ISDNTRACE(8) BSD System Manager's Manual ISDNTRACE(8)
isdntrace -- isdn4bsd ISDN protocol trace utility
isdntrace [-a] [-b] [-d] [-f filename] [-h] [-i] [-l] [-n number] [-o]
[-p filename] [-r] [-u number] [-x] [-B] [-F] [-P] [-R unit]
isdntrace is part of the isdn4bsd package and is used to provide the user
with a 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 isdntrace utility is only available for passive supported cards.
All filenames, user specified or default, get a date and time stamp
string added in the form -yymmdd-hhmmss: a hyphen, two digits year,
month, day, a hyphen and two digits hour, minutes and seconds. Trace
files no longer get overwritten. In case a new filename is needed within
a second, the filename-generating mechanism sleeps one second.
In case the program is sent a USR1 signal, a new user specified or
default filename with a new date and time stamp is generated and opened.
The following options can be used:
-a Run isdntrace 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 setup.
-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 isdntrace<n> where n is the number of
the unit to trace).
-h switch display of header off (default on).
-i print layer 1 (I.430) INFO signals to monitor layer 1 activity
-l switch displaying of Layer 2 (Q.921) frames off (default on).
-n This option takes a numeric argument specifying the minimum frame
size in octets a frame must have to be displayed. (default 0)
-o switch off writing trace 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 trace).
-r Switch off printing a raw hexadecimal dump of the packets preced-
ing the decoded protocol information (default on).
-u Use number as the unit number of the controller card to trace
-x Switch on printing of packets with a non-Q.931 protocol discrimi-
nator. (default off).
-B Write undecoded binary trace data to a file for later or remote
analyzing (default off).
-F This option can only be used when option -P (playback from binary
data file) is used. The -F option causes playback not to stop at
end of file but rather to wait for additional data to be avail-
able from the input file.
This option is useful when trace data is accumulated in binary
format (to save disk space) but a monitoring functionality is
desired. (default off).
-P Read undecoded binary trace data from file instead from device
-R Use unit as the receiving interface unit number in analyze mode.
-T Use unit as the transmitting interface unit number in analyze
When the USR1 signal is sent to a isdntrace process, the currently used
logfiles are reopened, so that logfile rotation becomes possible.
The trace output should be obvious. It is very handy to have the follow-
ing 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.
1TR6 German-specific ISDN layer 3 protocol description. (NOTICE:
decoding of the 1TR6 protocol is included but not supported
since i dont have any longer access to a 1TR6 based ISDN
isdntrace automatically detects the layer 3 protocol being used by look-
ing at the Protocol Discriminator (see: Q.931/1993 pp. 53).
The device file(s) used to get the trace messages for ISDN card
unit <n> out of the kernel.
isdntrace -f /var/tmp/isdn.trace
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.trace-yymmdd-hhmmss (where yymmdd and hhmmss are replaced
by the current date and time values).
ITU Recommendations I.430, Q.920, Q.921, Q.930, Q.931
FTZ Richtlinie 1TR3, Band III
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
The isdntrace utility was written by Gary Jennejohn and
This manual page was written by
Hellmuth Michaelis <hmATkts.org>.
BSD February 13, 2000 BSD