Re: PPP
From: David Wilson Clarke (pinggetridofthisbituino_at_operamail.com)
Date: 07/20/05
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Date: Wed, 20 Jul 2005 08:52:48 GMT
Moe Trin wrote:
> In the Usenet newsgroup alt.os.linux.suse, in article
> <rs20r2-s4i.ln1@pinguino.site>, David Wilson Clarke wrote:
>
>>I've just looked at the config sent to my modem, which is this:
>>
>>'AT Q0 V1 E1 S0=0 &C1 &D2 +FCLASS=0'
>
> This assumes that the modem is somehow initialized - possibly by the
> power on reset. You really should have a proper init string - as
> mentioned upthread, AT&F1 for USRs, AT&F0 for just about everyone
> else. ATZ is OK if you have programmed the NVRAM - if not, it's
> risky.
I would agree with you. In the programs I write for modems (and TAs) I
always start with the appropriate &F. As an asside &F on it's own
works on many modems, but obviously check first.
> Actually, that command would barf on my USR, because the +FCLASS=0
> is not a valid command for it. The same is true for my older
> Rockwell. I don't run a dialin service, so S0 is always set to zero
> (the default). The five other commands are also the default setting
> when the modems are initialized with AT&Fn.
I don't know whether differend initialisation strings are set,
depending upon the modem type. I know there are quite a few websites
which give lists of 'the correct initialisation string' for different
modems. I always have to plough through the manuals, as we usually
use modems (and TAs) in a non standard way. It's suprising how
different the AT command set is, for different modems. The common
command set is surprisingly small.
>
>>So 'grep tty /var/log/boot.msg' works.
>
> Here, yes, but I can't remember if I had to kick the security
> program between the legs to allow that.
I won't ask.
>>> Only 32 are new or changed in the last six months (the grep is
>>> looking at the timestamp in a recent directory listing from
>>> sunsite).
>>
>>>From the serial HOWTO, these are the changes for the last year:
>
> The rate of update has decreased dramatically over the past year or
> so. It used to be that I would ftp into ibiblio.org daily, change to
> the /pub/linux/docs/HOWTO/ directory, and give the command 'ls
> -lrt'. That server is one of a few that accepts such UNIX commands,
> and would give a directory listing sorted by date/time, oldest at
> the bottom. (The normal FTP command 'dir' is normally an alias for
> 'ls -Al'.) This
> allowed me to see the newest files right away. About a year or so
> ago, it was normal to see a quarter of all HOWTOs with a file date
> less than six months old. As soon as I downloaded the "new" files
> into a quarantine area, I'd run a 'diff' between my current copy and
> the new one - to see what has changed. As the 473 current HOWTOs
> total about 3.95 million words (about 12,000 pages of text), it's
> virtually impossible to read each document in a timely manner.
I'm currently re-reading the modem HOWTO, as it's a couple of years
since I last read it.
Re-reading the PCMCIA HOWTO has already helped me solve a problem I
was having with a PCMCIA serial adaptor.
>>v0.33 Aug. 2004: Modems use telco power, Some external serial modems
>>need Windows ?? Again: new gromitkc url
>
> That 'winmodem' web page from Rob Clark used to be a fantastic
> asset. To bad it's not being maintained. I had six entries in there
> under a different mail address.
I have always avoided Winmodems, one, because I always have a few
external ones floating about, and two, because they seem more trouble
than they are worth.
--
Dave Clarke
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