User's Manual

Pre–Power–up Tests68P09258A31–A
Oct 2003
1X SCt 4812T BTS Optimization/ATP
2-5
Pre–Power–up Tests
Objective
This procedure checks for any electrical short circuits and verifies the
operation and tolerances of the cellsite and BTS power supply units prior
to applying power for the first time.
Test Equipment
The following test equipment is required to complete the pre–power–up
tests:
S Digital Multimeter (DMM)
CAUTION
Always wear a conductive, high impedance wrist strap while
handling the any circuit card/module to prevent damage by ESD.
Cabling Inspection
Using the site-specific documentation generated by Motorola Systems
Engineering, verify that the following cable systems are properly
connected:
S Receive RF cabling – up to 12 RX cables
S Transmit RF cabling – up to six TX cables
S GPS
S LFR
NOTE
For positive power applications (+27 V):
S The positive power cable is red.
S The negative power cable (ground) is black.
For negative power applications (–48 V):
S The negative power cable is red or blue.
S The positive power cable (ground) is black.
In all cases, the black power cable is at ground potential.
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