Juniper T4000 -, Hardware Manual

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Table 17: Supported Power Supplies
First Supported Junos OS
Release
Model Number Name
12.1 PWR-T-6-60-DC Six-input DC power supply
Power Supply Components
Each six-input DC power supply weighs approximately 39.7 lb (18.0 kg) and consists of
six inputs, two blowers, a front and side air filter, and LEDs to monitor the status of the
power supply. Each power supply is cooled by its own internal cooling system.
Figure 23 on page 44 shows the six-input DC power supply.
The six-input DC power supply inputs are labeled INPUT 0 , INPUT 1 , INPUT 2 , INPUT 3 ,
INPUT 4 , and INPUT 5 , from top to bottom. Each 60 A input consists of –48 VDC and
return.
NOTE: There are no circuit breakers or passive fuses in the router.
Figure 23: DC Power Supply
g006351
Table 18 on page 44 describes which components are powered by each input.
Table 18: Components Powered by Each Six-Input DC Power Supply Input
Components Input
Fan trays INPUT 0
FPCs, Routing Engines, control boards, SIBs, craft interface, SCGs,
and other components in the router.
INPUT 1
through
INPUT 5
Redundancy
When the T4000 router is operating normally and both power supplies are switched on,
load sharing between them occurs automatically. When one power supply fails or is
turned off, the other power supply immediately assumes the entire electrical load for
Copyright © 2013, Juniper Networks, Inc. 44
T4000 Router Hardware Guide