Controlling ADSL sync rate

Is it possible to control the sync rate for a MaxADSL connection? My MaxADSL
won't settle to a steady sync rate so I want to try and pin it at e.g. 2Mb.
The ADSL interface is basically ATM.

Config is below.

Thanks,

John Rennie

----8----
no service pad
service timestamps debug uptime
service timestamps log uptime
service password-encryption
!
hostname Ratsauce
!
logging buffered 4096
enabl ..
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Tags: Telecom cabling VoIP Broadband cat5