cocospm wrote: I'm on the 40/10 FTTC with PlusNet, and with the 3.6.2_232201 Annex A firmware my 2850n performs about 20% lower upstream on typical throughput speed tests (e.g. mybroadbandspeed.net) than the Openreach modem does. Download speeds are only slightly lower with the 2850n vs. the Openreach modem.

With the standard 3.6.2_2111112 Annex B firmware, my 2850n upload throughput is only about 3 to 4% lower than the Openreach.

In all cases, VDSL sync speeds (actual data rate) are identical on the 17a VDSL profile.

boe323 wrote: bt have pushed somekind of virus on the line to detect whether its there equipment or 3rd party equipment which sounds more likely to be the case. so when it sees that its not bt equipment it lowers the sync to make you beleive that there equipment is superior.

babis3g wrote:

boe323 wrote: bt have pushed somekind of virus on the line to detect whether its there equipment or 3rd party equipment which sounds more likely to be the case. so when it sees that its not bt equipment it lowers the sync to make you beleive that there equipment is superior.

hmmmm i was thinking may be something stops the synchronisation... probably a command....don't forget the dsl is monitoring the connection and reacts dependently
it make sense as they only really allow you to use BT modem
i see few having issues but draytek vdsl modems in general can not be so outdated
i mean i understand if someone is far from cab and speeds going down due to different chip-pest of modem and cabinet etc but close to cab perhaps no matter what modem is, should be ok or at least not much lower speeds