Technical data

104 Chapter 3
1xEV-DO Analyzer and Over Air Test
Metrics Provided by the 1xEV-DO Tx and Over Air Analyzer
Measurement
1xEV-DO Analyzer and Over Air
Test
Metrics Provided by the 1xEV-DO Tx and Over Air
Analyzer Measurement
This section contains descriptions of the individual 1xEV-DO parameters in the
metric display of the screen. For information on expected result values and possible
causes of error if the expected results are not met, see “Interpreting the Display” on
page 75.
You can switch the display of the metric results Off by pressing [Display], and then
setting [CDP and Metrics] to Off. Only the Freq, the PN Offset, and the Time Offset
metrics will be displayed. All other metrics will appear as dashes.
If the OTA PN Scanner is turned On, and either the measured Pilot Dominance is
not within its limits, or the measured Multipath Power is not within its limits, all
metrics will be displayed in gray text. This indicates that because either one, or both,
of Pilot Dominance and Multipath Power have not met their specified limits, all the
results being displayed are inaccurate to an unknown degree, and may therefore be
unreliable. Ensure that your signal meets the Pilot Dominance Limit and the
Multipath Power Limit to ensure you collect accurate results.
Frequency
Frequency is the center frequency you entered.
Frequency Error
Frequency error is the frequency difference between your access network’s actual
center frequency and the frequency (or channel) you entered. With a valid time
reference (GPS or ESC) this will have a range of
± 25KHz about the selected center
frequency. For a pure frequency reference it is limited to
± 500Hz.
PN Offset
The PN Offset is a “short code” sequence that provides a unique identifier for each
sector of each cell site. The PN Offsets are applied to the I and Q signals before
modulation. PN Offsets are offset in time by 52.08 µs and they repeat every 26.666
ms. This yields 512 unique short code sequences (0-511). The access terminal needs
the PN Offset to decode information in the Pilot channel and the MAC channel, both
of which are transmitted by the access network.
Time Offset