User guide

10-18 Advanced ISDN troubleshooting
Advanced ISDN troubleshooting
By using the Troubleshooting page you can find out more about the source of
ISDN connection problems. Record the results and output from your checks
and have these at hand if you need to ask for assistance from your network
administrator at the remote office, your ISDN service provider or your
authorised Allied Telesyn distributor or reseller.
Test your own router
Your router can perform a self test to check itself for faults, and show you the
results of this self test. This will show that either:
■
Your router is OK, and your ISDN connection problems are caused by a
fault in the ISDN network, your router’s connection to it, or configuration
errors. Go to “Show ISDN call connections” on page 10-18.
OR
■
Your ISDN connection problems are caused by a faulty router, and you
should contact your authorised Allied Telesyn distributor or reseller.
Note: The router cannot perform any of its normal operations while it is self
testing.
To run a self test on the router select an interactive command session on the
Management Wizard Troubleshooting page (Figure 10-12).
In the Command Session page that opens enter the command:
ENABLE TEST INT=BRI0
and click Execute. The System LED lights. Wait for four minutes, then enter the
command:
SHOW TEST
and click Execute. If the output shows the result for the completed BRI0 test to
be “good”, that is, it includes the line:
BRI0 complete good
then the router has not detected any physical fault in the router’s Basic Rate
ISDN interface. If the result is not “good” there may be a fault in your router.
Show ISDN call connections
If the router has a LAPD connection to the switch (the Test Connection result
shows the ISDN link to be Active), then when an outgoing call is made from
the router, it sends a call setup message to the switch. If the switch believes that
the message packet is valid and there are channels available in the ISDN
network, it will forward it to the router at the other end of the call. The
receiving router will then either accept or reject the call, depending on the
contents of the packet.
If the receiving router accepts the call setup request, the ISDN call opens, and
the routers will endeavour to exchange data packets. If the call does not open
there is no exchange of data. To show whether calls are opening, select ISDN
Calls in the ISDN Output field on the Troubleshooting page and click View