3 Installation
ID No: 161692
PRELIMINARY
Page 23
3.2.4 Connection of the Antenna Cables
The Node C’s antenna connectors are 7/16 female (N female is an option). All
connectors are located at the bottom of the cabinet. An operator should refer to the
cable connectors manufacturer’s documentation for best mating procedures.
Furthermore, the bending radius of the antenna cables should be maintained at all
times.
There are several issues to be considered when selecting the cable and antenna
types.
•
Smaller diameter cables are less expensive and easier to install but have
worse performance.
•
Highly directional antennas with good front-back-ratios (40 dB is typical) are
recommended because they improve isolation and cell site selectivity.
Tighten the 7/16 (or N) connectors ONLY by hand. The use of pliers may
cause damage to the connector and impair the performance of the Node C.
figure 3-12 Front view of antenna connections
3.2.5 Connection
of Cable Bridge
The Interface Unit and the Node C are connected via a cable bridge. The bridge
ports 12V, 28V, ground, USB, and RS232 between the two units as well as the
general alarming and signalling. It is also the interconnection and intercommunication
bus between the units.
Coverage antenna (to mobile)
Donor antenna (to
base station)
Primary
Diversity
