Dc Power Supply Description; Figure 22: Dc Power Supply In An Ex9214 Switch - Juniper EX9214 Hardware Manual

EX9214 Switch Hardware Guide

DC Power Supply Description

44
while the switch is operating with one type of power supply, the switch
disables the power supply you installed and generates an alarm.
This topic describes the DC power supplies in EX9214 switches.
DC Power Supply Description on page 44
DC Power Supply Configurations on page 45
The DC power supplies in EX9214 switches are hot-insertable and hot-removable
field-replaceable units (FRUs).
You can install four DC power supplies in an EX9214 switch. Power supplies are installed
at the rear of the chassis in slots
provide full redundancy.
Each DC power supply weighs approximately 15.8 lb (7.2 kg) and has two DC inputs
(–48 VDC and return), each of which requires a dedicated circuit breaker and LEDs to
monitor the status of the power supply.
See Figure 22 on page 44.

Figure 22: DC Power Supply in an EX9214 Switch

Switch
(behind door)
1
0
Weight
warning label
Each power supply has two power inlets: one located at the top of the power supply and
another that requires a dedicated power feed, located directly above the power supply.
If you plan to operate a maximally configured DC-powered switch, we recommend that
you use a dedicated customer site circuit breaker rated for 208 A (104 A per supply)
(–40 VDC) minimum, or one that complies with the by local code.
If you plan to operate a DC-powered switch at less than the maximum configuration, we
recommend that you provision a circuit breaker according to respective National Electrical
through (left to right). Four power supplies
PEM0 PEM3
LED
labels
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