2016-05-02 Experiences with vectored VDSL and amateur radio transmissions
It is a while after my last report on Vectored VDSL and the influence of amateur radio transmissions and it's time to share the current experiences especially with the change to the DrayTek Vigor 130 VDSL modem. The first conclusion is that the modem doesn't matter much. I am now used to the connection dropping and retraining when I start on a 'new' frequency. I haven't figured out yet what the exact definition of 'new' is, when I haven't been active for a number of days on 20M PSK31 the first transmission on that band can trigger the disconnect. There seems to be no direct influence on the maximum speed after the reconnect, it sometimes goes up. A serious change of frequency (different band or a different part of a band) can trigger another disconnect. In the mean time an xs4all user shared after long debugging of vectored VDSL problems to have found the cause in the PLC (powerline communications) network devices as delivered by xs4all for television over IP. Yet another reason to not use PLC. But in the ideal world the lastmile connections for high speed would be fiber-based anyway.