Juniper E Series Hardware Manual page 108

ERX 7.0.x Hardware Guide
Figure 45: Installing an SFP on an E-series GE I/O Module
4.
5.
6.
7.
If you are using the redundant port on the GE I/O module, repeat
Steps 2 through 7 for the other port.
92
Replacing SFPs on GE I/O Modules
TX and RX markings on I/O module
Connection circuitry on base of SFP
Insert the SFP as far as you can into the I/O module.
The SFP should slide smoothly into the I/O module and should click into
place. If the SFP does not slide smoothly into the I/O module, check that
the orientation of the SFP is correct.
Gently pull the SFP to confirm that it is inserted correctly.
The SFP should not move when you pull it. If the SFP comes out of the
slot when you pull it, repeat Step 4.
Remove the dust cover that protects the ports.
Connect the new cables to the SFP.