Nortel Passport 15000, Hardware Installation And Maintenance, Page: 646 / 874

646 Chapter 17 Hardware procedures
241-1501-240 5.2S2
• You must be familiar with “Safety considerations and best practices”
(page 53).
• Prepare the far-end traffic for the impact of taking one or two
Passport 15000 or 20000 nodes out of service.
• Switching off the breakers in sequence protects the equipment from
damage.
Procedure steps
1 Locate the BIM to be powered off.
When powering down an entire Passport 15000 or 20000 node, locate the
mate BIM for the switch.
2 Switch off each breaker one at a time from left to right, excluding the
middle breaker. Switch off a breaker by pressing in the O symbol.
3 When the mate BIM is also to be powered down, switch off each breaker
one at a time from left to right, excluding the middle breaker.
4 When two nodes are to be powered down, repeat step 1 to step 3.
5 When the entire BIP is powered down to enable work on switch hardware
units (for example, removing a shelf assembly), wait 10 minutes for the
fans to continue cooling down the unpowered circuit cards.
6 Switch off the middle breakers one at a time from left to right. The fan
blades in the cooling units take a while to slow down.
When all BIM breakers off and the input feeds are still powered to the BIP,
the BIM LEDs are still lit.
7 Check the status LEDs of all plug-ins of the shelf assembly. Ensure that
no LEDs are lit on:
• both CPs and all FPs at the front
• the 2 fabrics at the rear
• the 4 PIMs at the rear of a Passport 20000 (a Passport 15000 does
not have PIM LEDs)