User manual

Chapter 2 - Managing a Single Device/Cell Performance Parameters Page
AlvariCRAFT Device Manager 154 User Manual
2.23.12 Recommended Maximum Modulation Levels
Retries on Lower
Modulations
This option enables/disables the retransmissions on lower
modulations mechanism described above.
The default value is Disable
RTS Duration Mode If the RTS mechanism is enabled, when attempting to retransmit
frames on lower modulations, the RTS employed may be adjusted so
that it pertains to either the initial transmission modulation or the
lower retransmission modulation. The available options are:
 Short RTS Duration: Retransmission attempts on lower
modulations use the RTS duration that applies to the initial
transmission modulation.
 Long RTS Duration: Retransmission attempts on lower
modulations use the RTS duration that applies to the
corresponding lower retransmission modulation.
Adaptive Modulation
History Size
This parameter is applicable only to VL 900 units. It indicates the
number of entries used by the Adaptive Modulation algorithm to
compute the transmission time.
The available range is from 15 to 25.
Packet Threshold to Test
Upper Rate
This parameter is applicable only to VL 900 units. When the number
of frames transmitted on the current modulation reaches this number,
the Adaptive Modulation algorithm will test the upper modulation.
The available range is from 10 to 10000
Packet Number on Upper
Rate
This parameter is applicable only to VL 900 units. It indicates the
number of frames used by the Adaptive Modulation algorithm to test
upper modulations.
The available range is from 1 to 3.
SNR Maximum Modulation Level
SNR > 23 dB 8
21 dB < SNR < 23 dB 7
16 dB < SNR < 21 dB 6
13 dB < SNR < 16 dB 5
10 dB < SNR < 13 dB 4
8 dB < SNR < 10 dB 3
7 dB < SNR < 8 dB 2
SNR < 7 dB 1