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isdndecode - isdn4bsd ISDN protocol decode utility


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


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 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 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).
-P Read undecoded binary decode data from file instead from device (default off).
-R Use unit as the receiving interface unit number in analyze mode.
-T Use unit as the transmitting interface unit number in analyze mode.

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 following 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.


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


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.






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