Redundancy; T640 Six-Input Dc Power Supply Leds; Table 34: Six-Input Dc Power Supply Leds - Juniper T640 Hardware Manual

T640 Core Router Hardware Guide
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T640 Six-Input DC Power Supply LEDs

70
Table 33: Components Powered by Each Six-Input DC Power Supply
Input (continued)
Input
through
INPUT 1 INPUT 5

Redundancy

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.
T640 Six-Input DC Power Supply LEDs on page 70
Troubleshooting the T640 Power System on page 207
Replacing a T640 Six-Input DC Power Supply on page 329
T640 DC Power Supply Electrical Specifications on page 428
LEDs on each six-input DC power supply faceplate indicate the status of the power
supply. In addition, a power supply failure triggers the red alarm LED on the craft interface.
Table 34 on page 70 displays the power supply LEDs.

Table 34: Six-Input DC Power Supply LEDs

LED Color
Green
INPUT
—One
PRESENT
per input
DC OK —One per Blue
power supply
Yellow
OVER
TEMP —One per
power supply
Components
FPCs, Routing Engines, control boards, SIBs, craft interface, SCGs,
and other components in the router.
State
On steadily
Off
On steadily
Blinking
On steadily
Off
Description
Input is receiving voltage.
Input voltage is not present.
When all inputs are properly
energized, the LED indicates
DC OK
that the power supply is functioning
normally.
Either the power supply is starting
up, or it is not functioning, not
properly installed, or not operating
properly.
Power supply has exceeded
recommended temperature.
Power supply is within the
recommended temperature or the
power supply is not on.
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