The DSL Up to 4096kbps service has 4 sub-profiles, which are used to stabilize customers' service that experience re-synchs (service interruptions) on their ADSL lines due to last mile distance, noise and attenuation. Therefore customers that experience problems on the service may be accommodated on any of the secondary profiles below:
min sync rate: 640kbps; max sync rate: 4096kbps
min sync rate: 640kbps; max sync rate: 3072kbps
min sync rate: 640kbps; max sync rate: 2048kbps
min sync rate: 640kbps; max sync rate: 1024kbps
What the above entails is that if a customer does not sync at the profile listed in A above they will be accommodated on B, C or D depending on the line sync speed.
Customers will automatically be upgraded to the highest speed possible on the service that they applied for as per the profiles above. Where the DSL service is unable to connect (sync) at the speed applied for due to factors such as line length or quality will be accommodated down from the service applied for in 32 kbps decrements, but not lower than the minimum download speed, until the service connects (sync's successfully).
Once a customer's line syncs at a certain rate and at a later stage the line degrades the service will also be accommodated down in 32kbps decrements until sync is re-established, the downward synchronization due to line quality will happen automatically within the profile parameters.