Power Architecture - Nortel Passport 15000 Preparation Manual

120 Chapter 4 Power and grounding preparation

Power architecture

241-1501-205 5.2S2
Power is supplied to the Passport 15000 or 20000 by redundant A and B feeds
to the breaker interface panel (BIP). The source of power must be dc that is
provided either directly from the site power plant or from a system of ac
rectifiers, such as an Astec MFA150 power system.
The BIP provides the following functions.
• It is a termination point for large power distribution cables from the
customer dc power source (site plant or rectifiers).
• It provides a means to power down individual incoming dc feeds to allow
safe servicing at an individual shelf.
• It provides low-frequency stability filtering for each input feed. This
ensures that critical damping is achieved and that step load changes will
not result in oscillations on the dc power bus.
• It provides stabilized output power feed connections to the shelf
assembly and cooling units. For example, when set up with the redundant
A and B feeds, either feed can provide power through the BIP to the
whole shelf in a load-sharing mode of operation.
• It provides internal and external alarm collection and propagation.
For each power feed to a shelf, a redundant pair of power interface modules
(PIMs) further filters and interfaces the -48/-60 V dc power to the backplane.
Each control processor (CP) or function processor (FP) also provides
additional high frequency filtering.
In general, the power and ground cabling requirements and guidelines
between a Passport 15000 or 20000 and an MFA150 configuration is the same
as for a dc site power plant unless otherwise specified. For information about
power and ground requirements between an MFA150 and a Passport 15000
or 20000, see
• "Power requirements" (page 121)
• "Preparation for installing power and ground cables" (page 131)
• "Power and ground cabling overview" (page 153)
• "Grounding the frame and communication links" (page 157)