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echo: aust_modem
to: Bill Grimsley
from: Warwick Empson
date: 1996-05-04 20:12:22
subject: Connection Problems

Hello Bill,
 
 
 WE> has??? The only difference I note when dialling with ATX=3 in place, is 
 WE> that the engaged signal will not cut off and I have to manually hang up.

 BG> I have just noted that the incorrect command syntax of ATX=3 will
 BG> actually set X=0, which in turn disables ALL service tone detection.

That is probably the reason I have to hang up manually, when getting an engaged
line?
 
 BG> Start your terminal app, and configure it so that you have CTS/RTS
 BG> hardware flow control enabled, XON/XOFF software flow control
 BG> disabled, lock your serial port rate to 38400 bps, and enable your
 BG> 16550 buffered UART if you have one.

My internal Sportster is configured as above, except that I had the DTE set at
 115,000 bps,( I have lowered it to 38400 as you suggest). I was of the 
opinion that the higher the rate the better??

  Next, edit your term's init$ to
 BG> read ATZ^M (where control-M is the carriage return character), then
 BG> enter the following string to your modem (once only, and exactly as
 BG> written)... 
 BG> AT &F &A3 &K3 X3 &W ^M
 BG> 3  3  3   3   3  3  {at}-Carriage return character (press Enter)
 BG> 3  3  3   3   3  {at}-Permanently write command to NVRAM
 BG> 3  3  3   3   {at}-Disable BUSY service tone detect  
 BG> 3  3  3   {at}-Enable V.42bis but disable MNP-5
 BG> 3  3  {at}-Enable full connect string results
 BG> 3  {at}-Reset factory default profile
 BG> {at}-Attention command

Yep, did that,and when I tried it out, it worked, but when I hung up, and
then fired up Telix again, and looked at ATI4, that pesky "X4" was there
again. On looking at the manual, I read on page 34, for "&W"
commands, that
&W0  modifies NVRAM 0 template
&W1  modifies NVRAM 1 template
I wonder, did you accidentally leave out either the 0 or 1 on &W  ???   
I then tried redialing, but my original problem of dropout on 2nd ring was
back.
 BG> Set the modem's DIP switches so that 3, 5, and 8 are ON, all others
 BG> OFF   
Being an internal, I don't have any??
 
 BG> An ATI4 issued whilst in terminal mode should return a display similar
 BG> to the following.  If not, recheck your steps thoroughly... 
 BG> ----------------------------------------------------------------
 BG> ati4
 BG> USRobotics Austel external Sportster 14400 Fax Settings...

 BG> B0  E1  F1  M1  Q0  V1  X3
 BG> BAUD=38400  PARITY=N  WORDLEN=8
 BG> DIAL=HUNT  ON HOOK

 BG> &A3  &B1  &C1  &D2  &G0  &H1  &I0  &K3
 BG> &M4  &N0  &P0  &R2  &S0  &T5  &Y1

 BG> S00=000  S01=000  S02=043  S03=013  S04=010  S05=008  S06=002
 BG> S07=060  S08=002  S09=006  S10=007  S11=070  S12=050  S13=000
 BG> S14=000  S15=000  S16=000  S17=000  S18=000  S19=000  S20=000
 BG> S21=010  S22=017  S23=019  S24=000  S25=005  S26=000  S27=000
 BG> S28=008  S29=020  S30=000  S31=000  S32=000  S33=000  S34=006
 BG> S35=000  S36=000  S37=000  S38=000  S39=000  S40=000  S41=000
 BG> S42=000  S43=000  S44=015  S45=000  S46=000  S47=000  S48=000
 BG> S49=000  S50=000  S51=000
 BG> ----------------------------------------------------------------

My settings on ati4 were mostly the same as yours above with the following
exceptions.
S10=014  S11=055  S34=000  S36=014  
 
 WE> When the line is free, the modem works flawlessly. However, I now seem to 
 WE> have a problem with Telix interpreting the time for download, whereby the 
 WE> original estimated time will be a ridiculuosly low 0.5 minutes (or so), but 
 WE> the actual time might be 5 or 8 minutes. Any bright ideas?

 BG> Not exactly sure what you mean here, but it could simply be that the
 BG> estimated file transfer times will be wildly inaccurate while the
 BG> modem's buffers are being filled with data. 

The above problem with transfer time seemed to start when I started using the
above "atx=3". The actual rate of transfer still shows as approx 3100-3200,
so that isn't affected. My biggest problem is that I know enough about 
computers, modems etc, to get myself into trouble :(((. I envy you guys who
have all the answers. Still, I suppose it isn't something one can learn
overnight?
Before I forget, I also tried using "atx=2". That made no difference from
using "atx=3"
Hope I'm not becoming a nuisance .
BFN.............Warwick.



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