Using the GSM Analyzer and the EDGE Analyzer
Option 230 - GSM Analyzer enables measurements of GSM signals. Similarly, Option 235 - EDGE Analyzer enables measurements of EDGE signals.
This section explains how to make standard GSM measurements using Option 230 - GSM Analyzer. It also explains how to make the more advanced EDGE measurements for which you will require Option 235 - EDGE Analyzer.
GSM and EDGE transmitter measurements verify proper transmitter performance and can be made with the base station in service or out of service. Important metrics include:
- Frequency Error
- BSIC (Base Station Identification Code)
- TSC (Training Sequence Code)
- Modulation Type
- TS Pwr (Timeslot Power) in dBm
- TS Pwr in W
- Occupied Bandwidth
- I/Q Offset
- RMS Phase Error
- Peak Phase Error
- RMS EVM (Error Vector Magnitude)
- Peak EVM
- 95%tile EVM (95th Percentile EVM)
NOTE: RMS EVM, Peak EVM, and 95%tile EVM measurements are only available if Option 235 - EDGE Analyzer is installed
Three different graphical views of your measurements are available. You can view:
The measurements conform to the following GSM standards:
CAUTION: The maximum power for the RF In (Port 1) and RF Out/SWR (Port 2) ports is +20 dBm (100 mW). When using the 8481A/8482A Power Sensors, the maximum input power applied to the Power Sensor is +24 dBm (300 mW). When using the 8481D Power Sensor, the maximum input power is +20 dBm (100 mW). When directly coupled to a base station (BTS) or Access Network (AN), the test set can be damaged by excessive power applied to any of these three ports.
To prevent damage in most situations when you directly couple the test set to a base station, use the high power attenuator between the test set and the BTS.
NOTE: To prevent unusual display information from being shown, ensure that you have selected a valid GSM Standard. It is possible for you to set a Chan Std that allows you to enter a lower Stop channel number than the current Start channel number resulting in unexpected information in the display. This is because some of the channel standards have discontinuities and reversals in channel numbers.