Juniper EX4200 Hardware Manual page 209

The uplink module in EX4200 switches is a hot-removable and hot-insertable unit (FRU): You can remove
and replace it without powering off the switch.
NOTE: The packet forwarding process (pfem) restarts and causes traffic loss, if you:
Install an uplink module (SFP, SFP+, or XFP)
Replace an existing uplink module with another uplink module
Change the operating mode of an SFP+ or SFP+ MACsec uplink module (10-gigabit to 1-gigabit
or 1-gigabit to 10-gigabit) installed in the switch
NOTE: If you have set an uplink module port as a Virtual Chassis port (VCP), removing the uplink
module breaks the setting. You must reset the port as a VCP after you replace the module. See
Setting an Uplink Port on an EX Series or QFX Series Switch as a Virtual Chassis Port.
Before you begin removing an uplink module from the switch:
Ensure that you have taken the necessary precautions to prevent ESD damage (see
Electrostatic Discharge Damage" on page
If there are any transceivers installed in the uplink module, remove them before you remove the uplink
module. For instructions on removing transceivers, see
Ensure that you have the following parts and tools available:
Electrostatic discharge (ESD) grounding strap (If a grounding strap is not available, follow the alternative
grounding method described in Step 1 of the following procedure.)
Cross-head screwdriver (provided in the uplink module kit)
An antistatic bag or antistatic mat
To remove an uplink module from the switch:
1. Attach the electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to
the ESD point on the chassis.
If a grounding strap is not available, touch the exposed, bare metal of the switch with the other hand
to ground yourself and the component.
2. Loosen the screws that secure the flip-up door covering the uplink module slot on the front panel of
the switch by using the cross-head screwdriver provided with the uplink module kit and flip the door
upward.
298).
"Remove a Transceiver" on page
"Prevention of
199.
209