User's Manual

Initial Power–up Tests – continued

May 2000

2-13

SC 4812T CDMA BTS Optimization/ATP

Table 2-4: 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

If Anderson SB350 style power connectors are used, 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.

IMPORTANT

Common Power Supply

Verification

The procedure in Table 2-5 must be performed on any BTS frame

connected to a common power supply at the site after the common power

supply has been installed and verified per the power supply OEM

suggested procedures.

Perform the following steps to verify the power input is within

specification before powering up the individual cards/modules with the

frames themselves.

Table 2-5: Common Power Supply Verification

Step Action

1 Physically verify that all DC power sources supplying the frame are OFF or disabled.

2 On the RFDS (for +27 V systems only), set the input power switch P1 to the OFF position (see

Figure 2-7).

3 On each frame:

 Unseat all circuit boards (except CCD and CIO cards) in the C–CCP shelf and Linear Power

Amplifier (LPA) shelves, but leave them in their associated slots.

 Set breakers to the OFF position by pulling out C–CCP and LPA breakers (see Figure 2-3 on

page 2-7 or Figure 2-5 on page 2-9 for breaker panel layout if required).

– C–CCP shelf breakers are labeled CCCP–1, 2, 3 in the +27 V BTS and labeled POWER

1,4,5,2,6,7,3,8,9 in the –48 V BTS.

– LPA breakers are labeled 1A–1B through 4C–4D.

4 Inspect input cables, verify correct input power polarity via decal on top of frame (+27 Vdc or

–48 Vdc).

5 Apply power to BTS frames, one at a time, by setting the appropriate breaker in the power supply that

supplies the frame to the ON position.

6 After power is applied to each frame, use a digital voltmeter to verify power supply output voltages at

the top of each BTS frame are within specifications: +27.0 Vdc or –48 Vdc

nominal.