User Manual

Initial Power Up Tests & Procedures

5/21/04 1X SC4812T–MC BTS Optimization/ATP 2-5

DRAFT

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.

NOTE

For positive power applications (+27 V):

S The positive power cable is red.

S The negative power cable 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.

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 2-3.

Table 2-3: DC Input Power Cable Guidelines

Maximum Cable Length Wire Size

30.38 m (100 ft) 107 mm

(AWG #4/0)

54.864 m (180 ft) 185 mm

(350 kcmil)

Greater that 54.864 m (180 ft) Not recommended

Make sure the connector adapters are securely attached to

each of the BTS power feeds and returns. Also, make sure

the cables have been properly installed into each

connector.

NOTE