Power Supply Components; Redundancy; Figure 22: Dc Power Supply; Table 56: Components Powered By Each Six-Input Dc Power Supply Input - Juniper T4000 Hardware Manual

T4000 Core Router Hardware Guide

Power Supply Components

Redundancy

76
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 22 on page 76 shows the six-input DC power supply.
The six-input DC power supply inputs are labeled
, and , from top to bottom. Each 60 A input consists of –48 VDC and
INPUT 4 INPUT 5
return.
NOTE: There are no circuit breakers or passive fuses in the router.

Figure 22: DC Power Supply

Table 56 on page 76 describes which components are powered by each input.

Table 56: Components Powered by Each Six-Input DC Power Supply Input

Input
INPUT 0
INPUT 1 through INPUT 5
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
the system. A single power supply can provide full power for as long as the router is
operational. For power management of the T4000 router, see
Management (Three 80-A Cables on a Six-Input DC Power Supply)" on page 103
"T4000 Power Management (Four 60-A Cables on a Six-Input DC Power Supply)" on
page 103.
INPUT 0
Components
Fan trays
FPCs, Routing Engines, control boards, SIBs, craft interface, SCGs,
and other components in the router.
, , ,
INPUT 1 INPUT 2 INPUT 3
"T4000 Power
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