User's Manual Part 2

Initial Power–up Tests

DRAFT

SCt4812T CDMA BTS Optimization/ATP

Mar 2001

2-12

Power-up Procedures

Potentially lethal voltage and current levels are routed to

the BTS equipment. This test must be performed with a

second person present, acting in a safety role. Remove all

rings, jewelry, and wrist watches prior to beginning this

test.

WARNING

DC Input Power

In the tests to follow, power will first be verified at the input to each

BTS frame. After power is verified, cards and modules within the frame

itself will be powered up and verified one at a time.

Before applying any power, verify the correct power feed and return

cables are connected between the power supply breakers and the power

connectors at the top of each BTS frame. Verify correct cable position

referring to Figure 2-3 on page 2-7 for +27 V systems and Figure 2-5 on

page 2-9 for –48 V systems.

Always wear a conductive, high impedance wrist strap

while handling any circuit card/module to prevent damage

by ESD. Extreme care should be taken during the removal

and installation of any card/module. After removal, the

card/module should be placed on a conductive surface or

back into the anti–static bag in which it was shipped.

CAUTION

For positive power applications (+27 V):

 The positive power cable is red.

 The negative power cable (ground) is black.

For negative power applications (–48 V):

 The negative power cable is red or blue.

 The positive power cable (ground) is black.

In all cases, the black power cable is at ground potential.

IMPORTANT

Motorola recommends that the DC input power cable used to connect the

frame to the main DC power source conforms to the guidelines outlined

in Table 2-4.

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