Mx480 Dc Power Supply Leds; Dc Power Supply Electrical Specifications For The Mx480 Router - Juniper MX480 Hardware Manual

MX480 DC Power Supply LEDs

Each DC power supply faceplate contains three LEDs that indicate the status of the power supply (see
Table 19 on page 58). The power supply status is also reflected in two LEDs on the craft interface.In
addition, a power supply failure triggers the red alarm LED on the craft interface.
NOTE: An SCB must be present for the PWR OK LED to go on.
Table 19: DC Power Supply LEDs
Label Color
PWR OK Green
Yellow
BRKR ON Green
INPUT OK Green
Yellow

DC Power Supply Electrical Specifications for the MX480 Router

Table 20 on page 59 lists the DC power supply electrical specifications.
power system specifications.
State Description
Off Power supply is not functioning normally. Check the INPUT OK LED for
more information.
On Power supply is functioning normally.
On The main output voltage is out of range (lower limit: 37.5 V to 39.5 V; upper
limit: 72.5 V to 76 V).
Off DC power supply circuit breaker is turned off.
On DC power input is present and the DC power supply circuit breaker is turned
on.
Off DC input to the PEM is not present.
On DC input is present and is connected in correct polarity.
On DC input is present, but not in valid operating range or connected in reverse
polarity.
Table 21 on page 60 lists the DC
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