User's Manual Part 1

March 29, 2006 Part ######A revision 00a-DRAFT 23
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.
+24V Base Stations
Figure 2.2 shows the power and ground cables for the base station.
Figure 2.2 Base Station Power and Ground Cabling
Main Power
The base station requires a +24V (nominal) DC power supply. The recommended DC power source
setting is +27.0V (as measured at the PDP inputs).
The minimum recommended DC input voltage at the PDP is 25.0V; the maximum recommended
DC input voltage at the PDP is 28.0V. 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 base station 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.
NOTE: A readily accessible disconnect device shall be incorporated in the building
installation wiring.
!
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.
PDP
Base Station Rack Power Supply
Return 1 (–) Return 2 (–) Return 3 (–)
+24V Feed 3 +24V Feed 2 +24V Feed 1 Ground (PDP) Ground (Frame)
Frame
+24V Bus
Return (–) Bus
Ground Bus
Earth Ground
Circuit Breakers