05-2806A01, Rev. L
MDS iNET Series Reference Manual
119
4.4.6 Station-to-Station Traffic
When sending frames from an endpoint connected to one transceiver
to
another
endpoint with a different
transceiver, the throughput will be halved at best. This is because all frames must go through the AP and
thus are transmitted twice over the same radio system. Therefore, in the previous 100-byte UDP example,
the number of over-the-air bytes will be 380 bytes (190 bytes x 2) if the frame has to go station-to-station.
4.4.7 Interference has a Direct Correlation to Throughput
Interference could be caused by other radios at the same site, in nearby locations, or by high power trans-
mitters such as paging systems.
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 Configuration>>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 Configuration>>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 Configuration>>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 Configuration>>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 Configuration>>RTS Threshold
)
5. Activate compression on the Radio Configuration Menu (
Compression 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 significantly lower value (2% reduction) probably indicates inter-
ference. Performance can be improved by blocking the affected zones at the Access Point. (
Main
Menu>>Radio Configuration>>Skip Zone Option
)
7. Use the
Performance Information Menu
to check for errors, retries and dropped packets. Do the same with
Ethernet traffic.
With weak signals, interference, or hidden nodes, the optimal performance may be lower due to colli-
sions and retries.
Summary of Contents for MDS iNET Series
Page 12: ...x MDS iNET Series Reference Manual 05 2806A01 Rev L...
Page 159: ...05 2806A01 Rev L MDS iNET Series Reference Manual 147 Figure A 22 EDS Wizard Completion Screen...
Page 165: ...05 2806A01 Rev L MDS iNET Series Reference Manual 153 NOTES...
Page 166: ...154 MDS iNET Series Reference Manual 05 2806A01 Rev L NOTES...
