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.\" Copyright (c) 1998, 2000 Hellmuth Michaelis. All rights reserved.
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.\"	$Id: isdndecode.8,v 1.9 2000/02/21 15:17:17 hm Exp $
.\"
.\"	last edit-date: [Mon Feb 21 16:15:09 2000]
.\"
.\" $FreeBSD$
.\"
.Dd February 21, 2000
.Dt ISDNDECODE 8
.Os
.Sh NAME
.Nm isdndecode
.Nd isdn4bsd ISDN protocol decode utility
.Sh SYNOPSIS
.Nm
.Op Fl a
.Op Fl b
.Op Fl d
.Op Fl f Ar filename
.Op Fl h
.Op Fl i
.Op Fl l
.Op Fl o
.Op Fl p Ar filename
.Op Fl u Ar number
.Op Fl x
.Op Fl B
.Op Fl P
.Op Fl R Ar unit
.Op Fl T Ar unit
.Sh DESCRIPTION
.Nm
is part of the isdn4bsd package and is used to provide the user with a 
detailed mnemonic display of the layers 1, 2 and 3 protocol activities on 
the D channel and hex dump of the B channel(s) activities.
.Pp
Together with two passive supported cards and an easy to build cable it can
also be used to monitor the complete traffic on a S0 bus providing S0 bus
analyzer features.
.Pp
The
.Nm
utility is only available for passive supported cards.
.Pp
The following options can be used:
.Bl -tag -width Ds
.It Fl a
Run
.Nm
in analyzer mode by using two passive cards and a custom cable which can
be build as described in the file
.Em cable.txt
in the isdn4bsd source distribution. One card acts as a receiver for the
transmitting direction on the S0 bus while the other card acts as a receiver
for the receiving direction on the S0 bus. Complete traffic monitoring is
possible using this setup.
.It Fl b
switch B channel tracing on (default off).
.It Fl d
switch D channel tracing off (default on).
.It Fl f
Use 
.Ar filename
as the name of a file into which to write tracing output (default filename is
isdndecode<n> where n is the number of the unit to decode).
.It Fl h
switch display of header off (default on).
.It Fl i
print layer 1 (I.430) INFO signals to monitor layer 1 activity (default off).
.It Fl l
switch displaying of Layer 2 (Q.921) frames off (default on).
.It Fl o
switch off writing decode output to a file (default on).
.It Fl p
Use 
.Ar filename
as the name of a file used for the -B and -P options (default filename
is isdntracebin<n> where n is the number of the unit to decode).
.It Fl u
Use 
.Ar number
as the unit number of the controller card to decode (default 0).
.It Fl x
Decode Layer 3 packets with an unknown protocol discriminator.
.It Fl B
Write undecoded binary decode data to a file for later or remote 
analyzing (default off).
.It Fl P
Read undecoded binary decode data from file instead from device (default off).
.It Fl R
Use
.Ar unit
as the receiving interface unit number in analyze mode.
.It Fl T
Use
.Ar unit
as the transmitting interface unit number in analyze mode.
.El
.Pp
When the USR1 signal is sent to a
.Nm
process, the currently used logfiles are reopened, so that logfile
rotation becomes possible.
.Pp
The decode output should be obvious. It is very handy to have the following
standard texts available when tracing ISDN protocols:
.Pp
.Bl -tag -width Ds -compact -offset indent
.It Ar I.430
ISDN BRI layer 1 protocol description.
.It Ar Q.921
ISDN D-channel layer 2 protocol description.
.It Ar Q.931
ISDN D-channel layer 3 protocol description.
.El
.Pp
.Sh FILES
.Bl -tag -width daddeldi -compact
.It Pa /dev/i4btrc<n>
The devicefile(s) used to get the decode messages for ISDN card unit <n>
out of the kernel.
.El
.Sh EXAMPLES
The command:
.Bd -literal -offset indent
isdndecode -f /var/tmp/isdn.decode
.Ed
.Pp
will start D channel tracing on passive controller 0 with all except B
channel tracing enabled and logs everything into the output file 
/var/tmp/isdn.decode.
.Sh SEE ALSO
.Xr isdnd 8
.Sh BUGS
Still one left.
.Sh STANDARDS
ITU Recommendations I.430, Q.920, Q.921, Q.930, Q.931
.Pp
ITU Recommendation Q.932 (03/93), Q.950 (03/93)
.Pp
ETSI Recommendation ETS 300 179 (10/92), ETS 300 180 (10/92)
.Pp
ETSI Recommendation ETS 300 181 (04/93), ETS 300 182 (04/93)
.Pp
ITU Recommendation X.208, X.209
.Sh AUTHORS
The
.Nm
utility and this manual page were written by 
.An Hellmuth Michaelis Aq hm@kts.org .