How Do I Use the Data Throughput Monitor?

Accessing the Monitor Controls

1. Press the Instrument selection key.
2. Select Data Throughput Monitor .
   

   
   The data throughput monitor is displayed with the default settings as shown above. The Swap Window Positions ( F5 ) is displayed only when another measurement or instrument is active.

   Once the data throughput monitor is selected, it can be accessed by pressing the MEASUREMENT key, followed by the Swap Window Positions ( F5 ) key if necessary.

3. Set the axis control as needed for your testing situation using the Axis Control ( F1 ) key to access the Time Span ( F1 ), Start Data Rate ( F2 ) Stop Data Rate ( F3 ) keys. For example, if you expect data rates to exceed the default value of 100 kbps, press the ( F1 ) key followed by the ( F3 ) key and enter a new value in the Stop Data Rate field using the DATA ENTRY keys.
4. Press the Return ( F6 ) key to exit the Axis Control menu.
5. Select the traces you would like to display by pressing the Trace Control ( F2 ) key followed by the Trace Display ( F1 ) key. To select a trace, turn the value to On. There are four color-coded traces and any combination can be selected:
   • OTA Tx - (Over The Air Transmitted bits-per-second). This is the rate of link-layer bit transfer sent from the wireless device. In other words, OTA translates into RLP (Radio Link Protocol) in cdma2000 and 1xEV-DO, or RLC (Radio Link Control) protocol in WCDMA and GPRS, or PPP in GSM. Tx refers to the reverse or uplink channel direction.
   • OTA Rx - (Over The Air Received bits-per-second). This is the rate of link-layer bit transfer received by the wireless device. In other words, OTA translates into RLP (Radio Link Protocol) in cdma2000 and 1xEV-DO, or RLC (Radio Link Control) protocol in WCDMA and GPRS, or PPP in GSM. Rx refers to the forward or downlink channel direction.
   • IP Tx - Internet Protocol Transmitted. This is the rate of network-layer bit transfer sent by the wireless device. Tx refers to the reverse or uplink channel direction.
   • IP Rx - Internet Protocol Received. This is the rate of network-layer bit transfer received by the wireless device. Rx refers to the forward or downlink channel direction.

   By default, the OTA Tx and OTA Rx traces are the only traces turned on.

6. Press the Return ( F6 ) key to exit the Trace Control menu.

7. Establish a data connection with the mobile.

   The Data Throughput Monitor will begin displaying numerical and graphical information. The numerical information pertains to the period of time beginning with the establishment of the first data connection, and the graphical traces represent up to 600 seconds of the latest data throughput statistics.

8. Set a marker.

   Using the Trace Control menu, select a marker by pressing the corresponding F2 , F3 , F4 , or F5 keys followed by the Data Entry key labeled ON.

   Press the Return ( F6 ) key.

   After allowing the monitor to accumulate throughput for at least one minute, change the Time Span to 50 seconds (see step 3 above). This will expand the graphical view to improve resolution.

   Press the Return ( F6 ) key.

9. Freeze the graph.

   Press the Freeze Graph (F4) key.

   Turn the knob to adjust the position of the marker. Marker results will be displayed in the summary table

   
10. Press the Return ( F6 ) key to exit the Trace Control menu.
11. Press the Resume Graph ( F4 ) key to display the most recent trace data.
12. Press the Clear Graph ( F3 ) key to reset the traces and the numeric counters.

Changing Data Rates

Data throughput can be analyzed under various call processing and RF conditions. This section illustrates the steps required to change data rates.

It is assumed that the data throughput monitor is displayed and a data call is connected.

1. Press the CALL SETUP key.
2. Change the data rate (see Related Topics).
3. Press the MEASUREMENT key.