SIMREX DataMover ESS, User Manual

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SIMREX MAN.ESS-01, Rev. F DataMover ESS User’s Guide 57
SIMREX Corporation
useful than a weak signal with low noise levels. Proper use of the
threshold and delta settings will result in smoother, more reliable perfor-
mance from your wireless link.
Figure 3-21 shows the default values for RSSI and SNR parameters but
these may be changed to optimize performance in your environment. In
properly designed systems, experience has shown that RSSI levels
between -50 dBm and -90 dBm provide reliable operation, provided the
signal-to-noise ratio is 17 dB or above. Tailoring the thresholds with
these baseline values in mind, can provide improved performance in
your system.
The selections on the Auto Data Rate menu are as follows:
•
ADR RSSI Threshold—
A specified received signal strength
value, which, if exceeded by the range of the
RSSI Delta
set-
ting, causes a data rate change in the transceiver. [
-50 to -100;
-87 dBm
]
•
ADR RSSI Delta—
A user-specified difference from the
RSSI
Threshold
figure which, if exceeded, causes a data rate change
in the transceiver. [
0-10; 5
]
•
ADR SNR Threshold—
A user-specified signal-to-noise ratio,
which, if exceeded by the range of the
SNR Delta
setting,
causes a data rate change in the transceiver. [
10-30; 26
]
•
ADR SNR Delta—
A user-specified difference from the
SNR
Threshold
figure which, if exceeded, causes a data rate change
in the transceiver. [
0-10; 2
]
Radio Configuration Menu descriptions, continued...
•
Skip Zones (Does not apply to ESS-II. Editable at AP Only.)
—This selec-
tion brings up a submenu ( Figure 3-22 ) that displays the current
utilization of zones. Each zone consists of eight RF channels. In
some instances there may be a part of the spectrum used by
another system, that results in “continuous” or “persistent”
interference to your system. To alleviate this form of interfer-
ence, the transceiver may be programmed to “block out”
affected portions of the spectrum using the Skip Zones Menu.