ISDN Connections
155
User’s Guide: Version 1.2
Connection established: Tracing the B channels
If a connection has been established you can inspect the appropriate B
channels using the same procedure mentioned above, but specifying a 1
or 2 (channels B1 and B2) in the channel parameter.
The following procedure could be used to obtain tracing data for an
ISDN connection between two BRICKs (system A and B). This example
assumes each system has one ISDN module with one BRI interface in-
stalled in slot 2.
1. Trace the D channel of system A in the background, and redirect the
output to a file.
bricktrace -H
systemA
0 0 2 >chD-sysA &
2. Trace the B channels of system A in the background and redirect the
output to a file.
bricktrace -H
systemA
-h2pi 1 0 2 >chB1-sysA &
bricktrace -H
systemA
-h2pi 2 0 2 >chB2-sysA &
3. Trace the D channel of system B in the background, and redirect the
output to a file.
bricktrace -H
systemB
0 0 2 >chD-sysB &
4. Trace the B channels of system B in the background, and direct the out-
put to a file.
bricktrace -H
systemB
-h2pi 1 0 2 >chB1-sysB &
bricktrace -H
systemB
-h2pi 2 0 2 >chB2-sysB &
5. All tracers have been started, start an activity on the target host.
telnet
host id
6. Wait at least 30 seconds. Close the telnet session, kill the six bricktrace
processes started earlier, and inspect the trace data.
kill
pid1 … pid6
vi *sysA *sysB
