User's Manual Part 1

24 Part ######A revision 00a-DRAFT March 29, 2006

Macro Base Station Installation Procedures (NPM-1000)

Table 2.9 shows the maximum power consumption for the different configurations of the base

station..

Main Power Bay Circuit Breaker Size

Each rack requires three +24V DC feeds. Table 2.11 shows the recommended values of the circuit

breakers to protect each feed.

Main Power Source Grounding

The return lead (sometimes labeled as negative, "–") on the base station’s power supply shall be

connected to earth ground as close as possible to the +24V DC source (i.e. the rectifier or DC-DC

converter). For fault protection, the earthing conductor shall be sized in accordance with applicable

regulations to carry the full rated current of the 24V DC source. Since this is a positive-supply

negative-ground system, the return lead is the one with the most negative potential of the active

conductors, +24V and DC return.

Power Bay Ground and Voltage Levels

Table 2.12 shows the required electrical levels as measured at the PDP terminals.

Version Configuration Radio Rack (A) RF Rack (A) Total (A) Total (W)

MMDS 6 sectors 80 212 292 7305

3 sectors 47 110 157 3930

1 sectors 28 42 71 1765

PCS 6 sectors 80 152 232 5805

3 sectors 49 80 129 3230

1 sectors 28 32 61 1515

WCS 6 sectors 80 212 292 7305

3 sectors 47 110 157 3930

1 sectors 28 42 71 1765

Table 2.10

Power Consumption Values (+24V)

Rack WCS MMDS PCS

Radio 70A 70A 70A

RF 100A 100A 70A

Table 2.11

Power Bay Circuit Breaker Sizes (+24V)

Unit Measurement Specification

Voltage +24V DC (+) to return (–) +27.0V DC nominal (25.0V DC min, 28.0V DC max)

Power +24V DC (+) to return (–) 10kW minimum

Voltage Return (–) to ground 0.5V DC maximum

Resistance Return (–) to ground 0.1Ω maximum

Voltage +24V DC (+) to ground +25.0V to +28.5V DC

Table 2.12

Required Ground Levels (+24V)