Re: ppp, pmcia and isdn question

[urs roesch <urs@example.com>]

Uli,

usually you can treat a TA like a modem with the exception of the NEC ones[1]. If you look at the documentation of the NEC TA and go through the list of AT commands you'll find a command called $N that is for setting the data port. To be able to do PPP you have to send $N1=1 when initializing the TA. 

Here is my ppp.chat.it50dsu for your reference

TIMEOUT 10
ABORT "NO CARRIER"
ABORT BUSY
ABORT "NO DIALTONE"
ABORT ERROR
"" +++ATZ
OK "AT Q0 V1 X3 $N9=10 $N1=1 &D1 "
OK "ATDT <your number here>"
TIMEOUT 60
"CONNECT 64000" ""     


Hope that helps.

--urs


[1] Take with a grain of salt, I haven't tested them all.


Ulrike Schmidt [ulrike@example.com] wrote:
> I am trying to connect to my ISP from my notebook running debian potato with two methods: pcmcia-modem (USRobotics, Megahertz 33.6) and isdn (NEC Aterm IT55DSU). If possible I would like to be able to use both. 
> 
> I first tried to get the pcmcia-modem working. Cardinfo says "Serial or Modem", dev "ttyS2", but when I used pppconfig and had it autodetect the modem it did not find it, so entered ttyS2 by hand. I also used PAP, although I don't know whether this is correct. Anyway, somehow I cannot get a connection. I read something about pppd and debug, but "pppd debug" says "The remote system is required to authenticate itself but I couldn't find any suitable secret (password) for it to use to do so. (None of the available passwords would let it use an IP adress.)" I did not quite understand this message and I guess I also did not get the syntax right (just tried "pppd -debug" but it does not recognize the option). 
> 
> Anyway, I gave up on this one for the moment and tried my luck with isdn. pppconfig detects the ISDN adaptor, and when I run pon there seems to be some communication, lights blink, but after a while the connection terminates. I tried PAP and Chat and CHAP and everything is the same.
> 
> I got doubts that I can just pretend the ISDN adaptor is a modem, although I thought I remembered someone saying so on tlug, so I searched the archives, but got too many or not the right hits. In some ISDN docs I then saw that Terminal Adaptors are to be treated different from ISDN cards, e.g.: "However, isdn4linux can not make use of any devices connected via a serial or parallel interface (which are called 'terminal adaptors'), ..." and the HOWTO.isdnutils also spoke about cards, so I thought now I better ask first on this list:
> 
> If cardinfo detects the pcmcia-card as a modem, why doesn't pppconfig?
> Can I treat the ISDN adapter just like a modem without installing anything else?
> Should I use PAP, Chat or CHAP?
> How can I find out where the problem lies with failing connections? plog printed out a lot of strange strings will the lights were blinking but not much informative information about why the connection failed in the end.
> 
> Best, Uli
> 
> 
> 

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