30 MDS iNET 900 User’s Guide MDS 05-2806A01, Rev. A
• Data Rate—Over-the-air data transmission rate. Options are
256 and 512 kbps. The higher rate is possible with strong RF
signal levels (> –77 dBm RSSI including a 15 dB fade margin)
Data throughput will be slightly less in the presence of interfer-
ence and with the high numbers of retransmissions.
• Dwell Time—Duration of one hop on a particular frequency
in the hopping pattern. (This field is only changeable on an
Access Point. Remotes read the AP’s value upon association.)
• Beacon Period—Amount of time between Beacon trans-
missions (msec).
Recommended Beacon Intervals: 52, 104, 208, 508 millisec-
onds. These values provide relatively quick association times
where 52 is very fast (≈ 5 sec), 104 is fast, 208 is medium and
the largest recommended value, 508 is slow (≈ 60 sec).
TIP: Increasing the Beacon Period will provide a small
improvement in network data throughput. Shortening it
decreases the time needed for Remotes to associate with
the AP. A short period is usually only a benefit when there
are mobile iNET 900 Remotes in the network.
• Hop Pattern Seed
(Access Point Only)—A user-selectable
value to be added to the hop pattern formula in an unlikely event
of identical hop patterns of two collocated or nearby iNET 900
networks. Changing the seed value will minimize possible
RF-signal collisions of iNET units. (This field is only change-
able on an Access Point. Remotes read the AP’s value upon
association.)
• Fragment Threshold—Maximum packet size, in bytes,
allowed before fragmentation occurs.
• RTS Threshold—Number of bytes for the over-the-air
RTS/CTS handshake boundary. (See “NETWORK PERFOR-
MANCE NOTES” on Page 56.)
• RSSI Threshold—Level (dBm) below which connection is
deemed to have degraded, and an alarm condition is generated
and logged.
• SNR Threshold—Value (dB) below which the wireless net-
work connection is deemed to have degraded and an alarm con-
dition is generated and logged.
• Country—Operation compliant to country-specific restric-
tions into the frequency hopping algorithm.
Brazil: Operation restricted to the 902-907.5 and 915-928 fre-
quency bands. This option must be specified when the order is
placed and cannot be modified in the field by the user.
• Skip Zone Options
(Access Point Only)—Display of current
utilization of zones. Each zone consists of eight RF channels.
(See “Skip Zone Options Menu” on Page 31.)
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