BRX Power Injector Installation Guide
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180-0192-001-R01
compatibility.
The BRX Power Injector delivers a -48Vdc (0.5w) sealing current for each pair where a BRX
amplification device is installed. Looking at figure 2, there are three (3) 8-pair power modules
installed. The output of these power modules connects to the pairs from the POTS port of the DSLAM
via a standard 110 punch down block (top left section of the picture. It is possible to connect two (2)
24-pair cables from the DSLAM. The opening allow for up to two cables for a total of 24 pairs
powered from the BRX Power Injector and the remaining pairs passed through untouched.
The BRX Power Injector typically connects to the DSLAM POTS port(s) via a nearby cross-connect
box. Its flexible design also supports a direct connection to the DSLAM. It is also possible to use the
BRX Power Injector as a basic cross-connect when having to combine POTS and BRX Power pairs
on the same cable binder(s) and in the absence of a cross-connect.
2.1 Connecting the BRX Power Injector to the DSLAM via a cross-connect
When connecting the BRX Power Injector via an existing cross-connect, a single 24-pair cable
connects to the BRX Power Injector since the cross-connect will then connect to the pairs that need
the -48Vdc sealing current into the DSLAM.
Figure 3: Connecting the BRX Power Injector to the DSLAM via a cross-connect
2.2 Connecting the BRX Power Injector Directly to the DSLAM
It is possible to connect the BRX Power Injector directly to the DSLAM where there is no cross-
connect at the location. In this case, it is important to assign the power to those pairs where a BRX
device is present. You will also need to make sure you select the proper cable binder matching each
amplified DSL pairs.
