User Manual

6-66 Configuring, Installing, and Using Carrier Infrastructure
The GPS does not ship with mounting accessories. You can obtain these accessories from
many suppliers around the world, especially distributors of marine products.
Follow these tips when mounting the GPS:
• Mount the GPS unit on a threaded pipe or pole.
• The GPS mounting socket accepts a 1.0000 x 14 straight thread. It is recommended that
the pole/pipe you use be 1.000 inch.
• Secure the pipe or pole to the building or other support structure.
• Ensure at least half of the sky is clearly visible to the unit.
• Expose the unit to the southern portion of the sky. GPS satellites move generally from the
southwest to the northeast.
Connecting the GPS unit to the base station
One GPS unit can support numerous base stations in the same cell.
Use the GPS-to-base station cable to attach the GPS unit to one of the base stations in the
cell.
To connect the cable to the GPS unit and to the base station (both of which have already
been installed and mounted):
1 Connect the cable’s molded, circular female connector to the GPS unit.
2 After connecting the cable to the GPS unit, run the cable to the base station. Plug the
cable’s other end into the base station’s GPS connector.
3 Secure the cable that you just ran to an appropriate support structure. Coil and tie any
excess cable.
4 The GPS unit receives its power from the base station. The base station supplies power to
the GPS device, which uses 18 volts DC at 150 milliamperes.
5 So that the remaining base stations in the cell can receive a GPS signal, connect a base
station adjacent to the base station you just connected to the GPS unit.
Continue to use the daisy chain wiring scheme to connect the remaining base stations, until
all of the base stations within the cell are connected to each other.
On the last base station in the daisy chain, connect the load termination on the open GPS
connection.
Connecting to the backbone network
The base station connects to a TVS module. You then connect the TVS module to your
network. Typically, base stations connect to a level 2 switch at the cell site, using a 10BaseT
connection. The switch controls the base station data traffic to and from the backbone
network.
Connect the switch to the backhaul network using the appropriate cabling.