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Fade Margin
This is the difference (in dB)
between the received radio signal
and the receiver sensitivity (mini-
mum radio signal).
When automatic rate is selected, the RM-90
chooses a rate based on the received signal
strength of transmissions. The Fade Margin value
is used by the RM-90 to determine when to
change data rates. A larger Fade Margin means
that the RM-90 will reduce rates at higher signal
levels.
The default value is 10 dB.
Dwell Time
The amount of time, in millisec-
onds, the RM-90 remains on a
particular frequency whilst fre-
quency hopping
Reducing this value will improve performance
if there is a high level of radio interference
This also has an impact on the maximum size
of packet that may be transmitted. Refer to
“Fragmentation Threshold” for more information.
The default value is 400 milliseconds.
Beacon Period
This interval is the period
between beacon transmissions
sent by an Access Point.
The Beacon Interval is also related to the scan
period on a Client. Reassociation interval is (6)
times the Beacon Interval when the link has been
inactive.
Access Points will timeout after 12 times the
Beacon Interval if no response is heard.
Refer to Section 3.1 for more information.
The default value is 10 seconds. This should
be adjusted to larger values as the system is
increased in size. This will reduce the overhead
of checking each link, at the expense of response
time when a link is dropped.
Frequency Hopset
There are eight hopsets available
(0-7)
Selected automatically via the System Generator
String
