I'm not sure they do, but you need to confirm the upstream IP Profile to see if you're on Infinity 1 or Infinity 2. You can do this remotely by running https://windows.mouselike.org/be/index.asp?DoAction=...

The downstream speed of 9998 given an attainable of 22808 looks suspiciously like Infinity 1 to me;

The current Downstream BRAS rate is: 50.93 Mbps
The current Upstream BRAS rate is: 10 Mbps

Edited by caffn8me (Tue 16-Aug-16 19:40:24)

Not quite. You said "There's now no significant difference between attainable speeds either from the study socket or the basement master test socket". For the purpose of detecting/(suspecting) line banding, attainable is useless. Only the actual sync matters, preferably from the test socket.

A big giveaway in some cases is that a re-sync gives an identical actual. Attainable may differ.

Yes but it may have been banded at that due to severe instability. You just need to confirm the upstream IP Profile to know and then be able to raise it with BT customer irritation to move you to Infinity 2 if you're on the wrong package.

AIUI, banding won't change the attainable. It's the downstream attainable being well below the VDSL B low and very low considering the upstream attainable that's the problem. The clue is in the title.

Before any banding can be considered, the attainable needs to be got to where it should.

That's what I want help with.

Have it your own way.

Moving to BT Infiinity 2 at the moment is a waste of time because the attainable is so low.

If it is on Infinity 1 then moving to Infinity 2 is an important first step as you're syncing at almost the maximum for Infinity 1. You're unlikely to get an engineer visit as you're already at near-enough maximum sync.

Then you should find out if your cabinet is a Huawei and if so use a modem that supports G.INP which will improve your sync.

Cabinet is Huawei and the HH5 supports G.INP

Only if it's a HH5 type B