Allied Telesis AT-MC605 - Manual (Page 26)

Overview
26
NO LIMIT/RATE LIMIT VDSL Configuration Switch
The NO LIMIT/RATE LIMIT (Right Center) switch selects the maximum
data rate for the VDSL line. The NO LIMIT position is the factory default for
this switch, which allows a maximum downstream data rate of 100 Mbps
and and a maximum upstream data rate of 60 Mbps. The RATE LIMIT
position limits the downlink and uplink line rates to a symmetrical mode
where the line rates in both directions are approximately the same.
6 dB/9 dB VDSL Configuration Switch
The 6 dB/9 dB (Right) switch selects the optimum signal to noise ratio
(SNR) for your VDSL line which is dependent on the VDSL line length.
The factory default setting for this switch is 6 dB SNR and assumes that
your VDSL line is less than 305 meters (1000 feet) in length. Select the 9
dB SNR setting if your VDSL line is between 305 meters and 3000 meters
(9842 feet) or if a more stable link and more noise protection is needed.