Cisco GSR12/60 - 12012 Router -AnyLAN, SONET/SDH Installation And Configuration Manual page 217

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The RP sends the instructions to each line card to power up. Each line card processor
begins to perform its own boot process. Each line card, through its MBus module,
notifies the RP when the boot process is complete.
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The RP sends a command to each switch fabric card to power up. As each switch fabric
card powers up, its progress is monitored by its MBus module processor. When the
power-up process is complete, the switch fabric card MBus module notifies the RP that
the switch fabric card is online.
As the boot process progresses for each card, the card's status is displayed in the
alphanumeric LED displays. The top display is powered by the DC-DC converter on the
card; the bottom display is powered by the +5 VDC that powers the MBus module.
By checking the state of the LEDs on the power supplies and the alphanumeric displays on
the RP and line cards, you can determine when and where the system failed in the startup
sequence.
When you start up the system by turning on the power supply power switches, the following
should occur:
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The power supply green input OK (DC-input power supply) or AC OK (AC-input power
supply) LED should go on immediately; it should remain on as long as the system is
receiving source power and the power switch is in the ON (|) position. If this LED does
not go on, or if it goes off while the power switch is still on, there could be a problem
with either the source power, the internal DC voltages (+5 VDC and –48 VDC) that the
power supplies distribute to the internal components, or the cooling subsystem.
The green input OK LED indicates the status of the power supplies and internal
DC voltages. This LED stays on when all of the following conditions are met:
— Power supplies are on and receiving 180 to 264 VAC, 50 to 60 Hz (or –48 VDC to
–60 VDC) source power.
— Power supplies are providing the +5 and –48 VDC to internal components.
— All internal DC voltages are within tolerance.
If the AC (or DC) source power or any of the internal DC voltages exceed allowable
tolerances, the output OK LED will not go on, or will go off shortly after you turn on
the power. Because both the RP (which use +5 and +3.3 VDC), and the blower modules
(which uses –48 VDC) are required for operation, a problem with any of the internal DC
lines can prevent the system from starting up or continuing operation.
Troubleshooting Overview
Troubleshooting the Installation 5-5