Initial Power–up Tests and Procedures
68P64115A21–B
Sept 2003
1X SC 4812T-MC Multicarrier BTS Optimization/ATP
2-10
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.
CAUTION
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.
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.
2
