User's Manual

RX Frame Error Rate (FER) Acceptance Test

SC 4812T CDMA BTS Optimization/ATP

May 2000

4-12

FER Test

This test verifies the BTS FER on all traffic channel elements currently

configured on all equipped MCCs (full rate at 1% FER) at an RF input

level of –122 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

are 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).

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 that

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, if selected, the MCC is re-configured to assign

the applicable redundant BBX to the current RX antenna paths under

test. The test is then repeated.