MDS 05-2806A01, Rev. E.1
MDS iNET 900 Series User’s Guide
53
Invisible place holder
Figure 3-22. Auto Data Rate Menu
NOTE:
In the description below, “high speed” refers to 512 kbps for
the iNET radio and 1024 kbps for the iNET II radio.
“Standard speed” refers to 256 kbps for the iNET radio and
512 kbps for the iNET II.
The Auto Data Rate Configuration submenu consists of two threshold
settings, each accompanied by a “delta” (amount of change) setting.
Using the example of
Figure 3-22
, assume the current RSSI is -87 dBm.
An RSSI reduction of more than 5 dBm (more negative RSSI number)
would cause a data rate change from high speed to standard speed. Once
the data speed has changed to standard speed, an RSSI increase to the
level of -82 dBm would be required for the radio to switch back to high
speed. This provides an operational “window” or hysteresis range over
which the data speed stays constant despite minor changes in signal
strength.
The SNR (signal-to-noise ratio) threshold and delta operate in the same
manner described above, with the exception that the units are expressed
in relative dB instead of dBm. In the example of
Figure 3-22
, a drop of
2 dB from a level of 26 dB would result in a data rate change from high
speed to standard speed. For the radio to return to high speed, the SNR
would need to increase to 28 dB. (See Glossary for definition of SNR.)
RSSI or SNR figures alone mean little when determining signal quality.
Both parameters must be considered to get a true understanding of signal
quality. For example, a strong, but noisy signal would likely be less
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.
Summary of Contents for iNET 900 Series
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