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Apparent solution to upstream synch rate problems

Community Veteran
Posts: 38,460
Thanks: 1,027
Fixes: 62
Registered: 15-06-2007

Apparent solution to upstream synch rate problems

I only post this because it may be of interest to other users.
I have been struggling for some time with loss of upstream synch with the rate dropping from 448kbps at 20dB to as low as 128kbps at 6dB noise margin.
Changing filters and phones didn't solve the problem.
Having done a search on Google I found a number of reports where double filtering a fax machine solved a similar problem. Worth a try so I added an extra filter between my filtered faceplate and the phone and answering machine.
It has now held synch at 448kbps  for  over 5 1/2 days - still keeping my fingers crossed  Grin
Edit - note I do not have a fax machine
5 REPLIES
James
Grafter
Posts: 21,036
Registered: 04-04-2007

Re: Apparent solution to upstream synch rate problems

Thanks Jim.
That's certainly another one for the list.
Community Veteran
Posts: 6,735
Thanks: 12
Registered: 02-02-2008

Re: Apparent solution to upstream synch rate problems

I've seen similar suggestions for Sky boxes and DECT phones as well.
Community Veteran
Posts: 38,460
Thanks: 1,027
Fixes: 62
Registered: 15-06-2007

Re: Apparent solution to upstream synch rate problems

Still rock solid except the router decided to do a reboot yesterday - now connected at 448 / 3,488 with very few FEC errors and no problems.
Now to wait for 2 or 3 weeks to see if the automatic systems drop my default noise margin or I will again start ticket tennis in trying to get BT to alter it.
Community Veteran
Posts: 38,460
Thanks: 1,027
Fixes: 62
Registered: 15-06-2007

Re: Apparent solution to upstream synch rate problems

Original post updated to make it clear - I do not have a fax machine but using Google that was where I found the original reference to double filtering
Community Veteran
Posts: 38,460
Thanks: 1,027
Fixes: 62
Registered: 15-06-2007

Re: Apparent solution to upstream synch rate problems

Me and my big mouth  Sad
weather changed and I have just had three resynchs at 224kbps at 7dB