Preparing to Make 1xEVDO Tx Analyzer Measurements

Common 1xEVDO Tx Analyzer Measurements

Preparing to Make 1xEVDO Tx Analyzer Measurements
When measuring 1xEVDO transmitter performance, there is no need to take the access network out of service. The Access Network only needs to be taken out of service when you are setting or measuring the Tx Power Out level, and this is typically only performed during Preventative Maintenance.
The first step is to choose the type of time reference available. The measurement configuration depends upon the type of time reference you choose to use. Optimally, a GPS time reference is desired. GPS provides an independent time reference that can help determine if the access network under test is synchronized with the rest of the network. Access networks not synchronized with the rest of the network are referred to as "island cells".

NOTE: If a GPS time reference is available, you will be able to see all the metrics, and you will be able to verify that the access network has correctly locked onto the GPS signal.

NOTE: If you connect to the access network's Even Second Clock, you will still get all the metrics, but you will not have an independent check that the access network has locked onto the GPS signal.

NOTE: You need a timing reference (either GPS or ESC) to see PN Offset and Time Offset results. When using another non-time based reference (for example, Internal Reference), results for PN Offset or for Time Offset will be unavailable.

You must also know the channel or frequency of the 1xEVDO signal to be analyzed.
Each access network sector is assigned a unique PN [pseudo-noise] Offset. If you are using a GPS signal or the Even Second Clock, the PN Offset will be detected for you. If you are making measurements without the aid of either a GPS signal or the Even Second Clock, you will need to know the PN Offset of the Access Network that is producing the signal to be analyzed. For more information on PN Offsets refer to "Adding a Marker"