DC Feeds should be provided as follows:
The Shelf, SCRTs and GPS can be powered using a regular telecommunication power supply of -48VDC with a VDC return. The specified voltage range is from -40.5 VDC to -57.0 VDC.
ATCA Shelves
2 supply feeds per shelf. Each supply should be fed from a separate breaker.
GPS
2 supply feeds per shelf. Each supply should be fed from a separate breaker.
SCRT
1 supply feed per SCRT
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Warning! 14 slot Chassis: Although there are fuses in the power entry circuit of the Shelf, the power lines have to be protected on rack level with 80A breakers. 5 slot Chassis: Although there are fuses in the power entry circuit of the Shelf, the power lines have to be protected on rack level with 30A breakers. |
Run 162mm blue and black DC supply and return cables from the 48 volt breakers to the PEM modules and terminate on lugs.
Protect exposed part with a rubber sleeve as shown below. Label as required.
Before applying power to PEM fit the transparent protective cover over the terminals.
Before inserting any blades, turn on the -48V and measure the voltage on the PEMs. If the -48V is connected the wrong way the chassis will not power up.
