POTS line quality help
in [Design]
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From: Robert Baer on 4 May 2010 23:56 Martin Brown wrote: > Robert Baer wrote: >> 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. > > Try AT&V or ATI4 then. Something is very fishy here... > > You should be able to make the modem tell you what its settings are. > >> 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). > > Where did you get this information? > Most of the rest of the world uses different numbered S registers eg. > > http://www.arcelect.com/MIU96-144_%20AT_Command_Set_and_S-Registers_0049-0002-005A.pdf > > > S32 is the Xon character (changing it not implemented in some modems). > I was also suspicious of your &N17 but put it down to careless typos. > Something which incidentally does not bode well for setting S registers. > >> 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). > > You are completely barking. Have you even got a decent FIFO buffered > 16550 type serial card in this derelict PC ? > > A PC of the implied vintage to be running Win98 basic serial ports > cannot keep up with the modem adequately at 56k speeds without having a > FIFO to absorb the slack. Dropped characters force retransmits and slows > things down. If you use an internal modem the FIFO is much bigger. > > Regards, > Martin Brown AND..command codes, S-register info, etc are all on the CD that came with the modem; date code seems to be 08/06/2004. I will stick with the codes as shown via the CD and via the modem for sanity.
From: Martin Brown on 5 May 2010 04:16 Robert Baer wrote: > The FIFO *is* a decent FIFO buffered 16550 type "serial card" emulated > in the PCs ASIC; ASUS M2N-MX SE Plus clock 2700Mhz. > Your "S" register descriptions are cattywhumpus with regard to > Rockwell which is one of the standards - that BTW follows Hayes, another > standard. No. I am afraid it is your modem that it out of step with the ROW. > AFAIK US Robotics used a Rockwell chip; cannot tear into it right > now(!!). > > > Copy and paste of manual session; note S register info *directly* from > modem: > ATE1 > OK > ATI4 > U.S. Robotics 56K FAX EXT Settings... > > B0 E1 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 &P0 &R2 &S0 &T5 &U0 &Y1 > > S00=001 S01=000 S02=043 S03=013 S04=010 S05=008 S06=002 > 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=000 > > LAST DIALED #: T9712310633 > > OK > ATI11 > U.S. Robotics 56K FAX EXT Link Diagnostics... > > > Modulation V.90 > Carrier Freq (Hz) None/1920 > Symbol Rate 8000/3200 > Trellis Code None/64S-4D > Nonlinear Encoding None/ON > Precoding None/ON > Shaping ON/ON > Preemphasis (-dB) 5/10 > Recv/Xmit Level (-dBm) 26/16 > Near Echo Loss (dB) 5 > Far Echo Loss (dB) 0 > Carrier Offset (Hz) NONE > Round Trip Delay (msec) 42 > Timing Offset (ppm) 2417 > SNR (dB) 46.0 > Speed Shifts Up/Down 4/5 > Status : uu,5,12N,12.2,-7,0N,0,49.7,15.9 > OK > ATI6 > U.S. Robotics 56K FAX EXT Link Diagnostics... > > Chars sent 2397433 Chars Received 52846317 > Chars lost 0 > Octets sent 1408747 Octets Received 51902644 > Blocks sent 79234 Blocks Received 408326 > Blocks resent 31 > > Retrains Requested 0 Retrains Granted 0 > Line Reversals 0 Blers 2894 > Link Timeouts 0 Link Naks 11 > > Data Compression V42BIS 2048/32 > Equalization Long > Fallback Enabled > Protocol LAPM/SREJ > Speed 45333/24000 > V.90 Peak Speed 48000 > Last Call 03:29:22 > > Disconnect Reason is DTR dropped > > OK > ATS$ > HELP, S Register Functions (CTRL-S to Stop, CTRL-C to Cancel) > > S0 Ring to Answer ON S28 V32 Handshake Time (1/10sec) > S1 Counts # of Rings S29 V.21 answer mode fallback timer > S2 Escape Code Char S30 Reserved > S3 Carriage Return Char S31 Reserved > S4 Line Feed Char S32 Connection bit mapped > operations. > S5 Backspace Char 1 = V.8 Call Indicate enable > S6 Wait Time/Dial Tone (sec) 2 = Enable V.8 mode > S7 Wait Time/Carrier (sec) 4 = Reserved > S8 Comma Time (sec) 8 = Disable V.34 modulation > S9 Carrier Detect Time (1/10sec) 16 = Disable V.34+ modulation > S10 Carrier Loss Time (1/10sec) 32 = Disable x2 modulation > S11 Dial Tone Spacing (msec) 64 = Disable V.90 modulation > S12 Escape Code Time (1/50sec) 128 = Reserved > S13 Bit Mapped S33 V.34 & V.34+ Connection setup > 1 = Reset ON DTR Loss bit mapped control flags. > 2 = Reduced Non-ARQ TX Buffer 1 = Disable 2400 Symbol rate > 4 = Set DEL=Backspace 2 = Disable 2743 Symbol rate > 8 = Do DS0 ON DTR 4 = Disable 2800 Symbol rate > 16 = Do DS0 ON Reset 8 = Disable 3000 Symbol rate > Strike a key when ready . . . > 32 = Reserved 16 = Disable 3200 Symbol rate > 64 = Disable Quick Retrains 32 = Disable 3429 Symbol rate > 128 = Escape Code Hang Up 64 = Reserved > S14 Reserved 128 = Disable Shaping > S15 Bit Mapped S34 V.34 & V.34+ Connection setup > 1 = MNP/V.42 Disabled in V.22 bit mapped control flags. > 2 = MNP/V.42 Disabled in V.22bis 1 = Disable 8S-2D trellis > encoding > 4 = MNP/V.42 Disabled in V.32 2 = Disable 16S-4D trellis > encoding > > 8 = Disable MNP Handshake 4 = Disable 32S-2D trellis > encoding > > 16 = Disable MNP Level 4 8 = Disable 64S-4D trellis > encoding > > 32 = Disable MNP Level 3 16 = Disable Non linear coding > 64 = Unusual MNP-Incompatibility 32 = Disable TX level deviation > 128 = Disable V.42 64 = Disable Pre-emphasis > 136 = Disable V.42 Detect Phase 128 = Disable Pre-coding > S16 Test Modes S35 Reserved > 1 = Reserved S36 Reserved > 2 = Dial Test S37 Reserved > 4 = Reserved S38 Disconnect Wait Time (sec) > 8 = Reserved S39 Reserved > Strike a key when ready . . . > 16 = Reserved S40 Reserved > 32 = Reserved S41 Distinctive Ring options > 64 = Reserved 1 = Distinctive Ring Enabled > 128 = Reserved 2 = Reserved > S17 Reserved 4 = Reserved > S18 &Tn Test Timeout (sec) 8 = Reserved > S19 Inactivity Timeout (min) 16 = Reserved > S20 Reserved 32 = Reserved > S21 Break Length (1/100sec) 64 = Reserved > S22 Xon Char 128 = Reserved > S23 Xoff Char S42 Reserved > S24 Reserved > S25 DTR Recognition Time (1/100sec) > S26 Reserved > S27 Bit Mapped > 1 = V21 Mode > 2 = Disable TCM > 4 = Disable V32 > 8 = Disable 2100hz > Strike a key when ready . . . > 16 = Enable V23 Fallback > 32 = Disable V32bis > 64 = Reserved > 128 = Software Compatibility Mode > > OK How curious. Difficult to argue with that as the firmware output but I am fairly convinced that something is odd here. If S32 really is according to your documentation then values 32, 64 and 96 are worth experimenting with to see if you can force a non-V90 connection. See for example the manual for another Rockwell chipset modem by Zoom which agrees with the S register mapping I expect. http://www.zoom.com/documentation/dial_up/1048r4.pdf I have never before seen a modem where &N was a valid command either. What model number and brand of modem is it? If they have not masked it out you might be able to improve upstream rates slightly by adjusting undocumented register S91 gain adjustment. 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. Regards, Martin Brown
From: Robert Baer on 7 May 2010 04:21 Martin Brown wrote: > Robert Baer wrote: > >> The FIFO *is* a decent FIFO buffered 16550 type "serial card" >> emulated in the PCs ASIC; ASUS M2N-MX SE Plus clock 2700Mhz. >> Your "S" register descriptions are cattywhumpus with regard to >> Rockwell which is one of the standards - that BTW follows Hayes, >> another standard. > > No. I am afraid it is your modem that it out of step with the ROW. > >> AFAIK US Robotics used a Rockwell chip; cannot tear into it right >> now(!!). >> >> >> Copy and paste of manual session; note S register info *directly* >> from modem: >> ATE1 >> OK >> ATI4 >> U.S. Robotics 56K FAX EXT Settings... >> >> B0 E1 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 &P0 &R2 &S0 &T5 &U0 &Y1 >> >> S00=001 S01=000 S02=043 S03=013 S04=010 S05=008 S06=002 >> 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=000 >> >> LAST DIALED #: T9712310633 >> >> OK >> ATI11 >> U.S. Robotics 56K FAX EXT Link Diagnostics... >> >> >> Modulation V.90 >> Carrier Freq (Hz) None/1920 >> Symbol Rate 8000/3200 >> Trellis Code None/64S-4D >> Nonlinear Encoding None/ON >> Precoding None/ON >> Shaping ON/ON >> Preemphasis (-dB) 5/10 >> Recv/Xmit Level (-dBm) 26/16 >> Near Echo Loss (dB) 5 >> Far Echo Loss (dB) 0 >> Carrier Offset (Hz) NONE >> Round Trip Delay (msec) 42 >> Timing Offset (ppm) 2417 >> SNR (dB) 46.0 >> Speed Shifts Up/Down 4/5 >> Status : uu,5,12N,12.2,-7,0N,0,49.7,15.9 >> OK >> ATI6 >> U.S. Robotics 56K FAX EXT Link Diagnostics... >> >> Chars sent 2397433 Chars Received 52846317 >> Chars lost 0 >> Octets sent 1408747 Octets Received 51902644 >> Blocks sent 79234 Blocks Received 408326 >> Blocks resent 31 >> >> Retrains Requested 0 Retrains Granted 0 >> Line Reversals 0 Blers 2894 >> Link Timeouts 0 Link Naks 11 >> >> Data Compression V42BIS 2048/32 >> Equalization Long >> Fallback Enabled >> Protocol LAPM/SREJ >> Speed 45333/24000 >> V.90 Peak Speed 48000 >> Last Call 03:29:22 >> >> Disconnect Reason is DTR dropped >> >> OK >> ATS$ >> HELP, S Register Functions (CTRL-S to Stop, CTRL-C to Cancel) >> >> S0 Ring to Answer ON S28 V32 Handshake Time (1/10sec) >> S1 Counts # of Rings S29 V.21 answer mode fallback >> timer >> S2 Escape Code Char S30 Reserved >> S3 Carriage Return Char S31 Reserved >> S4 Line Feed Char S32 Connection bit mapped >> operations. >> S5 Backspace Char 1 = V.8 Call Indicate enable >> S6 Wait Time/Dial Tone (sec) 2 = Enable V.8 mode >> S7 Wait Time/Carrier (sec) 4 = Reserved >> S8 Comma Time (sec) 8 = Disable V.34 modulation >> S9 Carrier Detect Time (1/10sec) 16 = Disable V.34+ modulation >> S10 Carrier Loss Time (1/10sec) 32 = Disable x2 modulation >> S11 Dial Tone Spacing (msec) 64 = Disable V.90 modulation >> S12 Escape Code Time (1/50sec) 128 = Reserved >> S13 Bit Mapped S33 V.34 & V.34+ Connection setup >> 1 = Reset ON DTR Loss bit mapped control flags. >> 2 = Reduced Non-ARQ TX Buffer 1 = Disable 2400 Symbol rate >> 4 = Set DEL=Backspace 2 = Disable 2743 Symbol rate >> 8 = Do DS0 ON DTR 4 = Disable 2800 Symbol rate >> 16 = Do DS0 ON Reset 8 = Disable 3000 Symbol rate >> Strike a key when ready . . . >> 32 = Reserved 16 = Disable 3200 Symbol rate >> 64 = Disable Quick Retrains 32 = Disable 3429 Symbol rate >> 128 = Escape Code Hang Up 64 = Reserved >> S14 Reserved 128 = Disable Shaping >> S15 Bit Mapped S34 V.34 & V.34+ Connection setup >> 1 = MNP/V.42 Disabled in V.22 bit mapped control flags. >> 2 = MNP/V.42 Disabled in V.22bis 1 = Disable 8S-2D trellis >> encoding >> 4 = MNP/V.42 Disabled in V.32 2 = Disable 16S-4D >> trellis encoding >> >> 8 = Disable MNP Handshake 4 = Disable 32S-2D >> trellis encoding >> >> 16 = Disable MNP Level 4 8 = Disable 64S-4D >> trellis encoding >> >> 32 = Disable MNP Level 3 16 = Disable Non linear >> coding >> 64 = Unusual MNP-Incompatibility 32 = Disable TX level >> deviation >> 128 = Disable V.42 64 = Disable Pre-emphasis >> 136 = Disable V.42 Detect Phase 128 = Disable Pre-coding >> S16 Test Modes S35 Reserved >> 1 = Reserved S36 Reserved >> 2 = Dial Test S37 Reserved >> 4 = Reserved S38 Disconnect Wait Time (sec) >> 8 = Reserved S39 Reserved >> Strike a key when ready . . . >> 16 = Reserved S40 Reserved >> 32 = Reserved S41 Distinctive Ring options >> 64 = Reserved 1 = Distinctive Ring Enabled >> 128 = Reserved 2 = Reserved >> S17 Reserved 4 = Reserved >> S18 &Tn Test Timeout (sec) 8 = Reserved >> S19 Inactivity Timeout (min) 16 = Reserved >> S20 Reserved 32 = Reserved >> S21 Break Length (1/100sec) 64 = Reserved >> S22 Xon Char 128 = Reserved >> S23 Xoff Char S42 Reserved >> S24 Reserved >> S25 DTR Recognition Time (1/100sec) >> S26 Reserved >> S27 Bit Mapped >> 1 = V21 Mode >> 2 = Disable TCM >> 4 = Disable V32 >> 8 = Disable 2100hz >> Strike a key when ready . . . >> 16 = Enable V23 Fallback >> 32 = Disable V32bis >> 64 = Reserved >> 128 = Software Compatibility Mode >> >> OK > > How curious. Difficult to argue with that as the firmware output but I > am fairly convinced that something is odd here. > > If S32 really is according to your documentation then values 32, 64 and > 96 are worth experimenting with to see if you can force a non-V90 > connection. > > See for example the manual for another Rockwell chipset modem by Zoom > which agrees with the S register mapping I expect. > > http://www.zoom.com/documentation/dial_up/1048r4.pdf > > I have never before seen a modem where &N was a valid command either. > What model number and brand of modem is it? > > If they have not masked it out you might be able to improve upstream > rates slightly by adjusting undocumented register S91 gain adjustment. > > 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. > > Regards, > Martin Brown 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. ** 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". 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. 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.
From: Martin Brown on 7 May 2010 09:25 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
From: Robert Baer on 9 May 2010 03:27
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). * 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. 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. 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. |