GE MDS MDS iNET-II 900, Справочное руководство

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54 iNET Series Reference Manual 05-2806A01, Rev. H
TIP: Lower the
RTS Threshold
as the number of Remotes or
overall over-the-air traffic increases. Using RTS/CTS is a
trade-off, giving up some throughput in order to prevent
collisions in a busy over-the-air network.
The
RTS Threshold
should be enabled and set with a value
smaller than the
Fragmentation Threshold
described above.
RTS forces the Remotes to request permission from the
AP before sending a packet. The AP sends a CTS control
packet to grant permission to one Remote. All other
Remotes wait for the specified amount of time before
transmitting.
•
RSSI Threshold (for alarm)
—Level (dBm) below which the
received signal strength is deemed to have degraded, and a crit-
ical event (alarm) is generated and logged. Under these condi-
tions, the
PWR
lamp flashes, and an SNMP trap is sent to the
configured SNMP manager. [
0 to -120; -90
]
•
SNR Threshold (for alarm)
—Value (dB) below which the sig-
nal-to-noise ratio is deemed to have degraded and a critical
event is generated and logged. Under these conditions, the
PWR
lamp flashes, and an SNMP trap is sent to the configured SNMP
manager. [
0 to 40; Not Programmed
]
•
Channel Con fi g
(Only applies to iNET-II)
—Brings up the submenu
discussed in Channel Config Menu on Page 55.
•
RF Hopping Format
(Only applies to iNET)
—This option must be
specified when the order is placed and cannot be modified in the
field by the user. Operation must be compliant with coun-
try-specific restrictions. The available formats are:
•
ISM
: 902–928 MHz band
•
GSM
: 915–928 MHz band
•
SPLIT
: 902-907.5 and 915-928 MHz bands
•
CHANNELS
: 902–928 MHz, individual channels selectable
within this range
•
Skip Zones
(Only applies to iNET. Editable at AP Only.)
—This selection
brings up a submenu discussed in Skip Zones Menu on Page 56.
•
Auto Data Rate Con fi guration
—This selection brings up a submenu
as shown in Figure 2-28. For the settings in this submenu to
have any effect, the Data Rate menu item (Page 52) must be set
to
AUTO
.
2.5.2 Channel Config Menu
The Channel Configuration menu displays the utilization of channels in
the 902–928 MHz range. This selection is available only on iNET-II or
specially provisioned iNET units. The radio hops only on the channels
selected in this menu.