User Manual

6-67
Powering base stations
This section describes tips for powering base stations, as well as the component connection
sequence you need to use to properly power base stations.
Powering tips
• It is recommended that you use a redundant power supply for base stations.
• Each base station requires 48 volts DC at 3.0 amps maximum.
• The ground of the power can be either negative or positive. The 48 volt power input to the
base station is floating, so either the positive or negative can be grounded.
• Power input is polarity sensitive, so be sure you connect V+ and V- properly.
• Depending on the type of equipment you own, supply power to the Ethernet switch and
backbone network equipment.
• It is recommended that you use an uninterruptable power supply (UPS).
Tips for sizing the UPS include:
• Size the voltage and amperage of the power supply according to the number of base
stations at your cell site.
• Size the UPS according to the efficiency of the DC power supplies and power
requirements of the other ancillary equipment, such as the Ethernet switch and
backbone network equipment.
• Consider the time you want to allow the system to operate on the UPS.
Powering the base station
The base station does not have a power switch. Rather, it receives its power when the UPS,
power supply, and TVS module are connected to the base station through the Ethernet/
power cable.
To connect the base station to a power supply, connect these components in the order that
follows:
1 Connect the base station to the antenna.
2 Connect the GPS to a base station, and use a daisy chain wiring scheme to connect the
other base stations.
3 Connect the base station to the TVS module using the Ethernet/power cable of the
desired length.
4 Use an Ethernet cable to connect the TVS module to the network. Use a standard DC
power cable to connect the TVS module to the power supply.
5 Connect the power supply to the UPS.
6 Connect the UPS to an AC power supply.