Assembly Instructions

Ripwave Base Station I&C Guide Navini Networks, Inc.
252 Part #40-00047-00 Rev F v1.0 (TTA)
October 23, 2003
Equipment Settings
Part of the Test Procedures below.
Test Procedure Setup
Set up the test procedures, per the following.
Step 1. Calibrate the BTS and perform the Calibration Verification procedure.
Connect the Modem and the attenuators. The combined attenuation should be set roughly as
follows:
Total attenuation = PTX - 30 + 18 – Cal cable loss + 80
Where PTX is the Tx output power at antenna input port that is set in EMS during
calibration. Cal cable loss is the loss of the calibration cable.
The total attenuation should be partitioned between fixed and adjustable attenuators in
such a way that the adjustable attenuator is set to about 10 dB.
Disconnect the calibration cable from the back of the BTS shelf and connect it to the attenuator
as shown in the drawing
Ping the BTS continuously from the Modem.
Check the sync level at the CPE debug tool. The level should be about –80 dBm.
Test Procedure - Check Modem Sensitivity & Output Power
Follow the steps in the procedure below.
Step 1. Record the downlink TCC power level and SNR reading on the CPE debug tool.
Step 2. Calculate the effective noise floor: NF= SNR
TCC
– Level
TCC
.
Where SNR
TCC
is the TCC SNR and Level
TCC
is the received downlink TCC level.
NF should be close to –127 ±5.
Step 3. Check Modem output power cap difference. It should be greater than 0.
Step 4. Increase the attenuation by 10 dB (increase the attenuation of the adjustable
attenuator).
Step 5. Measure the effective noise floor and the output power cap difference gain.
Step 6. Increase the attenuation by another 10 dB and take the measurements again (if the link
is broken when the attenuation increases 10 dB, back off the attenuation by 10 dB and
then increase the attenuation with 1 dB steps until the link is broken. Then reduce the
attenuation by 4 dB).