User's Manual

Navini Networks, Inc. Ripwave Base Station I&C Guide
45
Ground Requirements for the Base Station
The Base Station requires an earth ground connection. Grounding from copper point to copper
point shall be less than 1 ohm. Grounding from copper point to earth ground shall be less than 5
ohms. All power and ground conductors must be mechanically supported to avoid strain of the
wires and connection points. Refer to the Regulatory Information in Chapter 1, Page 8.
NOTE: The installation procedures, which begin next, follow the same order as shown in
the High-level I&C Process Flowchart in Figure 4.
Install Power & Grounding
Check all regulatory standards (refer to Chapter 1, Page 8 “Regulatory Information”) prior to
installation.
System Ground Buss Bar & Surge Protectors
The Base Station system ground buss bar and data/power cable surge protectors are mounted on
the wall adjacent to the BTS rack or enclosure. They should be mounted per accepted telecom
standards and procedures.
Step 1. Mount the data/power cable surge protectors (Figure 10) with the label ‘lines’ toward
the RFS and the label ‘BTS’ toward the BTS.
Step 2. Apply a thin coat of anti-oxidant joint compound to both sides of the system ground
buss bar to ensure proper connection between it and the surge protectors.
To install the eight (8) antenna and one (1) cal cable surge protectors (Figure 11), and the one (1)
or two (2) Global Positioning System (GPS) surge protectors (Figure 11) in the system ground
buss bar, follow the steps below.
1. Install the rubber gasket into the groove in the surge protector.
2. Install the surge protector in the system ground buss bar with the surge side toward the
antenna and the protected side toward the BTS.
3. Install the star washer and nut on the top of the surge protector. Torque the nut to 140-150
inch-pounds.
4. When finished, the mounted surge protectors in the buss bar will appear as in Figure 12.
CAUTION! Navini Networks provides both Secondary (built-in) and Primary
(optional) Lightning Protection. Lightning Protection helps to protect the RFS, the
BTS, and the RF lines against “tower lightning” events occurring at the Base Station.
The customer must exercise judgment when balancing risk against cost to decide