Chapter 39 Hardware procedures 391
Multiservice Switch 7400 Hardware Installation, Maintenance, and Upgrade 6.1S2
Powering down a Multiservice Switch
Power down a Multiservice Switch when you are doing maintenance
procedures that require all power distribution to be off.
Procedure steps
1 Toggle off the circuit breakers or fuses of the upstream source of power
for the feeds that supply power to the Multiservice Switch.
The front panel LED of each power supply remains lit for approximately
two minutes after the power supply loses power. Capacitors are
discharging while the LED is lit.
If the primary power to the shelf assembly is on, never set the individual
power supply toggles to the standby position. This can cause an overload
to the on-line power supply.
2 After a couple of minutes, verify the LEDs for the power supplies, cooling
unit, and each processor card faceplate are off.
3 Power off the power supplies.
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