Ceragon Evolution IP-20LH - Power Distribution Card (PDC)

Evolution® IP-20LH Installation Guide
Ceragon Proprietary and Confidential Page 25 of 101
2.7 Power Distribution Card (PDC)
Evolution IP-20LH receives an external supply of 48V current via one or two
Power Distribution Cards (PDCs). The PDC or PDCs distribute the power via
the backplane to all the modules in the chassis. Each module receives the 48V
input and regulates it down to the operating voltage required by that module.
XCVRs are powered from the PDC, via the RMC that is connected to the XCVR.
The PDC monitors the power supply for under-voltage. The PDC includes a
LED labeled ACT, which displays Green during normal operation. If the voltage
goes below -38V, the LED displays Red. When the voltage returns to -40V or
higher, the Red indication goes off and the Green indication reappears.
The PDC includes reverse polarity protection, so that if the positive (+) and
negative (-) inputs are mixed up, the system remains shutdown.
The PDC can tolerate up-to -60V, with a maximum current of 30A.
A 1RU IP-20LH includes a single power distribution card (PDC) with a dual-
feed option for power redundancy. With the dual-feed option, users can
connect two power supplies to the PDC for power redundancy.
A 2RU IP-20LH can use two PDC cards for redundancy. Each PDC provides 48V
power to all modules in the chassis via the backplane, on different lines. A
diode bridge in the modules prevents power spikes and unstable power from
the two power sources.
Standard PDC Detailed View