You clearly have an unlocked modem. (Unless you are using 3rd-party kit).
With an unlocked modem you need to run xdslcmd info --pbParams. I think "Max" will be what would be possible after the Discovery phase. The sync is what results from the Medley phase, where certain tones have been dropped for whatever reason.
The "Max" will vary second by second following the sync, because of noise conditions changing, in the same way as noise margin does.
Connection - Plusnet UnLim Fibre (FTTC). Sync ~ 59.4/14.4Mbps @ 600m. - BQM
"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
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Edited by RobertoS (Fri 20-Dec-13 13:18:55)