6802800U74-AN
Chapter 4: Hardware Installation
CAUTION: For lightning strikes and surge protection, ground the screens of the shielded cables
and the coax cables and the Ground Box itself and Ground Box Junction in accordance with the
Motorola Standards and Guidelines for Communications Sites, R56 guidelines and national
standards, at the entrance of the building.
NOTICE:
Proper surge protection should be installed on Ethernet/E1/X.21 site links, all antennas, and
power inputs to prevent potential damage to the MTS. For more information, see Surge
Arrestors and Suppliers on page 456.
For full instructions and guidelines, always see Motorola Standards and Guidelines for
Communications Sites, R56.
4.5.1
Grounding Connection
Various cabling from the equipment cabinet to external equipment is made through the MTS Junction
Panel located at the top-rear of the equipment cabinet. The Junction Panel is accessed from the top of
the cabinet.
NOTICE: Depending on system configuration, not all connector locations on Junction Panel are
populated.
Cabinet grounding wires may have been installed prior to the cabinet installation. If so, follow the
instructions below.
If grounding wires have not yet been installed, refer to Grounding Requirements on page 85 in Site
Preparation on page 62.
Single-point ground method (where each cabinet is grounded to master ground using its own ground
wire) shall be used. The cabinet shall use green (or green-yellow) insulated wire with a minimum size
of 16 mm
2
CSA (#5 AWG) for ground wire.
The MTS is connected to the site ground through the M10 station ground point located on the junction
panel.
For MTS LiTE, see Figure 25: Station Ground Point on the MTS LiTE Junction Panel on page 98.
For MTS 2, see Figure 26: Station Ground Point on the MTS 2 Junction Panel on page 98.
For MTS 4, see Figure 27: Station Ground Point on the MTS 4 Junction Panel on page 98.
This connection is essential for the protection of the equipment against lightning induced surges.
If the specified wire size is not available, use the next-larger available wire size. During the installation
of cabinet ground wires, ensure to check any factory-installed internal ground connections for
tightness.
NOTICE: Figure 26: Station Ground Point on the MTS 2 Junction Panel on page 98 and
Figure 27: Station Ground Point on the MTS 4 Junction Panel on page 98 depict the newer
version of the MTS Junction Panel. There may be small differences in older configurations.
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