BRX Power Injector Installation Guide
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180-0192-001-R01
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Introduction
The Positron Broadband Reach eXtender (BRX) devices get their power from the -48Vdc sealing
current usually found on DSL + POTS pairs. Due in part to the migration away from POTS to VoIP or
data-only services
(sometimes referred to as “naked DSL”), DSL pairs may lack a -48Vdc sealing
current. The increased use of bonded xDSL pairs means that the second (2
nd
) pair is often without
sealing current. Positron designed the BRX Power Injector to inject the -48Vdc sealing current to
power the BRX devices installed on xDSL pairs requiring amplification.
The BRX Power Injector installs adjacent to the DSLAM where its power pairs connect to the POTS
port of the DSLAM where the CO telephone pairs normally terminate. The DSLAM then acts as a
combiner to overlay the -48Vdc sealing current onto the DSL pair. The BRX Power Injector is
available in 8, 16 or 24 pair configurations packaged in a UL-rated IP65 enclosure as per Figure 1.
Figure 1: BRX Power Injector – high-level view
The approximate dimensions of the BRX Power Injector are: 16.35” High x 13.0“ Wide x 3.85” Deep or
415 mm H x 333 mm W x 98 mm D. The enclosure includes flanges to easily mount the BRX Power
Injector on a pole, stake or on the back of popular pedestals.
