User's Manual Part 3
Release8OperationsGuide
Issue2,November2007 Draft5forRegula toryReview 450
Indicators for configuration source are explained under
Session Status Tab of the AP on
Page 193
.
27.7 USINGTHEBERRESULTSTOOL(SM,BHS)
Radio BER is now supported on hardware scheduling. When looking at Radio BER data
it is important to note that it represents bit errors at the RF link level. Due to CRC checks
on fragments and packets and ARQ (Automatic Repeat reQuest), the BER of customer
data is essentially zero. Radio BER gives one indication of link quality, along with
received power level, jitter, and link tests.
BER is only instrumented on the downlink, and can be read on each SM’s Tools>BER
Results page. Each time the tab is clicked, the current results are read, and counters are
reset to zero. An example of the BER Results tab is displayed in Figure 164.
Figure 164: BER Results tab of SM, example
The BER Results tab can be helpful in troubleshooting poor link performance. The value
in the Measured Total Bit Error Rate field represents the bit error rate (BER) in the RF
link since the last time the BER Results tab was clicked.
The link is acceptable if the value of this field is less than 10
−4
. If the BER is greater than
10
−4
, re-evaluate the installation of both modules in the link.
The BER test signal is only broadcast by the AP (and compared to the expected test
signal by the SM) when capacity in the sector allows it – it is the lowest priority for AP
transmissions.