T640 Six-Input Dc Power Supply Description; Power Supply Components; Inputs; Figure 39: Six-Input Dc Power Supply - Juniper T640 Hardware Manual

T640 Six-Input DC Power Supply Description

Copyright © 2013, Juniper Networks, Inc.
Maintaining the T640 Power Supplies on page 194
T640 LED Overview on page 200
Troubleshooting the T640 Power System on page 207
Replacing a T640 Four-Input 240-A DC Power Supply on page 323
Power Supply Components on page 69
Inputs on page 69
Redundancy on page 70

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 39 on page 69 shows the six-input DC power supply.
NOTE: There are no circuit breakers or passive fuses in the router.

Figure 39: Six-Input DC Power Supply

Inputs

The six-input DC power supply inputs are labeled
INPUT 4 , and INPUT 5 , from top to bottom. Each 60 A input consists of –48 VDC and
return.
Table 33 on page 69 describes which components are powered by each input.

Table 33: Components Powered by Each Six-Input DC Power Supply Input

Input
INPUT 0
Chapter 3: T640 Router Hardware Component Overview
INPUT 0
Components
Fan trays
, , ,
INPUT 1 INPUT 2 INPUT 3
,
69