The router has a SYNC-light which shows if the ADSL link to exchange is up. There is also a NET-light which shows if logged into ISP and any traffic. Also LAN-lights for each lan port.
The router is set to connect-to-ISP on command. If I'm at computer and look at router seeing only SYNC-light on then to get online I initiate a 'ping xxxx' in a terminal. I see the LAN-light flicker and a couple secs later the NET-light comes on and I see the ping result, off I go using the internet.
Now, I happen to look at the router and only SYNC-light is on but then it goes off for about 10secs, flashes slow then fast, maybe repeats and then goes steady. This means that something has caused a re-sync or IOW I had a sync loss.
This time when I initiate a 'ping xxxx' I see the LAN-light flicker and......nothing. I try another command which should get the router to connect-to-ISP but nothing here either.
I fire up browser and log into router. I go to Maintenance and page which can show tech details including the UP/DOWN line attenuation, power and SNR margin. I see that the SNR margin downstream is '-x' and 'x' can vary, in the times this has happened, from 1 to 8. So the SNR margin is showing a _negative_ db figure.
When things are normal I see it vary between 6 and 11. Otherwise the other parameters always stay much the same within +/-1.
These are the figures for majority of time.
noise margin upstream: 25 db
attenuation upstream: 12 db
output power upstream: 9 db
noise margin downstream: 6 db [between 6-11]
attenuation downstream: 25 db
output power downstream: 23 db
This page has an adsl reset button, so I click on that. After a few secs the SYNC-light goes off and does the slow/fast flash then goes steady. I recheck the details and it's usually returned to a positive figure. I say 'usually' because some times when I've been online and suffered a few sync losses inside 30mins or so, I do the reset and it still comes back with a '-x' number. Maybe the second or third reset will fix it.
And note that I get the same Down SNR margin '-x' trying 2 other different devices when there seems to be a period of sync losses. And one of them will show a 10 digit +ve number 2147365248 at times.
And note this happens in the Test Socket too. Standard phone (or none) and no wireless.
I'm about 1.5Km from exchange and lines are underground.
This can happen more so when some days of very wet and windy weather but just as likely to get a chunk of re-syncs when it's fine. Times of day vary too. The phone line gives a very gentle hiss though at the stormy times I did hear a mild level increase and the odd 'spzz' and 'shhkrss' but not, I'm sure, what would warrant a BT fault.
Started a few months back when I got moved to 21CN. Had been rock solid beforehand with an 8128 sync. The sync now shows 14333.
Is it still too "general" to point the finger at a certain part of the chain, or what do people think?