JDS Uniphase CellAdvisor JD780A Series, User Manual

Page: 386 / 592

JD780A Series Analyzers
386
Using EV-DO Signal Analyzer
Conducting power vs. time measurements
The Power vs. Time (Idle Slot and Active Slot) in EV-DO Signal Analyzer verifies that the transmitter
output power has correct amplitude, shape, and timing for the EV-DO format.
 Idle Slot: Slot with no data in traffic channel.
 Active Slot: Slot with the loaded data in traffic channel.
Forward link of 1xEV-DO is a frame structure and each frame consists of 16 slots. The frame period for
1xEV-DO is 26.667 ms, which is also the period of one pilot channel. Each frame is divided into 16
slots of 1.666 ms. 1xEV-DO uses CDMA modulation scheme, but unlike its previous systems the Pilot,
MAC (Media Access Control), and Data (Traffic) Channel are not transmitted simultaneously; instead
they are transmitted in TDM (Time Division Multiplex).
Power vs. time (idle slot)
The Power vs. Time (Idle Slot) measurement provides the idle slot that includes the Pilot and MAC
channels with the masks in all regions.
After configuring test parameters as described in the
“Configuring test parameters” on page 373, your
measurement result is displayed on the screen as like the following example, Figure 187.
Figure 187 Power vs. time (idle slot) measurement with EV-DO signal analyzer
NOTE
You can use the LIMIT hot key to analyze your measurements with the user-definable
limit and Pass/Fail indication. See
“Setting limit for power vs. time tests” on page 387 for
more information.
Power vs. time (active slot)
The Power vs. Time (Active Slot) measurement includes the Pilot, MAC, and Data channels with the
upper and lower masks.
After configuring test parameters as described in the
“Configuring test parameters” on page 373, your