User's Manual

26/346 Issue 01 - April 2001 - Draft 04 3CC12426AAAA TQ BJA 01
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Figure 4 – Bias-T
Table 3: Bias-T connectors
2.3.6 – Surge protectors
Surge protectors protect the system power supply from damaging power surges that may occur during
a lightning strike to the outdoor equipment or IF cables. Surge protectors connect directly to each Bias-
T via a BNC connector, and contain a gas discharge tube that must be replaced regularly. Figure 5
shows a surge protector. Table 4 lists the connectors.
Figure 5 – Surge protector
Connector Type Purpose
DC OUT N(F)
Connects to the X-Pol RBS Tx or X-Pol RBS Rx to provide both –48 V
and RF signal connection
DC IN BNC(F)
Connects to the Bias-T power cable via an intermediate surge protector
to provide a –48 V power input
RF IN N(M)
Connects to the Primary radio or Redundant radio connector on the 12:2
Combiner/Splitter
DC OUT
DC IN
RF IN
To Bi a s- T
Ground screw
To Bias-T
power cable