POTS line quality help
in [Design]
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From: Robert Baer on 9 May 2010 03:36 Martin Brown wrote: > Robert Baer wrote: >> Martin Brown wrote: > >>> Otherwise I suggest that instead of tinkering with individual S >>> registers where the smallest mistake will cause trouble read up on >>> the +MS: command in the manual and pray that your modem implements it. >>> >>> Looking at the above you probably want to throttle back the attempted >>> connect speed to 46666 and if it cannot maintain that the 45333. >>> There is no point allowing it to fall forward and then have to retrain. >>> >>> BTW That download bitrate is about right for a longish rural line. >>> Your upload speed is a bit on the slow side though. For uploading >>> material you might want to force a V34+ connection which will be faster. > >> I note the S33, S34 relate to V34+ but know nothing about symbol >> rates and 8S, 16S etc so have no clue as how to force V34+; all i know >> is that those registers are zero meaning none of that is disabled. >> ** > > Try the +MS: command > Twiddling individual registers will get you into trouble unless you know > exactly what you are doing (and it is clear you do not). > >> It is two blocks to the BIG box where all of the wiring goes >> to/from, and that box is where they added that "stinger". > > When you say that I imagine the police contraption used for deflating > stolen car tyres. But in this context I expect it is a Lucent/Ascend > extender product which ought to give reasonable bandwidth. > > http://www.domain-b.com/companies/companies_l/lucent/19990908stinger.html > >> After _numerous_ calls i was finally able to determine that yes, >> they screwed all dialup-only customers in ADC encoding and it is >> impossible to get them to "fix" it as all they care about is "giving >> me dial tone" which can translate to cruddiness that one would be >> lucky to get 9600 baud. > > They are only obliged to give you a service capable of voice grade > communications - that is what you are paying for. Real copper is > reserved now for profitable customers - as an advocate of free market > capitalism you ought to understand that you will be disadvantaged. > >> I would have to pay for a DSL line and i am damn sure to get all of >> the BS they "package" with it whether i use it or not (MSN "live", >> good only for Win7). >> So i would have to pay for all of the junk and not be able to get a >> discount for _just_ the bandwidth. > > In the UK you can choose your ADSL supplier and packages vary in both > content, amount of download per month, speed and price. eg > > http://www.money.co.uk/broadband/adsl-broadband.htm > > Even better deals available if you bundle your mobile phone, landline > and DSL service with one provider and pay monthly by direct debit. > > I am very surprised that it is not the same in the USA. Are you really > saying that your Telco has a monopoly over ADSL service provision? > > Even if they do there are mobile phone data dongles that for moving > modest amounts of data can be cost effective. > > Or are you saying that you cannot afford $10/month? > > Regards, > Martin Brown Co$t... Absolutely any service other than straight dial-up costs in the region of $30 or more: DSL add-on, cable; satellite costs $60 installation and $60/month and it is unreliable even in good weather; WiNet ("Clear") is $30/mo and up; neither WiFi nor WiNet works without a goodly outdoor antenna and distribution amp (even a cell phone does not work until one gets 200 feet or more away from house toward street). Hell even dial-up is in the $30/mo region! Aint no service in the $10/month region unless one uses tin cans and string (or lots of yelling).
From: Martin Brown on 9 May 2010 04:56 Robert Baer wrote: > Martin Brown wrote: >> Robert Baer wrote: >>> Martin Brown wrote: >> >>>> Otherwise I suggest that instead of tinkering with individual S >>>> registers where the smallest mistake will cause trouble read up on >>>> the +MS: command in the manual and pray that your modem implements it. >>>> >>>> Looking at the above you probably want to throttle back the >>>> attempted connect speed to 46666 and if it cannot maintain that the >>>> 45333. There is no point allowing it to fall forward and then have >>>> to retrain. >>>> >>>> BTW That download bitrate is about right for a longish rural line. >>>> Your upload speed is a bit on the slow side though. For uploading >>>> material you might want to force a V34+ connection which will be >>>> faster. >> >>> I note the S33, S34 relate to V34+ but know nothing about symbol >>> rates and 8S, 16S etc so have no clue as how to force V34+; all i >>> know is that those registers are zero meaning none of that is disabled. >>> ** >> >> Try the +MS: command >> Twiddling individual registers will get you into trouble unless you >> know exactly what you are doing (and it is clear you do not). >> >>> It is two blocks to the BIG box where all of the wiring goes >>> to/from, and that box is where they added that "stinger". >> >> When you say that I imagine the police contraption used for deflating >> stolen car tyres. But in this context I expect it is a Lucent/Ascend >> extender product which ought to give reasonable bandwidth. >> >> http://www.domain-b.com/companies/companies_l/lucent/19990908stinger.html >> >>> After _numerous_ calls i was finally able to determine that yes, >>> they screwed all dialup-only customers in ADC encoding and it is >>> impossible to get them to "fix" it as all they care about is "giving >>> me dial tone" which can translate to cruddiness that one would be >>> lucky to get 9600 baud. >> >> They are only obliged to give you a service capable of voice grade >> communications - that is what you are paying for. Real copper is >> reserved now for profitable customers - as an advocate of free market >> capitalism you ought to understand that you will be disadvantaged. >> >>> I would have to pay for a DSL line and i am damn sure to get all of >>> the BS they "package" with it whether i use it or not (MSN "live", >>> good only for Win7). >>> So i would have to pay for all of the junk and not be able to get a >>> discount for _just_ the bandwidth. >> >> In the UK you can choose your ADSL supplier and packages vary in both >> content, amount of download per month, speed and price. eg >> >> http://www.money.co.uk/broadband/adsl-broadband.htm >> >> Even better deals available if you bundle your mobile phone, landline >> and DSL service with one provider and pay monthly by direct debit. >> >> I am very surprised that it is not the same in the USA. Are you really >> saying that your Telco has a monopoly over ADSL service provision? >> >> Even if they do there are mobile phone data dongles that for moving >> modest amounts of data can be cost effective. >> >> Or are you saying that you cannot afford $10/month? >> >> Regards, >> Martin Brown > Here is some info: > * Modem: US Robotics 5686. > * Only "M" commands in CD manual: M0, M1, M2, M3 speaker control; &Mn > sets error control (ARQ). Pay careful attention the command if it exists is +MS:<parameters> It should be with the other "+" prefix commands. > * S91: ERROR (ie: not recognized). > * S32=96 or =64 or =32 all gave same thing, the VOIP test showed 12.9K > download, 13.0K upload and modem query I6 afterwards showed speed 14,400 > and V42BIS and icon indicated 115,200bps. > * S32=98 the VOIP test showed 11.1K download, 26.0K upload and modem > query I6 afterwards showed speed 28800/28800 and V42BIS and icon > indicated 28,800bps. > * S32=2 the VOIP test showed 42.6K download, 19.4K upload and modem > query I6 afterwards showed speed 48000/21600 as well as V.90 peak speed > 48000 and V42BIS and icon indicated 48,000bps. These may be about as good as you can get on the poxy voice line your telco has given you. 26k upload on a 28800/28800 connect (but poor download) and a 42.6k download with ~20k upload for V90. Only you can decide if the additional 25% upload speed gain is worth using when sending bulky material to the net. I would say probably not given the terrible download speed you seem to get with those settings. You probably want to figure out how to limit the initial connect speed to 42.6 or 44.0k to avoid having fallback negotiation delays every time. > Installed the software from the US Robotics CD and played around. > Wound up using modem init string Z S0=0 S32=2 +PIG=0 +PBI=2 and the > VOIP test showed 18.0K download, 19.4K upload and modem query I6 > afterwards showed speed 48000/21600 as well as V.90 peak speed 48000 and > V42BIS and icon indicated 48,000bps. This is clearly a big step backwards- use the previous settings instead! > > The wierd pig and pbi were from the software which one could tradeoff > upload speed for download speed; the graph showed one could get 56K > download but no way in hell. That is their implementation of access to the S91 xmit gain register and related settings. Manufacturers do vary - in some countries you are not allowed to alter the line gain at all. Regards, Martin Brown
From: Robert Baer on 10 May 2010 02:58
Martin Brown wrote: > Robert Baer wrote: >> Martin Brown wrote: >>> Robert Baer wrote: >>>> Martin Brown wrote: >>> >>>>> Otherwise I suggest that instead of tinkering with individual S >>>>> registers where the smallest mistake will cause trouble read up on >>>>> the +MS: command in the manual and pray that your modem implements it. >>>>> >>>>> Looking at the above you probably want to throttle back the >>>>> attempted connect speed to 46666 and if it cannot maintain that the >>>>> 45333. There is no point allowing it to fall forward and then have >>>>> to retrain. >>>>> >>>>> BTW That download bitrate is about right for a longish rural line. >>>>> Your upload speed is a bit on the slow side though. For uploading >>>>> material you might want to force a V34+ connection which will be >>>>> faster. >>> >>>> I note the S33, S34 relate to V34+ but know nothing about symbol >>>> rates and 8S, 16S etc so have no clue as how to force V34+; all i >>>> know is that those registers are zero meaning none of that is disabled. >>>> ** >>> >>> Try the +MS: command >>> Twiddling individual registers will get you into trouble unless you >>> know exactly what you are doing (and it is clear you do not). >>> >>>> It is two blocks to the BIG box where all of the wiring goes >>>> to/from, and that box is where they added that "stinger". >>> >>> When you say that I imagine the police contraption used for deflating >>> stolen car tyres. But in this context I expect it is a Lucent/Ascend >>> extender product which ought to give reasonable bandwidth. >>> >>> http://www.domain-b.com/companies/companies_l/lucent/19990908stinger.html >>> >>> >>>> After _numerous_ calls i was finally able to determine that yes, >>>> they screwed all dialup-only customers in ADC encoding and it is >>>> impossible to get them to "fix" it as all they care about is "giving >>>> me dial tone" which can translate to cruddiness that one would be >>>> lucky to get 9600 baud. >>> >>> They are only obliged to give you a service capable of voice grade >>> communications - that is what you are paying for. Real copper is >>> reserved now for profitable customers - as an advocate of free market >>> capitalism you ought to understand that you will be disadvantaged. >>> >>>> I would have to pay for a DSL line and i am damn sure to get all >>>> of the BS they "package" with it whether i use it or not (MSN >>>> "live", good only for Win7). >>>> So i would have to pay for all of the junk and not be able to get >>>> a discount for _just_ the bandwidth. >>> >>> In the UK you can choose your ADSL supplier and packages vary in both >>> content, amount of download per month, speed and price. eg >>> >>> http://www.money.co.uk/broadband/adsl-broadband.htm >>> >>> Even better deals available if you bundle your mobile phone, landline >>> and DSL service with one provider and pay monthly by direct debit. >>> >>> I am very surprised that it is not the same in the USA. Are you >>> really saying that your Telco has a monopoly over ADSL service >>> provision? >>> >>> Even if they do there are mobile phone data dongles that for moving >>> modest amounts of data can be cost effective. >>> >>> Or are you saying that you cannot afford $10/month? >>> >>> Regards, >>> Martin Brown >> Here is some info: >> * Modem: US Robotics 5686. >> * Only "M" commands in CD manual: M0, M1, M2, M3 speaker control; &Mn >> sets error control (ARQ). > > Pay careful attention the command if it exists is +MS:<parameters> > > It should be with the other "+" prefix commands. > >> * S91: ERROR (ie: not recognized). >> * S32=96 or =64 or =32 all gave same thing, the VOIP test showed >> 12.9K download, 13.0K upload and modem query I6 afterwards showed >> speed 14,400 and V42BIS and icon indicated 115,200bps. >> * S32=98 the VOIP test showed 11.1K download, 26.0K upload and modem >> query I6 afterwards showed speed 28800/28800 and V42BIS and icon >> indicated 28,800bps. >> * S32=2 the VOIP test showed 42.6K download, 19.4K upload and modem >> query I6 afterwards showed speed 48000/21600 as well as V.90 peak >> speed 48000 and V42BIS and icon indicated 48,000bps. > > These may be about as good as you can get on the poxy voice line your > telco has given you. 26k upload on a 28800/28800 connect (but poor > download) and a 42.6k download with ~20k upload for V90. Only you can > decide if the additional 25% upload speed gain is worth using when > sending bulky material to the net. I would say probably not given the > terrible download speed you seem to get with those settings. > > You probably want to figure out how to limit the initial connect speed > to 42.6 or 44.0k to avoid having fallback negotiation delays every time. > >> Installed the software from the US Robotics CD and played around. >> Wound up using modem init string Z S0=0 S32=2 +PIG=0 +PBI=2 and the >> VOIP test showed 18.0K download, 19.4K upload and modem query I6 >> afterwards showed speed 48000/21600 as well as V.90 peak speed 48000 >> and V42BIS and icon indicated 48,000bps. > > This is clearly a big step backwards- use the previous settings instead! >> >> The wierd pig and pbi were from the software which one could >> tradeoff upload speed for download speed; the graph showed one could >> get 56K download but no way in hell. > > That is their implementation of access to the S91 xmit gain register and > related settings. Manufacturers do vary - in some countries you are not > allowed to alter the line gain at all. > > Regards, > Martin Brown Here is a recap of what i have: DUN modem setup string: s0=0 s32=2 +PIG=0 +PBI=2 U.S. Robotics 56K FAX EXT Link Diagnostics... Chars sent 799104 Chars Received 7875685 Chars lost 0 Octets sent 424039 Octets Received 6317772 Blocks sent 19931 Blocks Received 51791 Blocks resent 81 Retrains Requested 0 Retrains Granted 1 Line Reversals 0 Blers 761 Link Timeouts 6 Link Naks 5 Data Compression V42BIS 2048/32 Equalization Long Fallback Enabled Protocol LAPM/SREJ Speed 49333/21600 V.90 Peak Speed 49333 Last Call 01:50:03 Disconnect Reason is DTR dropped OK U.S. Robotics 56K FAX EXT Link Diagnostics... Modulation V.90/V.34 Carrier Freq (Hz) None/1920 Symbol Rate 8000/3200 Trellis Code None/64S-4D Nonlinear Encoding None/ON Precoding OFF/ON Shaping OFF/ON Preemphasis Index 5/10 Recv/Xmit Level (-dBm) 23.1/8.6 Near Echo Loss (dB) 43.0 Far Echo Loss (dB) 0 Carrier Offset (Hz) 0 Round Trip Delay (msec) 13 Timing Offset (ppm) 2469 SNR (dB) 47.9 Speed Shifts Up/Down/Null 2/0/13 Status : uu,5,12N,12.1,-7,0N,000,49.8,-60.0,0 OK U.S. Robotics 56K FAX EXT Settings... B0 E0 F1 M1 Q0 V1 X4 Y0 BAUD=115200 PARITY=N WORDLEN=8 DIAL=TONE ON HOOK CID=0 &A3 &B1 &C1 &D2 &G0 &H1 &I0 &K1 &M4 &N0 &P1 &R2 &S0 &T5 &U0 &Y1 S00=000 S01=000 S02=043 S03=013 S04=010 S05=008 S06=004 S07=060 S08=002 S09=006 S10=014 S11=070 S12=050 S13=000 S15=000 S16=000 S18=000 S19=000 S21=010 S22=017 S23=019 S25=005 S27=000 S28=008 S29=020 S30=000 S31=128 S32=002 S33=000 S34=000 S35=000 S36=014 S38=000 S39=000 S40=001 S41=000 S42=010 LAST DIALED #: T5039804040 OK |