Functional description
148 MPR-e
Power injector
General
The MPT-HC V2/MPT- MC is powered through an electrical Ethernet cable from the Power
Injector.
The Power Injector is an indoor device designed to deliver the DC power supply to the
MPT-HC V2/MPT-MC by using the cable that carries the Ethernet traffic.
At the input, the Power Injector receives the Ethernet traffic and the power supply on two
dedicated connectors. The Power Injector outputs, the power supply and Ethernet traffic on
one connector. This solution, called PFoE (Power Feed over Ethernet), is proprietary.
The Power Injector can power up to 2 MPR-e units.
The two power supply sources provide power supply redundancy.
Main functions of the Power Injector
• Securization of two DC power inputs from -48 VDC office power
• Low pass filtering
• Insertion of the DC voltage on two Ethernet streams to power two MPR-e units
• Surge protection on both Ethernet output ports (K44 & K45)
Power Injector versions
Two versions are available:
• Power Injector card: installed in the 7705 SAR shelf and powered through the
backplane.
Figure 47: Power Injector card
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