Installation Instructions

P ower Supply Modules (PSMs) Chapter 10: PSM Shelf R eplacement Procedures

Power Supply Modules (PSMs)

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PSM Descriptions

Up to three PSMs can be housed in the PSM shelf . A minimum of two PSMs are equipped for

redundancy . An empty PSM 3 slot is covered with a ﬁller panel. Refer to Figure 1 -15 –48 V DC

and 220 V AC PSM shelves front panel detail on page 1 - 46 .

There are two types of PSMs that can be used with the UBS Macro BTS PSM shelf . These

are as follows:

• –48 V DC PSM

• 220 V AC PSM

The –48 V DC PSMs are only used in a –48 V DC PSM shelf .

The 220 V AC PSMs are only used in a 220 V AC PSM shelf .

Nev er plug a –48 V DC PSM into a 220 V AC PSM shelf .

Nev er plug a 220 V AC PSM into a -–48 V DC PSM shelf .

10 -16 68P09283A64 -3

FOA SEP 2007