Picked this up from a tbb thread:
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Like the Netgear the SNR on the 7800N can be lowered to increase the sync speed (on 1.06a and above), however unlike the Netgear, the effect is permanent so even if you reboot the router your SNR stays at the new low value.
To all those that have the Billion 7800N this is the procedure to alter the SNR:
go to http://192.168.1.254/snr.cgi
and enter one of the values below and save.
standard values are.
200 = +6dB
150 = +3dB
100 = +0dB
50 = -3dB
25 = -4.5db
1 = -5.5dB
The command does not accept negative numbers. However the command can be tricked into accepting negative numbers by entering high positive numbers.
65500 = -9dB
65480 = -9.5dB
65450 = -12dB
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I think these are 'delta' figures, eg 50 will reduce the SNRM by 3db, not set it to -3db. I don't have an ADSL connection to test it with, so if it doesn't work don't blame me!
Thanks Bill, I think apart from adslmax the other use for this is non BT adsl2+