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isdndecode(8)

NAME

     isdndecode -- isdn4bsd ISDN protocol decode utility


SYNOPSIS

     isdndecode [-a] [-b] [-d] [-f filename] [-h] [-i] [-l] [-o] [-p filename]
		[-u number] [-x] [-B] [-P] [-R unit] [-T unit]


DESCRIPTION

     The isdndecode utility 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.

     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.

     The isdndecode utility is only available for passive supported cards.

     The following options can be used:

     -a      Run isdndecode in analyzer mode by using two passive cards and a
	     custom cable which can be build as described in the file
	     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 set-
	     up.

     -b      switch B channel tracing on (default off).

     -d      switch D channel tracing off (default on).

     -f      Use 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).

     -h      switch display of header off (default on).

     -i      print layer 1 (I.430) INFO signals to monitor layer 1 activity
	     (default off).

     -l      switch displaying of Layer 2 (Q.921) frames off (default on).

     -o      switch off writing decode output to a file (default on).

     -p      Use 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).

     -u      Use number as the unit number of the controller card to decode
	     (default 0).

     -x      Decode Layer 3 packets with an unknown protocol discriminator.

     -B      Write undecoded binary decode data to a file for later or remote
	     analyzing (default off).

     When the USR1 signal is sent to a isdndecode process, the currently used
     logfiles are reopened, so that logfile rotation becomes possible.

     The decode output should be obvious.  It is very handy to have the fol-
     lowing standard texts available when tracing ISDN protocols:

	   I.430   ISDN BRI layer 1 protocol description.
	   Q.921   ISDN D-channel layer 2 protocol description.
	   Q.931   ISDN D-channel layer 3 protocol description.


FILES

     /dev/i4btrc<n>
	       The devicefile(s) used to get the decode messages for ISDN card
	       unit <n> out of the kernel.


EXAMPLES

     The command:

	   isdndecode -f /var/tmp/isdn.decode

     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.


SEE ALSO

     isdnd(8)


BUGS

     Still one left.


STANDARDS

     ITU Recommendations I.430, Q.920, Q.921, Q.930, Q.931

     ITU Recommendation Q.932 (03/93), Q.950 (03/93)

     ETSI Recommendation ETS 300 179 (10/92), ETS 300 180 (10/92)

     ETSI Recommendation ETS 300 181 (04/93), ETS 300 182 (04/93)

     ITU Recommendation X.208, X.209


AUTHORS

     The isdndecode utility and this manual page were written by Hellmuth
     Michaelis <hm@kts.org>.

FreeBSD 5.4		       February 21, 2000		   FreeBSD 5.4

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