GE MDS MDS iNET-II 900, Справочное руководство

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146 iNET Series Reference Manual 05-2806A01, Rev. H
4.4.8 Maximizing Throughput
Here are some suggestion on things to try that may maximize
throughput:
1. AP Only: Increment the
Dwell Time
to the maximum of 262.1 ms.
This lowers the overhead since it will stay longer on a channel. The
down side is that if a particular channel is interfered with it will take
longer to hop to another channel.
(
Main Menu>>Radio Con fi guration>>Dwell Time
)
2. AP Only: Change the
Beacon Period
to
Normal
(508 ms). This will
also reduce the overhead of beacons sent out. On the down side,
association time may be a little longer.
(
Main Menu>>Radio Con fi guration>>Beacon Period
)
3. Change the
Fragmentation Threshold
to the maximum of 1600. Longer
packets will be sent over the air reducing overhead. On the other
hand, if a packet is corrupted it will take longer to be retransmitted.
(
Main Menu>>Radio Con fi guration>>Fragmentation Threshold
)
4. Increase the
RTS Threshold
to 1600. RTS mechanism is used to
reserve a time slot if packets exceed this number. On the other hand,
a hidden-node might interfere more often than if RTS was not used.
(
Main Menu>>Radio Con fi guration>>RTS Threshold
)
Decreasing the
RTS Threshold,
to the 100 to 200 range, may improve
throughput on a busy network. It will add small packets, but reduce
collisions (and resulting re-tries) of large packets.
(
Main Menu>>Radio Con fi guration>>RTS Threshold
)
5. Activate compression on the Radio Con fi guration Menu (
Compres-
sion enabled
).
6. Use the
Performance Information Menu
to check the packets received by
zone. (Remotes Only:
Main Menu>>Performance Information>>Packet
Statistics>>Packets Received by Zone
)
Readings should be close in value. A signi fi cantly lower value (2%
reduction) probably indicates interference. Performance can be
improved by blocking the affected zones at the Access Point. (
Main
Menu>>Radio Con fi guration>>Skip Zone Option
)
7. Use the
Performance Information Menu
to check for errors, retries and
dropped packets. Do the same with Ethernet traf fi c.
With weak signals, interference, or hidden nodes, the optimal per-
formance may be lower due to collisions and retries.