Cisco NCS 5501 Hardware Installation Manual page 51

Connect Router to the Network
Step 5 Place the removed SFP module on an antistatic mat, or immediately place it in a static shielding bag if you plan to return
it to the factory.
Step 6
Protect your line card by inserting clean SFP module cage covers into the optical module cage when there is no SFP
module installed.
Hardware Installation Guide for Cisco NCS 5500 Series Fixed-Port Routers
Installing and Removing SFP Modules
43