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Copyright © 2010, Juniper Networks, Inc.
Figure 23: Three-Input 240-A DC Power Supply
Three-Input 240-A DC Power Supply Inputs
The three-input 240-A DC power supply inputs are labeled
from top to bottom. Each input consists of –48 VDC and return, each with its own 80-A
circuit breaker. The input mode switch on the faceplate allows you to set the DC power
supply to either
or
2–INPUT
and TX Matrix router.
Table 15 on page 45 describes which components are powered by each input.
Table 15: Components Powered by Each Three-Input 240-A DC Power
Supply Input
Input
Three-Input Mode
T640-SIBs, T-CBs, fan trays, Routing
INPUT 0
Engines, and FPCs in slots
FPC1
FPCs in slots
INPUT 1
FPC2
This input is not supported in
INPUT 2
mode.
Three-Input 240-A DC Power Supply Load Sharing and Fault Tolerance
When the 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. Table
16 on page 46 describes the behavior of the power supply if one of the inputs fails.
Chapter 3: TX Matrix Hardware Components Overview
mode.
mode is required for the T640 router
3–INPUT
2-INPUT
and
FPC0
through
FPC7
2–INPUT
,
, and
INPUT 0
INPUT 1
INPUT 2
,
45
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Troubleshooting
