User Manual
Initial Power Up Tests & Procedures – continued
2-6 1X SC4812T–MC BTS Optimization/ATP 5/21/04
DRAFT
Common Power Supply
Verification
The procedure in Table 2-4 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.
While handling any circuit card/module, always wear a
conductive, high impedance wrist strap 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
Table 2-4: Common Power Supply Verification
Step Action
1 Physically verify that all DC power sources supplying the frame are OFF or disabled.
2 On each frame:
S Unseat all circuit boards (except CCD and CIO cards) in the C–CCP shelf and LPA shelves, but
leave them in their associated slots.
S Set breakers to the OFF position by pulling out C–CCP and LPA breakers (see Figure 2-3 for
breaker panel layout if required).
– C–CCP shelf breakers are labeled CCCP–1, 2, 3.
– LPA breakers are labeled 1A–1B through 4C–4D.
3 On –48 V BTS: Remove the –48 V to +27 V Power Supply Modules.
4 Inspect input cables, verify correct input power polarity via decal on top of frame.
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:
On –48 V BTS: –48 Vdc
nominal
On +27 V BTS: +27 Vdc nominal
7 On –48 V BTS: Plug in PSMs one at a time and verify ’Green’ LEDs on PSMs light.
Initial Power-up (BTS)
The procedure must be performed on each frame after input power from
the common power supply has been verified. Follow the steps in
Table 2-5 to apply initial power to the cards/modules within the frame
itself, verifying that each is operating within specification.
2