Dropping Sync Rate

[Conrad]

My sync rate is gradually decreasing
I used to get a rock solid sync of 18k, but over the last few weeks it has been gradually dropping (only had one power-cycle during that period as far as I am aware).  It is now at 828 / 13,539 (up/down).  How much further do I allow it to drop before it could get looked at as a fault?

I guess I should try an alternative router first. Or perhaps replace the filter?

[Lance]

Certainly trying a new filter is a good idea - as is a router if you have one to hand.

[Bill]

over the last few weeks it has been gradually dropping (only had one power-cycle during that period as far as I am aware).

It could be "just one of those things"... I used to get better sync in the summer than the winter, especially on ADSL2+.

Never did really get to the bottom of it, but central heating systems between me and the exchange (just over 1Km away) were near the top of my list.

But as Lance said, the filter and router won't be above suspicion either.

[Steve]

You get more interference at night whether it's due the fact that radio waves particularly AM travel further at night time I don't know. May explain one possible reason for the winter summer difference

[Bill]

There was a noticeable day/night noise variation which was quite possibly due to radio transmitters, but it wasn't usually enough to cause a re-sync.

But as winter came and went there were also noise increases in the early morning and evening, around the times people would be getting up or arriving home and wanting warm houses.

Could have been other things of course, but as it didn't seem likely that I could do anything about it I just put up with it and waited for the warmer weather

[pctech]

Those pesky people wanting warm houses, isn't a balmy 21 degrees enough for them.

[Simon]

That's too hot for me indoors.  18C does me fine. 

[Rik]

The other issue I've noticed is that ambient temperature affects sync speed, I expect to get 500k more in summer than winter.

[pctech]

Think thats something to do with the expansion and contraction of the phone lines.

[Rik]

It has to be, Mitch, but it seems perverse to me. In summer, lines should be longer, therefore lower sync. In winter, lines should be colder, therefore, lower resistance.

[Bill]

It has to be, Mitch, but it seems perverse to me. In summer, lines should be longer, therefore lower sync.

True, but the bits don't expand as much as the metal in the line, so more of them fit in the length

[Rik]