Having recently moved from VM DOCSIS 3.0 to Sky VDSL2 I'm curious about the details of how my new broadband service works.
I switched to Sky Fibre Max just over four weeks ago on an EO line of about 150m length. The fibre cabinet is placed in the exchange compound.
Initially sync rates were 79987 / 19999 with a d/s loss of 9.9dB and SNR margin of 18.7dB.
Initially the connection was very stable with very little variation in loss or SNR and no line resync.
Just over two weeks after installation the modem resynced overnight and came back up at 79999 /19999. At the same time the SNR margin dropped to 17.5dB and then about a week later to it's current 16.2dB.
The line still seems very stable. Upstream noise margin has not changed from the initial 23dB.
Whilst it could be that this change in SNR margin is caused by additional connections to the cabinet causing crosstalk, it seems strange that the change occurred overnight.
As an alternative explanation I was wondering if DLM may see my line as particularly stable on the original high TX power.
Could it then instruct the DSLAM to reduce this power in stages to help reduce the crosstalk from my line on to others in the same bundle?
Thanks for any insight.