POTS line quality help
in [Design]
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From: Robert Baer on 1 May 2010 00:15 Robert Baer wrote: > denali wrote: >> On Apr 30, 12:28 pm, Robert Baer <robertb...(a)localnet.com> wrote: >>> JosephKK wrote: >>>> On Wed, 28 Apr 2010 16:45:04 -0700, Robert Baer >>>> <robertb...(a)localnet.com> >>>> wrote: >> (snip) >>> ** >>> Called "wonderful" "helpful" Qwest about connection problem. >>> The extensive phone line testing was done in Apr 2009 with complete >>> bill of health including almost no noise; that is when the tech said >>> that a stinger had (note tense) been installed. >>> The idiot at Qwest maintains there is no record of that, there is no >>> way to determine that, and that nobody there knows what i am talking >>> about (!!). >>> The very same idiot maintains that i can communicate at _any_ data >>> rate even above 1M (!!) and to call my ISP about the problem. >>> >> (snip) >> >> You're right, the person appears to be oblivious. There is a very >> simple way for that phone answerer to obtain all the details of the >> facility assigned to your phone line. It's called, appropriate >> enough, the Line Assignment record. >> >> I can't call them about this for you, because I am not your designated >> representative. If you have a way to conference me onto a call with >> them, however, I can talk with them. But it might cost you a beer at >> the nearest McMenamins. > I presume you reviewed the two ascii files attached elsewhere; i made > a third try with a differrnt setting S0=1, S32=2 and the modem indicated > speed 45333/26400 with protocol LAPM/SREJ (whatever that means). > So i went into dial-up networking and changed the initialization > string for that. > The little double-monitor icon now indicates 48K which is a decided > improvement. > Any way i can goose it more? I tried initialization string S0=1 S32=96 and connection was refused; setting back (no reboot) to S0=1 S32=2 gives connection and 48K rate.
From: Robert Baer on 1 May 2010 17:42 Robert Baer wrote: > Robert Baer wrote: >> denali wrote: >>> On Apr 30, 12:28 pm, Robert Baer <robertb...(a)localnet.com> wrote: >>>> JosephKK wrote: >>>>> On Wed, 28 Apr 2010 16:45:04 -0700, Robert Baer >>>>> <robertb...(a)localnet.com> >>>>> wrote: >>> (snip) >>>> ** >>>> Called "wonderful" "helpful" Qwest about connection problem. >>>> The extensive phone line testing was done in Apr 2009 with complete >>>> bill of health including almost no noise; that is when the tech said >>>> that a stinger had (note tense) been installed. >>>> The idiot at Qwest maintains there is no record of that, there is no >>>> way to determine that, and that nobody there knows what i am talking >>>> about (!!). >>>> The very same idiot maintains that i can communicate at _any_ data >>>> rate even above 1M (!!) and to call my ISP about the problem. >>>> >>> (snip) >>> >>> You're right, the person appears to be oblivious. There is a very >>> simple way for that phone answerer to obtain all the details of the >>> facility assigned to your phone line. It's called, appropriate >>> enough, the Line Assignment record. >>> >>> I can't call them about this for you, because I am not your designated >>> representative. If you have a way to conference me onto a call with >>> them, however, I can talk with them. But it might cost you a beer at >>> the nearest McMenamins. >> I presume you reviewed the two ascii files attached elsewhere; i >> made a third try with a differrnt setting S0=1, S32=2 and the modem >> indicated speed 45333/26400 with protocol LAPM/SREJ (whatever that >> means). >> So i went into dial-up networking and changed the initialization >> string for that. >> The little double-monitor icon now indicates 48K which is a decided >> improvement. >> Any way i can goose it more? > I tried initialization string S0=1 S32=96 and connection was refused; > setting back (no reboot) to S0=1 S32=2 gives connection and 48K rate. To see if i could control the data rate, i tried "z s0=1 s32=2 &n38" for initialization string (force 56K) and nogo; then "z s0=1 s32=2 &n36" and got 48K (supposed to force 53.3K), then "z s0=1 s32=2 &n17" and still got 48K (supposed to force 28K). So i dropped the &n and am using "z s0=1 s32=2" for now.
From: Robert Baer on 2 May 2010 23:13 Robert Baer wrote: > Robert Baer wrote: >> Robert Baer wrote: >>> denali wrote: >>>> On Apr 30, 12:28 pm, Robert Baer <robertb...(a)localnet.com> wrote: >>>>> JosephKK wrote: >>>>>> On Wed, 28 Apr 2010 16:45:04 -0700, Robert Baer >>>>>> <robertb...(a)localnet.com> >>>>>> wrote: >>>> (snip) >>>>> ** >>>>> Called "wonderful" "helpful" Qwest about connection problem. >>>>> The extensive phone line testing was done in Apr 2009 with complete >>>>> bill of health including almost no noise; that is when the tech said >>>>> that a stinger had (note tense) been installed. >>>>> The idiot at Qwest maintains there is no record of that, there >>>>> is no >>>>> way to determine that, and that nobody there knows what i am talking >>>>> about (!!). >>>>> The very same idiot maintains that i can communicate at _any_ data >>>>> rate even above 1M (!!) and to call my ISP about the problem. >>>>> >>>> (snip) >>>> >>>> You're right, the person appears to be oblivious. There is a very >>>> simple way for that phone answerer to obtain all the details of the >>>> facility assigned to your phone line. It's called, appropriate >>>> enough, the Line Assignment record. >>>> >>>> I can't call them about this for you, because I am not your designated >>>> representative. If you have a way to conference me onto a call with >>>> them, however, I can talk with them. But it might cost you a beer at >>>> the nearest McMenamins. >>> I presume you reviewed the two ascii files attached elsewhere; i >>> made a third try with a differrnt setting S0=1, S32=2 and the modem >>> indicated speed 45333/26400 with protocol LAPM/SREJ (whatever that >>> means). >>> So i went into dial-up networking and changed the initialization >>> string for that. >>> The little double-monitor icon now indicates 48K which is a decided >>> improvement. >>> Any way i can goose it more? >> I tried initialization string S0=1 S32=96 and connection was >> refused; setting back (no reboot) to S0=1 S32=2 gives connection and >> 48K rate. > To see if i could control the data rate, i tried "z s0=1 s32=2 &n38" > for initialization string (force 56K) and nogo; then "z s0=1 s32=2 &n36" > and got 48K (supposed to force 53.3K), then "z s0=1 s32=2 &n17" and > still got 48K (supposed to force 28K). > So i dropped the &n and am using "z s0=1 s32=2" for now. Do not understand the modem response speed 45333/26400 but discovered that download rate can be extremely slow IF IT EXISTS AT ALL, so i reverted to the standby "S0=0 S23=98" even tho that gives me 28.8K at best; it works in both directions. Suggestions for consistent 48K both directions?
From: Martin Brown on 3 May 2010 04:36 Robert Baer wrote: > Robert Baer wrote: >> I presume you reviewed the two ascii files attached elsewhere; i >> made a third try with a differrnt setting S0=1, S32=2 and the modem >> indicated speed 45333/26400 with protocol LAPM/SREJ (whatever that >> means). >> So i went into dial-up networking and changed the initialization >> string for that. >> The little double-monitor icon now indicates 48K which is a decided >> improvement. >> Any way i can goose it more? > I tried initialization string S0=1 S32=96 and connection was refused; > setting back (no reboot) to S0=1 S32=2 gives connection and 48K rate. Changing the xon character to 96 = 0x60 = ' is unlikely to be helpful. Where did you get the idea that this would be sensible? Default is S32=17 and it would only be relevant if you were on a poxy three wire serial link without hardware handshaking. This is extremely unlikely for an internal modem. Typically they have a much larger FIFO than standard serial port chipsets and fullspeed hardware handshaking. I strongly suggest that your problems here are largely self inflicted. Do AT&V0 and capture the result it displays. Posting that here will give us a sporting chance of undoing the mess you have got yourself into. Your best bet now is to reset the modem to its factory defaults (usually two variants one is robust and the other tries to be go-faster). Try each one of these in turn and you might actually get somewhere useful. AT&F AT&F0 AT&F1 Several of the other S registers you have meddled with are either reserved or undocumented or typos in your report of what you did. When you get it right store the best profile with AT&W0 Then initialise your modem with ATZ0 Regards, Martin Brown
From: Robert Baer on 3 May 2010 19:12
Martin Brown wrote: > Robert Baer wrote: >> Robert Baer wrote: >>> I presume you reviewed the two ascii files attached elsewhere; i >>> made a third try with a differrnt setting S0=1, S32=2 and the modem >>> indicated speed 45333/26400 with protocol LAPM/SREJ (whatever that >>> means). >>> So i went into dial-up networking and changed the initialization >>> string for that. >>> The little double-monitor icon now indicates 48K which is a decided >>> improvement. >>> Any way i can goose it more? >> I tried initialization string S0=1 S32=96 and connection was >> refused; setting back (no reboot) to S0=1 S32=2 gives connection and >> 48K rate. > > Changing the xon character to 96 = 0x60 = ' is unlikely to be helpful. > Where did you get the idea that this would be sensible? > > Default is S32=17 and it would only be relevant if you were on a poxy > three wire serial link without hardware handshaking. This is extremely > unlikely for an internal modem. Typically they have a much larger FIFO > than standard serial port chipsets and fullspeed hardware handshaking. > > I strongly suggest that your problems here are largely self inflicted. > > Do AT&V0 and capture the result it displays. Posting that here will give > us a sporting chance of undoing the mess you have got yourself into. > > Your best bet now is to reset the modem to its factory defaults (usually > two variants one is robust and the other tries to be go-faster). Try > each one of these in turn and you might actually get somewhere useful. > > AT&F > AT&F0 > AT&F1 > > Several of the other S registers you have meddled with are either > reserved or undocumented or typos in your report of what you did. > > When you get it right store the best profile with AT&W0 > Then initialise your modem with ATZ0 > > Regards, > Martin Brown All of the following commands result in ERROR : AT&V0 , AT&F , AT&F0 and AT&F1. I did not change any character, XON or otherwise. S32=17 would disable V.34+ (value 16) and enable v.8 indicate (value 1) and certainly would not enable v.8 mode (value 2). I have an external modem; refuse to use an internal of any type as i can SEE the lights on an external modem and have a fair idea as to which way data is traveling (and how much). |