User Manual

TX Waveform Quality (rho) Acceptance Test
PRELIMINARY 2
SC 4812ET BTS Optimization/ATP – CDMA LMF
July 1999
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Background: Rho Test
This test verifies the transmitted Pilot channel element digital waveform
quality of each BBX2 carrier keyed up at a specific frequency per the
current CDF file assignment. All tests are performed using the external
calibrated test set controlled by the same command. All measurements
are via the appropriate TX OUT (BTS/RFDS) connector.
The Pilot Gain is set to 262 for each antenna, and all channel elements
from the MCCs will be forward link disabled. The BBX2 is keyed up
using both bbxlvl and bay level offsets, to generate a CDMA carrier
(with pilot channel element only, Walsh code 0). BBX2 power output is
set to 40 dBm as measured at the TX OUT connector (on either the BTS
or RFDS directional coupler).
The calibrated communications test set measures and returns the Pilot
channel element digital waveform quality (rho) in dB, verifying that
result meets system tolerances Waveform quality (rho) should be >
0.912
(–0.4 dB).
The BBX2 then de-keys and the applicable redundant BBX2 is assigned
to the current TX antenna path under test. The test is then repeated.
The LMF Tests menu list item, Rho, performs the waveform quality test
for a XCVR(s). All measurements are made through the appropriate TX
output connector using the calibrated TX cable setup.
This test is included in the All TX, All TX/RX and Full Optimization
tests.
Prerequisites
Before attempting to run any ATP tests, ensure the following have been
completed:
 CSMs, GLI2s, BBX2s, and MCCs have correct code load and data
load
 Primary CSM, GLI2, and MCCs are INS
 BTS has been Optimized/Calibrated per Chapters 2 and 3
 BBX2s are OOS–RAM
 Test equipment is connected for ATP tests (see Figure 3-16 through
Figure 3-19).
 Test equipment is warmed up 60 minutes and calibrated
 Test cables are calibrated
 GPIB is on
 LMF is logged into the BTS
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