11990-704/705/706/707 (2-Slot ATCA Shelf)
Power
17
R1.2, March 2018
8 Power
The shelf supports AC- and DC-Power Entry Modules (PEMs). Both PEMs have the same
interface to the shelf.
8.1 AC PEM
Two pluggable redundant AC Power Entry Modules (PEM) are located at the rear top side of
the Shelf. The power input is provided by an AC mains/line module with IEC 320-C14
connector and mains switch. The output voltage of the AC PEM is 48 VDC. Overcurrent
protection is provided by a 40 A fuse in the output branch.
Figure 11: AC PEM
5
Hazardous voltage!
Before working ensure that the power is removed from the power connection
cables.
The AC-PEM can be powered with 230 VAC line voltage. The specified voltage range is
from 180 VAC to 265 VAC .The Shelf supports redundant power inputs but the two in-
puts should be independently powered.
The DC-PEM can be powered using a regular telecommunication power supply of
-48/-60 VDC with a VDC return. The specified voltage range is from -40.5 VDC to
-72 VDC. The Shelf supports redundant power inputs but the two inputs should be in-
dependently powered.
12713813
1
Green Fan Tray OK LED
4
Hot Swap push button
2
Red Fan Tray Alarm LED
5
IEC 320-C14 connector
3
Blue Hot Swap LED
6
Mains switch
7
Fuse
