Product Info

METRO CELL OUTDOOR (DE/RE) CDMA BTS RADIO DEVELOPMENT
PROPRIETARY CELL SITE REQUIREMENTS
Feb. 2001 - 24 - Issue 01 Stream 00
10.0 Grounding
10.1 BTS grounding Architecture
The FRM is grounded to its mounting structure, whether a tower, wall, building or pole. for
outdoor Metrocell or the radio rack (Indoor Metrocell). If the structure is non-conductive (e.g.
wooden pole) it shall be provided with a ground cable as part of the site ground.
The FRM mounting structure and BTS cabinets both connect to the site ground ring. #2 AWG
cables less than ten feet long are used for these primary, external ground connections.
10.2 Antenna Grounding
Each GPS antenna will be grounded at the antenna mast and again at the cable entry point (coax
cable shield) inside the DEI. Similarly, the cell site antenna(s) are grounded at the tower and may
be further protected by lightning rods on the mounting structure, protruding above the antennas,
preventing direct strike to the.
10.3 Radio rack Grounding
The common ground point in the RE is the subframe. A #2 AWG cable will connect the
subframe to the main ground point in the DEI in the side-by-side configuration. When the
RE is installed remotely from the DEI/DE the ground cable will connect the subframe to
the site ground in that area. Attachment shall be made with two hole compression lugs.
The shield of the DC power cable connecting the main electronics cabinet to the FRM
shall be grounded at both the FRM end and the main enclosure end (main ground plate)
.
Provision one NTGS0161 main site ground cable for the DEI/DE and one for every RE.
10.4 Site Ground Ring
A peripheral grounding ring, usually buried around the site perimeter, or routed along the outer
edge of the roof of a building, provides the main site ground. It provides an
equipotential reference to minimize differential voltages during lightning surges. It
consists of a #2 AWG (or larger) uninsulated, tinned copper conductor. Connections are
made to it using C-tap clamps.
The ground ring makes earth contact through ground electrodes, typically copper-clad
stakes 3m (10 ft.) long, driven into the ground at 2.5 to 3m (8-10 ft.) intervals around the