POTS line quality help
in [Design]
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From: Martin Brown on 27 Apr 2010 08:40 Robert Baer wrote: > Martin Brown wrote: >> denali wrote: >>> FYI, RE: JB's post.. leased line parameters are in no way applicable >>> to switched services. Forget about 3002 channels, etc. >>> >>> Since you had better data service that has become degraded, something >>> is clearly wrong somewhere. >> >> Not wrong. Different. He should force a V34+ connection and see if >> that behaves any better - but he doesn't listen to advice. >> >> Most likely one of his neighbours has moved to ADSL and the engineers >> have pinched his real copper circuit for that. Multiplexed local lines >> do not carry 56k signals at all well. The older analogue technology >> modems are a bit more robust in that environment. >> >> Regards, >> Martin Brown > Well,now if i KNEW how to force V34+ i would try. You should pay more attention to the postings in this thread and also ask on comp.modems and/or us.telecom or whatever it is called. They will know where you can dial into for a DIY line bandwidth test. Assuming that end users are allowed to do such things in "the land of the free". You might find a prehistoric early 56k UK FAQ helpful in trying to configure your modem to work retro style. http://www.pierrot.demon.co.uk/faq/dtm.faq (it is well out of date and UK based but still has good hints) Regards, Martin Brown
From: denali on 27 Apr 2010 12:46 On Apr 27, 12:08 am, Martin Brown <|||newspam...(a)nezumi.demon.co.uk> wrote: > denali wrote: > > FYI, RE: JB's post.. leased line parameters are in no way applicable > > to switched services. Forget about 3002 channels, etc. > > > Since you had better data service that has become degraded, something > > is clearly wrong somewhere. > > Not wrong. Different. He should force a V34+ connection and see if that > behaves any better - but he doesn't listen to advice. > > Most likely one of his neighbours has moved to ADSL and the engineers > have pinched his real copper circuit for that. Multiplexed local lines > do not carry 56k signals at all well. The older analogue technology > modems are a bit more robust in that environment. > > Regards, > Martin Brown Your 56k comment is correct, but the point here is that he can't even to 28.8, which narrows the likely problem/solution. Nothing is gained by considering your point. D
From: Robert Baer on 27 Apr 2010 14:39 Martin Brown wrote: > Robert Baer wrote: >> Martin Brown wrote: >>> denali wrote: >>>> FYI, RE: JB's post.. leased line parameters are in no way applicable >>>> to switched services. Forget about 3002 channels, etc. >>>> >>>> Since you had better data service that has become degraded, something >>>> is clearly wrong somewhere. >>> >>> Not wrong. Different. He should force a V34+ connection and see if >>> that behaves any better - but he doesn't listen to advice. >>> >>> Most likely one of his neighbours has moved to ADSL and the engineers >>> have pinched his real copper circuit for that. Multiplexed local >>> lines do not carry 56k signals at all well. The older analogue >>> technology modems are a bit more robust in that environment. >>> >>> Regards, >>> Martin Brown >> Well,now if i KNEW how to force V34+ i would try. > > You should pay more attention to the postings in this thread and also > ask on comp.modems and/or us.telecom or whatever it is called. They will > know where you can dial into for a DIY line bandwidth test. Assuming > that end users are allowed to do such things in "the land of the free". > > You might find a prehistoric early 56k UK FAQ helpful in trying to > configure your modem to work retro style. > > http://www.pierrot.demon.co.uk/faq/dtm.faq > > (it is well out of date and UK based but still has good hints) > > Regards, > Martin Brown I have that UK reference and it is interesting and a bit informative. I have TerraTerm Pro but i cannot use it with my ISP to do any testing. If i ATDTetc in, that works and see the prompt for username but +++ does not escape to modem; if i am online like now, TerraTerm barfs. So _that_ type of testing is out unless there is another number or alternate to try. One of the suggested tests was with http://www.whichvoip.com/voip/speed_test/ppspeed.html and jitter was 610mSec, packet loss of 0%, MOS score (whatever that is) of 2.9, download speed 26.2K, upload speed of 21.5k and QOS at 92%. Measured loop current 35mA, different US Robotics modem acts the same.
From: Martin Brown on 27 Apr 2010 17:40 denali wrote: > On Apr 27, 12:08 am, Martin Brown <|||newspam...(a)nezumi.demon.co.uk> > wrote: >> denali wrote: >>> FYI, RE: JB's post.. leased line parameters are in no way applicable >>> to switched services. Forget about 3002 channels, etc. >>> Since you had better data service that has become degraded, something >>> is clearly wrong somewhere. >> Not wrong. Different. He should force a V34+ connection and see if that >> behaves any better - but he doesn't listen to advice. >> >> Most likely one of his neighbours has moved to ADSL and the engineers >> have pinched his real copper circuit for that. Multiplexed local lines >> do not carry 56k signals at all well. The older analogue technology >> modems are a bit more robust in that environment. >> >> Regards, >> Martin Brown > > Your 56k comment is correct, but the point here is that he can't even > to 28.8, which narrows the likely problem/solution. Nothing is gained > by considering your point. > > D The telco frees up a real copper circuit for a higher value customer, and puts the cheapskates with basic phone only onto shared multiplexed lines. That destroys 56k and derivatives functioning at anything like full speed. V34+ will work better if the problem is as I describe. Regards, Martin Brown
From: krw on 27 Apr 2010 19:01
On Tue, 27 Apr 2010 01:35:47 -0700, Robert Baer <robertbaer(a)localnet.com> wrote: >krw(a)att.bizzzzzzzzzzzz wrote: >> On Mon, 26 Apr 2010 09:14:37 -0700 (PDT), denali <007denali(a)comcast.net> >> wrote: >> >>> FYI, RE: JB's post.. leased line parameters are in no way applicable >>> to switched services. Forget about 3002 channels, etc. >>> >>> Since you had better data service that has become degraded, something >>> is clearly wrong somewhere. >> >> Something changed, certainly. Wrong? Unlikely. >> >>> There are some defects the average CO Tech probably will never find >>> without the help of a Data Tech. For example, A terminal multiplexer >>> sync option might be mis-optioned. In such a case, voice grade tests >>> can be in limits, but analog modem data rate will be hobbled. (Been >>> there, fixed that before). >> >> Could be, but they're not likely to spend any time on it since he is getting >> what he pays for. There is no incentive for them to spend money on the line. >> >> >> <...> > INCENTIVE????? > For Qwest, that DOES NOT exist, except to extract as much money as >possible from their captive customers. That's what I said. There is *no* incentive to help you get something that you're not paying them for. |