Yes, my ISP had me check that out. With a Windows 7 PC plugged directly into the LAN socket of the modem the BT test results are the same.
I did recently power off the modem, leave it for half hour and power it back on without anything plugged into the LAN. It ran through its light sequence and then stalled with the DSL light flashing constantly. Without being able to get at the modem log I can only assume this indicated a failure to sync at all. Another power cycle got it to come up but on plugging in the router the stats and test were the same.
So,really it seems my problem is this.
1) I had what appeared to be stable 28 Mbps connection day one which lasted at least a week or so when I got bored with the daily testing and gloating and stopped monitoring.
2) Sometime during the next two months my connection dropped by half to a constant 15 Mbps. This happened either suddenly or gradually.
3) The only clue as to the reason is the occasional (maybe weekly) failure of the router to establish a connection and the fix is a power cycle of the modem. There is no outward indication from the modem that there is a problem.
4) I cannot get the modem stats as BT, in their perverted wisdom, have locked out the modems.
Nothing has changed with the setup within the home.
My solutions seemed to be.
1) Wait and see if it spontaneously recovers. This happened once before with a poor ADSL2 throughput that BT claimed they could not diagnose.
2) Beg, borrow or steal a more useful modem. May even buy one.
3) Get BT Openreach to come out and run local diagnostics and be prepared to fork out 100 notes when they say, "no fault detected, the line is performing within spec".
Thanks to all who replied.
Couple of questions.
If the fault is external and it fixes itself, does the modem instantly sense this and re-sync at a higher rate or does it require a modem reboot to achieve this?
Has anyone any experience with this modem on BT FTTC?
Billion BiPAC 8200M VDSL2 Fibre Broadband Modem
Edited by TheValk (Thu 14-Jun-12 14:37:38)