No where's a thing.
I am about 3 km from a fibre cabinet and thanks to past help from this forum, plus my trusty ZyXel SBG 3300N I've enjoyed >15 mbps download for a few years. Not enough to play Universe Of Death or whatever with someone in Hawaii but fine for a family of Netflix addicts..
The other day it dropped to 8 mbps and I saw that ip profile had dropped to 8 mbps and did not respond to forced resync, despite >13dB SNR margin, which implied a max supportable data rate > 17 mbps.
So I went through the BT Level 1 / Level 2 / Engineer Call dance with all its "have you done this and that, please reset this and that".
When the technician turned up (BT Modem and Homehub now re-installed) I explained all this and he said he could only see 6 dB SNR margin.
I persuaded him to reset it to remove the cap and the speed rose to 9 mbps, on the BT kit.
"Good, the cap's gone", I said. Now lets try it on the ZyXel.
Remember, the BT kit synched at 9 mbps where it showed 6 db margin, (as you'd expect: I think it adapts to that margin).
Plugged in the ZyXel box: Ta Da ! 18 mbps, all back to normal. 6 dB SNR margin but a far higher data rate.
Error levels etc all acceptable.
This begs two questions.
1) Why did BTW system cap the ip profile: intermittent/one-off line noise event?
2) Why does another (costlier) modem work so much better?
A-B-A comparison to the BT kit consistently shows it to be way faster.
Interesting, eh?
PS I do not work for ZyXel (!) and I think their documentation is poor. This box can do ANYTHING - if you can figure out how to ask.
