In order for rateshift to upshift the link after it has downshifted, the following conditions must be met with Giga 2.5.
If the target is set to -48, the speed will upshift if:
1) The actual RSSI is -52 or greater (-48-4) at the end of 5 minutes after
it first passes the target-4 dB threshold.
2) The MSE is greater than -30 dB at the end of 5 minutes after it first
passes the -30 dB threshold.
In previous software releases for Giga, it was required that the target rssi be set 3-5 dB below the actual/normal unfaded RSSI. It is still suggested that the targetrssi be set about 3 dB lower than the normal operating RSSI, since the antenna may move in high winds during a storm.