Allied Telesis AR300 series - Manuals

2 How to troubleshoot ISDN Step 1: Is the router communicating with the ISDN network at the signalling level? When the router is connected to the ISDN network, either by plugging it into an NT1 if the router has an S/T interface, or by plugging it directly into the ISDN network if the router has a U...

5 If the LAPD is not alive, the reason could be one of the following: 1. The TEI mode has been set incorrectly. On a Basic Rate interface, the TEI mode ought to be automatic, so that the router does not mandate a TEI value to the switch, but will automatically accept whatever value is assigned by th...

6 When it comes to diagnosing an ISDN connection, the two most important columns in this table are Duration and Cause. The Duration column The Duration column tells you immediately whether or not the call ever connected. If the entry in this column is CLEARED, then the call never connected. If the e...