are switching the XC10G on Node B, place a lockout on the Node A West card and on the Node C
East card. You do not need to place lockouts on Node B. Before setting the lockout, verify that the
MS-SPRing is not switched. Traffic can be lost if the MS-SPRing is switched when the lockout is
set.
<------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.
Step 2 Determine which XC10G card is active. The active card ACT/STBY LED is green. The standby card
ACT/STBY LED is yellow.
Purpose Replacing an in-service XC10G card
Tools/Equipment
Prerequisite procedures
Required/As Needed As needed
On Site/Remote On Site
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