SH12 Shelf
If you are installing the SH12 in a cabinet, a single, populated SH12
needs a minimum of 750 CFM. See Supported Rack Requirements
for important supported installation features and requirements.
l Clearance Requirements
l Heat Dissipation
l FTM-2
l Air Filter Pads
Power
A centralized power supply architecture is supported. The PSM-DCs convert the external
DC power to internal 12 VDC which is distributed to all modules via the backplane.
The PSM-DCs work in a redundancy configuration, supplying the required power to the
shelf in a load-sharing mode. If one of the PSM-DCs fails, the remaining PSM-DCs
continue supplying power to the entire shelf. This action enables the replacement of the
failed PSM-DC.
The following redundant configurations are supported:
l 1+1 — Two PSM-DCs (slots 35 and 38)
l 2+1 — Three PSM-DCs (slots 35, 36, and 38)
l 3+1 — Four PSM-DCs (slots 35 through 38)
The SH12 also supports the following non-redundant configurations:
l 1+0 — One PSM-DC (slot 35)
l 2+0 — Two PSM-DCs (slots 35 and 38)
l 3+0 — Three PSM-DCs (slots 35, 36, and 38)
Shelf power is provided by –48 VDC input from redundant A and B battery feeds. The
power feeds are located on the bottom front of the SH12. Each power supply has its own
A and B backplane feed. Each input feed has its own –48 V fail detection.
The power feed module (PFMF) is used when the SH12 is configured for front DC
operation. It is a passive module that connects the –48 VDC at the front of the shelf to the
backplane. It contains additionally passive power filters for the –48 VDC.
l DCPower Source Requirements
l General Power and Grounding Guidelines
l Electrical Safety Guidelines and Warnings
l PSM-DC
28 FSP3000 C Hardware Guide - R1.1 - Issue:A (12/09/2016)
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