Adsl Connectivity Issues

[Supernova]

I usually check my router stats on a daily basis. Under normal circumstances, my SNR margin ranges from 10dB-13dB; with it occasionally dropping to 8dB during peak hours. Line Attenuation is 56dB (+/- 0.5dB); I live 4km from the exchange. Line rate 2048/512. These numbers have been consistent during the 2.5 years I had Adsl service. My connection has been rock solid, no problems whatsoever.

That's the way things were, until...

About 4-5 days ago, I noticed a (dramatic) drop in sync speed -- from 2Mbps to as low as 1.2Mbps. SNR margin has also taken a beating; down to 6dB. Line Attenuation increased to 59dB. SNR frequently drops below 6dB making the connection very unstable. There's also an increase in line errors reported in the router stats. Checked the phone, didn't hear any static. Reset the router to factory defaults, upgrading firmware does nothing. Maybe something is going on at the DSLAM or perhaps a bad cable...

Any thoughts?

[RubbaJohnny]

This is common here

Had TOT guys over so often they are par5 of the family though we live in the sticks 75kkm from exchange hae similar performance to your lower figures.I am surprised at such jejune performance in town .

Perhaps a new router/modem may help I am sure your server can bringone to test free especially if you say you are condsidering switching.

\In some areas of C Mai I believe there is a wifi option?

Good luck

PS how did you test attenuation?

[welo]

My neighbours modem stopped working about a week ago. The DSL line would not sync anymore at all. Brought the modem over to our place and it worked like a charm. Didn't bother to check the SNR and stuff.

Phoned TOT and they stopped by today. They are always very friendly and eager to help, but it seems somehow limited in their means

As reported on another thread they wanted to exchange the modem since it was 'broke' (and charge 1400 THB for the new one).

When I joined I pointed out that the modem worked perfectly fine on my line which is on the same property a shear 15 metres away.

I upgraded the firmware from 6.1.x to 7.4.3.2 and now it works like a charm.

Maybe TOT is introducing some new tech toys (protocols, hardware, honestly I have no idea about what's going on on the other end of the line) and the old firmware cannot deal with it properly.

Or maybe the line deteriorated for whatever reason and the newer firmware has better software to deal with the noise.

To be honest first I suspected some scam organised by TOT to make a bit of money with clueless users (of course they wanted to take the old 'broken' modem with them )... I'm getting paranoid LOL

welo

[welo]

Just noticed you had already upgraded the firmware.

Did you find out what's going on?

welo

[Supernova]

As I mentioned in my first post, line rate has never dropped below 2048 (2Mbps). While the attainable rate is upwards towards 3Mbps or greater. For the past week, my line rate hasn't exceeded 1856Kbps with SNR of 7dB-8dB. As I type this, I'm connected at only 1280Kbps, SNR 9.8dB. TBH, I don't know what the problem is.

Could a faulty router be put to blame? I suppose... I don't experience dropouts unless SNR drops below 3dB (which is rare). Line Attenuation has hit the 60dB mark, a 4dB increase from what it used to be. I consider this to be significant; Attenuation as I understand it, is supposed to be consistent with fluctuations no more than +/- 0.5dB.

I will be calling my ISP today to have them do a port reset. Not expecting any miracles though.

[Supernova]

What I'm concerned about are the number of Super Frame, HEC, RS Uncorrectable, SES (Severe Error Second) errors within a period of 30 minutes of uptime. This definitely isn't normal.

[Supernova]

Called my ISP, put in a request to have my line checked. Waiting for results...

ADSL stats as of 5 pm: