Tsunami™ QB-8100 Series (50 Mbps / 12 Mbps)

Advanced ConfigurationMaximum RateThis parameter specifies the highest data rate that can used for DDRS. By default, it is set to130Mbps.NOTE: DDRS selects the transmission rate between the configured Minimum andMaximum Rates.Lower SNR CorrectionUpper SNR CorrectionRate Increment RTXThresholdRate Decrement RTXThresholdChain BalanceThresholdRate Back Off IntervalThis parameter specifies the correction factor to be added with “Minimum Required SNR”for a data rate, for the purpose of removing the data rate from valid rate table. By default,it is set to 0 dB.This parameter specifies the correction factor to be added with “Minimum Required SNR”for a data rate, for the purpose of adding the data rate to valid rate table. By default, it isset to 3 dB.This parameter specifies a threshold for percentage of retransmissions, below the rate canbe increased. By default, it is set to 25%.NOTE: If the percentage of retransmission is between “Rate Increment RTXThreshold” and “Rate Decrement RTX Threshold” then current operation rateis maintained.This parameter specifies a threshold for percentage of retransmissions, above the rate canbe decreased. By default, it is set to 30%.NOTE: If the percentage of retransmission is between “Rate Increment RTXThreshold” and “Rate Decrement RTX Threshold” then current operation rateis maintained.In the case of MIMO, the difference in SNR between two chains must be less than or equalto this threshold for the chains to be considered as “Balanced”.By default, it is set to 8 dB.NOTES:• This parameter is applicable only for “Auto” stream mode.• When “Auto” stream mode is configured and if chains are not balanced, thenSingle Stream rates are considered valid.The DDRS algorithm constantly attempts higher data rates, when the current rate is stable.If not successful, it goes back to older stable rate. Before the next attempt it waits for aminimum duration. This duration starts with 10sec and increases exponentially up to RateBack Off Interval and remains at this value. By default, it is set to 300 seconds.Table 4-1 DDRS Minimum Required SNR TableRate IndexLegacy Mode EnabledMinimum Required SNR (dB)Single StreamDual Stream1 7 92 10 133 13 164 16 195 20 256 25 287 28 318 31 34Tsunami QB-8100 Series (50 Mbps / 12 Mbps) Installation and Management Guide 54