Anrtisu Cell Master MT8212B, User Manual, Page: 256 / 294

The following measurements are displayed on the CDP screens.
Data Code Power - The Data Channel in EVDO consists of 16 "I" sub channels and 16 "Q"
sub channels. Each of these channels should have a power around –15.05 dB, relative to the
total Data Channel power. When connected to a good signal source, the Data Code Min is
usually larger than –15.5 dB and the Data Code Max is usually less than –14.6 dB. The
smaller the difference between the two, the better the signal quality.
MAC Code Power - MAC channels are Walsh despreaded into 64 sub-channels (physical
layer Subtype 0 or 1) or 128 sub-channels (physical layer Subtype 2).
For Subtype 0 and 1 physical layers:
·
Channel 0~3 (white bars) are reserved.
·
Channel 4 (blue bar) is the RA (Reverse Activity) channel.
·
Channel 5~63 (alternate orange and yellow if active, grey if inactive) are channels that
control each individual "Access Terminal" (for example, cell phones, laptops). The
more active channels there are in channels 5~63, the more EVDO users are communi-
cating with the base station.
For Subtype 2 physical layer:
·
Channel 0~3, 5, 64~71 and reserved (white bars)
·
Channel 4 (blue bar) is an RA channel
·
Channel 6~63 and 72~127 are channels that control each individual access terminal
The following additional measurements are displayed on the Over-the-air measurements
screen:
Pilot Scan - The strongest six PNs received are displayed. The length of the bar represents
the absolute power of the signal in dBm. To the left of the bar is displayed the PN number
of the pilot. To the right of the bar Tau and Ec/Io are dispalyed. This graph is not meaning-
ful if the PN search is set to
No Trigger
.
Multipath - The length of the bar represents the absolute power of the signal path in dBm.
To the left of the bar, the timing error (Tau) is displayed, to the right of the bar, Ec/Io is dis-
played.
Pilot Dominance - The strength of the strongest pilot compared to the next strongest pilot in
the same channel. This should be >9 dB to make good measurements.
Multipath Power (available only with OTA - Option 33)
The amount of power in the dominant signal which is being spread in time due to multipath
echoes. This should be <0.4 dB to make good measurements.
The following measurements are displayed on the RF screens:
Meas Occ BW - The measured occupied bandwidth is calculated as the bandwidth contain-
ing 99% of the transmitted power.
Idle Data Power -The average power of the data channel portion of the idle EVDO slot that
is captured. If no idle slots are captured, then the unit will display N/A.
18-6
Chapter 18 EVDO Mode