Installation Manual

Adding a third PSM (–48 V or 220 V AC only) Chapter 3: Low -to -Mid Capacit y Fr ame Expansion Procedures
Adding a third PSM (–48 V or 220 V AC only)
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A third PSM is required when expanding a –48 V DC or 220 V AC UBS Macro BTS
frame from low capacity to mid capacity . The third PSM is for redundancy .
Objective
F or –48 V or 220 V AC only , install the appropriate PSM into slot 3 of the PSM shelf . If
applicable, remove the filler plate that covers slot 3 of the PSM shelf and then install the
appropriate PSM into slot 3.
Required items
Parts
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 .
One of either the following parts is required:
• –48 V DC P ower Supply Module (–48 V DC PSM) — Motorola model STPN4037
• 220 V AC P ower Supply Module (220 V AC PSM) — Motorola model STPN4036
Tools
The following tools are required:
• TORX T25 bit and driver
• T orque driver
3 -20 68P09283A62 -3
PRELIMINARY A UG 2007