Installation Manual

August 23, 2006 Revision 00b-DRAFT 13
Chapter 2: Site Preparation
Electrical Requirements
Before you begin installing the base station, read the following requirements. Ensure that each
requirement is met before proceeding with the installation and consult your MOPs for procedures
concerning power, grounding, and high-risk cut-over activities.
Base Station Power Supply
Table 2.6 lists the required power specifications (MMDS) for the base station.
NOTE: Each radio module draws up to 9A at –48V, depending on the supported RF
spectrum.
NOTE: A readily accessible disconnect device shall be incorporated in the building
installation wiring.
Base Station Power Supply Circuit Breakers
The customer’s –48V DC power supply must be equipped with a TBDA circuit breaker to protect the
base station power cables.
Base Station Power Supply Grounding
The return lead on the power supply shall be connected to earth ground. For fault protection, the
earthing conductor shall be sized in accordance with applicable regulations to carry the current of the
largest power source circuit breaker. Since this is a negative-supply positive-ground system, the return
lead is the one with the most positive potential of the active conductors, –48V and DC return.
Backup Power
The base station does not contain any internal battery backup systems. Ensure that your main power
source has a backup power system in case of a power failure.
WARNING: Failure to meet the following requirements may result in personal injury
and cause damage to or destruction of the base station and surrounding equipment.
Specification Value
Nominal power supply –48V DC
Voltage range –38V to –70V DC
Maximum ripple/noise 100 mVp-p from DC to 20 MHz
Recommended DC power setting –54.4V (measured at the PDP inputs)
Current at –48V (1 sector) 22.2A
Power consumption at –48V (1 sector) 1064W
Table 2.6 Base Station Electrical Requirements