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Cisco ONS 15454 DWDM Procedure Guide, R8.0
78-17704-02
Chapter 1 Install the Shelf and Common Control Cards
NTP- G9 Install the Alarm Expansion Panel (ANSI Only)
Figure 1-21 Replace Backplane Screws with Standoffs
Step 2 Attach the remaining two standoffs on either side of the backplane (Figure 1-22). 
Step 3 Position the AEP board over the standoffs.