Service Manual

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6802800U74-AN
Chapter 4: Hardware Installation
4.8.6
GPS Interference Avoidance
You can employ the following two strategies to mitigate against jamming signals:
• Determine a location where adequate GPS signals are available using a hand held receiver and
move the Base station GPS antenna to this location.
• Construct a shield (Cardboard Foil is adequate) to exclude the jamming signal. Locate the shield
approximately 6 cm from the antenna body and connect it to an earth point.
4.9
X. 1, E1-120Ω Cabling
A cable connects the network termination unit (NTU) and the E1/X.21 interface on the MTS Junction
Panel, see Figure 74: E1/X.21 and Ethernet Site Link Connectors on the MTS LiTE Junction Panel on
page 132 for MTS LiTE, Figure 75: E1/X.21 and Ethernet Site Link Connectors on the MTS 2 Junction
Panel on page 133 for MTS 2 and Figure 76: E1/X.21 and Ethernet Site Link Connectors on the MTS 4
Junction Panel on page 133 for MTS 4.
The E1 or X.21 (only one of them can be used) connectors on the Junction Panel are connected with
the Site Controller through an internal extension cable. For more information, see E1 and Ethernet
Cabling on page 162 and User Alarms/Controls, X.21, RGPS, and GPS Cabling on page 155 in
Interconnection and Internal Cabling on page 149.
NOTICE: Figure 75: E1/X.21 and Ethernet Site Link Connectors on the MTS 2 Junction Panel
on page 133 and Figure 76: E1/X.21 and Ethernet Site Link Connectors on the MTS 4 Junction
Panel on page 133 depicts the newer version of the MTS Junction Panel. There may be small
differences in older configurations.
Figure 74: E1/X.21 and Ethernet Site Link Connectors on the MTS LiTE Junction Panel
X.21
E1
Ethernet
Site Links