Sudden SNR drop

DIABLO · 24 Oct 2015 at 17:52

Hi, guys what can cause a sudden SNR drop? My SNR a couple of days ago was rock solid at 11dB and then all of a sudden it dropped to 6.2dB on the downstream (the upstream SNR also dropped) but it did not effect my connection which had been stable for 6 days at 80000kbps

This is a newly enabled VDSL2 connection btw and i was monitoring the stats with DSLSTATS

VaderDSL · 24 Oct 2015 at 18:13

It's been a while, but when a new FTTC cabinet was installed where I used to live I was one of the first to be hooked up with Sky Fibre Pro and I had a high SNR and an almost max sync (80mb).

Now over the following weeks/months the SNR dropped steadily, but speed wise stayed almost the same (dropped to about 73) and I can only assume it was because more and more people in the area were going fibre, so could be that?

DIABLO · 24 Oct 2015 at 18:43

Hmm i doubt most people around here know what fibre is let alone that has recently been enabled in this town.

r7slayer · 25 Oct 2015 at 06:18

SNR or signal to noise ratio can be affected by a lot of things. Is your area recently enabled FTTC? Then it most likley is caused by a increase amount of people switching over the FTTC which is steadily increasing noise on the lines, or rather the copper bit anyways.

DIABLO · 25 Oct 2015 at 11:31

r7slayer said:
SNR or signal to noise ratio can be affected by a lot of things. Is your area recently enabled FTTC? Then it most likley is caused by a increase amount of people switching over the FTTC which is steadily increasing noise on the lines, or rather the copper bit anyways.

Yes it recently enabled, the drop in SNR happened instantly though not a gradual decline.

enigma27 · 25 Oct 2015 at 19:28

DIABLO said:
Hi, guys what can cause a sudden SNR drop? My SNR a couple of days ago was rock solid at 11dB and then all of a sudden it dropped to 6.2dB on the downstream (the upstream SNR also dropped) but it did not effect my connection which had been stable for 6 days at 80000kbps

This is a newly enabled VDSL2 connection btw and i was monitoring the stats with DSLSTATS

Who is your ISP?

Most ISP profiles will have a target SNR of 6.0.. this usually gives highest connection speed / stability

Your line will always start high then gradually get lower the first ten days.. don't switch the router on or off to much or it may make the system think you have errors and reset your profile.

michty_me · 25 Oct 2015 at 23:33

Possibly a neighbour has been activated and this has caused a bit of crosstalk on the copper side of the connection. The SNR would have dropped to maintain your current sync speed.

DIABLO · 27 Oct 2015 at 22:17

enigma27 said:
Who is your ISP?

Most ISP profiles will have a target SNR of 6.0.. this usually gives highest connection speed / stability

Your line will always start high then gradually get lower the first ten days.. don't switch the router on or off to much or it may make the system think you have errors and reset your profile.

Zen Internet

lost a bit more SNR and the the internet disconnected.

bremen1874 · 28 Oct 2015 at 00:44

If you're with Zen then ask them. You're paying for a premium service so you should get the associated support.

Dave2150 · 28 Oct 2015 at 08:06

bremen1874 said:
If you're with Zen then ask them. You're paying for a premium service so you should get the associated support.

Indeed, no point paying through the nose for a capped download/upload service from Zen and not making use of their support.

Best off being on Sky/BT completely unlimited and significantly cheaper connections if your not making use of their support.