Bims Distributing Power To Pims - Nortel Passport 15000 Hardware Description

56 Chapter 2 Breaker interface panel

BIMs distributing power to PIMs

241-1501-200 5.2S2
For a Passport 20000, each BIM with PEC AP6C67PA supports a maximum
of five PCB-mount circuit breakers made up of four 25-A shelf breakers and
one central 5 A cooling unit breaker. See the table "Circuit breaker
configuration for each BIM of a Passport 15000 or 20000" (page 55). The
position of the breaker is relative to facing the front of the BIP.
Although the breakers of BIMs for a Passport 20000 are higher than those of
a Passport 15000, the maximum power input feed is 100 A for either type of
switch. When having a Passport 15000 and 20000 in the same frame, observe
the criteria in "Combined BIM pairs in a BIP" (page 60).
The power breakers are arranged such that each Passport 15000 can draw
power from two independent power sources (usually labelled A and B). See
"Function of the BIP backplane power input connections" (page 74) for a
summary of the BIP power breaker functions. Breakers should be set to off
before a BIM is removed from the BIP. One BIM receives an input power feed
for a shelf, so that two BIMs are required for each shelf.
Each breaker interface module (BIM) receives power redundantly from the
site power source through separate feeds, labelled A and B. Since the PIMs
receive their power from the BIMs, each pair of PIMs per shelf also has an A
and B feed. Each pair of PIMs is referred to as a rear upper (RU) or rear lower
(RL) behind slots 7 and 15 to correspond to its position at the rear of the shelf.
The five breakers in each BIM are referred to as breakers 1 to 5 counting from
the left. Refer to the figures:
• "Relationship between feeds, breakers, and equipment slots in upper
shelf" (page 57)
• "Relationship between feeds, breakers, and equipment slots in lower
shelf" (page 58)
The BIP breakers that control specific PIMs are identified in the figure "Cable
paths of PIMs at the rear of a NEBS 2000 frame" (page 59).