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useful in applications that rely on IP packets with small payloads, such as terminal server
operations or MODBUS polling. This setting must match on each radio (Remote and AP).
Power - The transmit power of the radio: Valid values: 20 - 40 dBm – DEFAULT is 40dBm
TX Frequency – The frequency at which the radio transmits.
RX Frequency – The frequency at which the radio receives.
Channel - Controls the channel bandwidth and symbol rate of the radio.
-
6.25 kHz-4.8 ksps - Channel width 6.25 kHz, symbol rate of 4.8 ksps
-
12.5 kHz-9.6 ksps - Channel width 12.5 kHz, symbol rate of 9.6 kbps
(DEFAULT)
-
12.5 kHz-10 ksps - Channel width 12.5 kHz, symbol rate of 10 kbps
-
25 kHz-16 ksps - Channel width 25 kHz, symbol rate of 16 kbps
-
25 kHz-20 ksps - Channel width 25 kHz, symbol rate of 20 kbps
NOTE
Some channel configurations may not be available for use because of country restrictions.
Modulation – Sets the radio's modulation. You may select automatic (adaptive modulation),
or choose from three fixed modulations.
Adaptive modulation (DEFAULT)
-
QPSK
-
16QAM
-
64QAM
-
Automatic modulation adaptively selects which modem (QPSK, 16QAM, or 64QAM)
is used on a per-transmission basis. This is useful in networks with some remotes close
to the Access Point, and others farther away or obstructed. This mode allows the close
remotes to take advantage of the higher data rate for the directed messages, while the
remotes use a more conservative modulation.
Radios with fixed modulation settings will operate only at the modulation that you
specify. If the specified modulation is higher than the connection can support, no
traffic will flow. If the connection can support a higher modulation than the selected
modulation, the radio will not take advantage of this and will continue to use the fixed
modulation. We recommend that Adaptive Modulation be used in all cases other
than bench tests.
Theoretical throughput is based on modulation and channel settings. Please refer to
Table 5-5 above.
FEC -- Forward Error Correction is useful in controlling errors in weak connections. FEC
encodes data in a redundant fashion to allow data correction in a noisy or weak connection
without the additional overhead of retransmission.
-
Disabled (DEFAULT). No Forward Error Correction will be used. This option provides the
highest throughput and standard sensitivity, and is suitable for strong connections.
Low Gain – Provides better sensitivity, while still offering good throughput.
-
Adaptive – Provides the best sensitivity and standard throughput. Adaptive on a per-packet basis.
-
NOTE
It is critical to have FEC set identically on the AP and all Remotes.
78
MDS™ Master Station
MDS 05-6399A01, Rev. F
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