Chapter 18
EVDO Mode
Introduction
This chapter presents information and procedures to make CDMA2000 EVDO measure-
ments. Option 34, EVDO Over The Air (OTA) requires Option 31 (GPS) and Option 63
(EVDO Demodulator).
CDMA EVDO has a chip rate of 1.2288MHz, the same as cdmaOne and CDMA2000
1xRTT. Each chip lasts for a duration of 0.8138 microseconds. In downlink, an EVDO sig-
nal can be time-divided into "half slots." Each half slot has 1024 chips.
The 1024 chips in a half slot can be further time-divided into three different channels: Pilot,
MAC and Data. The Pilot Channel provides synchronization for the EVDO Access Termi-
nals (for example, cell phones, laptops, etc.). The MAC (Medium Access Control) Channel
controls the overall EVDO traffic. The Data Channel transmits data to various users.
The Pilot and MAC Channels are always active in an EVDO signal, but the Data Channel
may sometimes transmit no data. When no data is transmitted, the half slot is considered
idle. Otherwise, it is called an active slot.
Cell Master Setup
The Cell Master can measure EVDO performance over the air with an antenna, or by con-
necting the base station directly to the Cell Master.
To measure an EVDO signal over the air, connect the appropriate frequency band antenna
to the Cell Master
RF In
connector, and an Anritsu GPS antenna to the Cell Master
GPS
connector.
To connect the base station to the Cell Master, connect the power amplifier of the base sta-
tion to the
RF In
connector of the Cell Master using a coupler or attenuator.
CAUTION: The maximum input power without damage is +43 dBm on the RF
In port, and +23 dBm on the RF Out port. To prevent damage, always use a
coupler or high power attenuator.
External Reference Frequency
In order to get good frequency accuracy measurements, it is important to use an external
reference frequency attached to the Cell Master
Ext Ref Freq
input. Most base stations have
a reference frequency available on a BNC connector. The Cell Master is able to lock to dif-
ferent frequencies. To configure the Cell Master to use an external reference frequency:
Step 1.
On the Cell Master, press the
MODE
key, use the Up/Down arrow key to select
the
EVDO
mode and press
ENTER
.
Step 2.
Press the
FREQ/DIST
key.
18-1
Summary of Contents for Cell Master MT8212B
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Page 222: ...12 4 Chapter 12 GPS Feature Figure 12 3 Saved GPS Location Information...
Page 231: ...Chapter 13 CDMA Measurement 13 9 Figure 13 5 CDMA Display with Markers...
Page 255: ...Chapter 18 EVDO Mode 18 5...