User Manual

RX Frame Error Rate (FER) Acceptance Test
July 1999
4-21
SC 4812ET BTS Optimization/ATP – CDMA LMF
PRELIMINARY 2
Background: FER Test
This test verifies the BTS Frame Error Rate (FER) on all traffic channel
elements currently configured on all equipped MCCs (full rate at 1%
FER) at an RF input level of –119 dBm [or –116 dBm if using Tower
Top Amplifier (TMPC)]. All tests are performed using the external
calibrated test set as the signal source controlled by the same command.
All measurements will be via the LMF.
The pilot gain is set to 262 for each TX antenna and all channel elements
from the MCCs are forward-link disabled. The BBX2 is keyed up using
only bbxlvl level offsets, to generate a CDMA carrier (with pilot channel
element only). BBX2 power output is set to –20 dBm as measured at the
TX OUT connector (on either the BTS or RFDS directional coupler).
The BBX2 must be keyed in order to enable the RX receive circuitry.
The LMF prompts the MCC/CE under test to measure all zero longcode
and provide the FER report on the selected active MCC on the reverse
link for both the main and diversity RX antenna paths, verifying the
results meet the following specification: FER returned less than 1% and
total frames measured is 1500.
All MCC/CEs selected are tested on the specified RX antenna path. The
BBX then de-keys and, the applicable redundant BBX2 is assigned to
the current RX antenna paths under test. The test is then repeated.
FER test
The CDMA LMF Tests menu list item, FER, performs the Frame Error
Rate (FER) test for a XCVR(s). All measurements are made through the
appropriate RX output connector using the calibrated RX 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
 BBXs 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 and GPIB is on
 LMF is logged into the BTS
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