User Manual

December 16, 2002 Part 003609A revision 01 27
Chapter 2: Site Preparation
Electrical Requirements
Before you begin installing the NPM, 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.
Main Power
The NPM requires a +24V DC power supply. See your E1 package for the
recommended settings of your power supply.
The minimum DC input voltage at the PDP is 22.6V; the maximum DC input
voltage at the PDP is 29.2V. The input power noise level should not exceed a
maximum of 100 mV peak-to-peak, DC to 20 MHz.
NOTE: The minimum gauge for the wires connecting the NPM
to the main power source is #2 AWG. The maximum loop length
of #2 AWG wire is 19.8 m (65 feet). #2 AWG wire that is less than
this length will not be damaged or overheat in the event of a
current overload or short-circuit condition.
Table 2.8 shows the power consumption for the different configurations of the
WCS NPM when receiving +27V DC at the PDP.
NOTE: Each RFSS module draws 17A at +27V DC.
!
WARNING: Failure to meet the following requirements may result in
personal injury and cause damage to or destruction of the NPM basestation
and surrounding equipment.
Configuration Radio Rack (A) RF Rack (A) Total (A) Total (W)
6 sectors 79.8 212.4 292.2 7305
3 sectors 46.8 110.4 157.2 3930
1 sectors 28.2 42.4 70.6 1765
Table 2.8 Power Consumption Values