POTS line quality help
in [Design]
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From: Robert Baer on 26 Apr 2010 03:21 J B wrote: > You may be thinking of 3002 leased line conditioning C2 > For further info you can find a table describing it at: > http://www.sageinst.com/downloads/925an/vfmeas.pdf > > It has been a long time since I have had to think of those > conditioned lines for modems. > bye, > Jim > > > Robert Baer wrote: >> Once upon a time, a long time ago, there was only analog modems and >> nice paper manuals came with them. >> Some of those manuals, in the back discussed that for best use, one >> should order a specific quality of phone line and disclosed the BELLCO >> designation to use when ordering the line. >> As i remember it, that designation was something simple like (making >> this up) Z9. >> I think that the TekCom modem manual at that time was one that gave >> that info. >> Question: What is that designation? >> Thanks. Thanks; rather interesting and informative.
From: krw on 26 Apr 2010 18:14 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. <...>
From: Martin Brown on 27 Apr 2010 03:08 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
From: Robert Baer on 27 Apr 2010 04:35 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.
From: Robert Baer on 27 Apr 2010 04:36
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. |