Juniper EX4100 User Manual

Cooling System and Airow in an EX4100 and
EX4100-F Switch
IN THIS SECTION
Fan Modules | 53
Airow Direcon in EX4100 and EX4100-F Switch Models | 55
EX4100 and EX4100-F Switches with Front-to-Back Airow | 57
EX4100 Switches with Back-to-Front Airow | 64
How to Posion the Switch | 66
Fan Module Status | 67
The cooling system in an EX4100 and EX4100-F switch consists of eld-replaceable fan modules and
built-in fan(s). The airow direcon depends on the fan modules and power supplies installed in the
switch. You can order an EX4100 switch that supports front-to-back airow (air enters through the front
of the switch) or back-to-front airow (air enters through the back of the switch) or an EX4100-F switch
that has built-in fan(s).
Fan Modules
The fan modules are hot-removable and hot-insertable eld-replaceable units (FRUs) installed in the rear
panel of the EX4100 switch. You can remove and replace them without powering o the switch or
disrupng switch funcons.
EX4100 switches ship with two fan modules (1+1 redundancy) installed in the rear panel of the switch.
The fan module slots display numbers 0 and 1 and each slot has a fan icon next to it.
The fan modules are available in two models that have dierent airow direcons:
• Front-to-back, indicated by the label AIR OUT and Juniper Gold handle. The front-to-back airow
direcon means that cold air enters through the front of the switch, and hot air exits through the
back of the switch.
53

Juniper EX4100 Specifications

General

Brand	Juniper
Model	EX4100
Category	Switch
Language	English