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<H2><A NAME="Grundlagen"></A> <A NAME="s2">2.</A> <A HREF="EN-i4l.html#toc2">Basics</A> </H2>
<P>I know a little bit about Linux. Maybe I can already connect to the
Internet with my modem.</P>
<P>Now I have ISDN - and I can't get anywhere at all. Why?</P>
<H2><A NAME="ModemNetzwerk"></A> <A NAME="ss2.1">2.1</A> <A HREF="EN-i4l.html#toc2.1">ISDN4Linux: modem or network?</A>
</H2>
<P>Forget everything that you know about modems.</P>
<P>ISDN is completely different.</P>
<P>
<OL>
<LI> There are no clicks or whistles.</LI>
<LI> There are no blinking lights.</LI>
<LI> The connections are made so quickly, that it's possble
to spend your entire paycheck within a matter of hours.</LI>
<LI> It's more fun. </LI>
</OL>
</P>
<P>The concepts are different:
<OL>
<LI> the methods of hardware connection</LI>
<LI> the methods of use</LI>
<LI> the methods of control possibilities</LI>
<LI> the methods of configuration</LI>
</OL>
</P>
<P>Under ISDN4Linux, the ISDN card is treated as a network card, only with
special characteristics.</P>
<H2><A NAME="ss2.2">2.2</A> <A HREF="EN-i4l.html#toc2.2">Overview of features</A>
</H2>
<P>
<UL>
<LI> Quick ISDN connections</LI>
<LI> Full integration as network</LI>
<LI> Client and Server</LI>
<LI> syncPPP</LI>
<LI> Modem emulation (AT command set)</LI>
<LI> Dial-On-Demand (DoD)</LI>
<LI> Full overview and control</LI>
<LI> Callback</LI>
<LI> Channel bundling</LI>
</UL>
</P>
<H2><A NAME="ss2.3">2.3</A> <A HREF="EN-i4l.html#toc2.3">Overview of missing features</A>
</H2>
<P>
<UL>
<LI> Serial connections (e.g. Fax)</LI>
<LI> CAPI interface (e.g. network)</LI>
<LI> Uniform environment...</LI>
<LI> PmX cards</LI>
</UL>
</P>
<H2><A NAME="ss2.4">2.4</A> <A HREF="EN-i4l.html#toc2.4">Overview of the tools</A>
</H2>
<P>
<DL>
<DT><B>isdnlog</B><DD><P>isdnlog <EM>listens</EM> in the background to the S0 bus and logs
incoming and outgoing connections for later analysis (including cost
control) and diagnosis.</P>
<DT><B>isdnctrl</B><DD><P>Sets important parameters specific to I4L (e.g. telephone numbers).</P>
<DT><B>HiSax</B><DD><P>The driver (as module or compiled into the kernel) for almost all passive
ISDN cards.</P>
<DT><B>hisaxctrl</B><DD><P>Controls the HiSax driver.</P>
<DT><B>ipppd</B><DD><P>The PPP daemon for ISDN (syncPPP).</P>
<DT><B>messages</B><DD><P>ISDN activity is logged in <CODE>/var/log/messages</CODE> (or via Syslog) -
important for diagnosing problems!</P>
<DT><B>ttyI</B><DD><P>Using the terminal devices <CODE>/dev/ttyI0</CODE> to
<CODE>/dev/ttyI64</CODE> <EM>normal</EM> terminal programs can access ISDN -
but not analog access!</P>
<DT><B>vbox</B><DD><P>The ISDN answering machine.</P>
</DL>
</P>
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