ZyXEL 202H 91-003-194001B User Manual

P-202H Plus v2 User’s Guide

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Chapter 36 Troubleshooting

Table 111   Troubleshooting the ISDN Line

The ISDN initialization failed. This 

problem occurs when you attempt 

to save the parameters entered in 

the Wizard Setup or WAN screen 

or SMT Menu 2, but receive the 

message, 'Save successful, but 

Failed to initialize ISDN; Press 

[Esc] to exit'.

Check the error log (in Menu 24.3.1), you should see a log entry for 

the ISDN initialization failure in the format, 'ISDN init failed. 

code<n> . . .'. Note the code number, n.
If the code is 1, the ISDN link is not up. This problem could be 

either the ISDN line is not properly connected to the ZyXEL Device 

or the ISDN line is not activated. Verify that the ISDN line is 

connected to the ZyXEL Device and to the wall telephone jack.
If the code is 3, this indicates a general failure. Verify the 

provisioning information for your switch by contacting your 

telephone company.
Check your SPID numbers if the ISDN LED is blinking slowly as this 

indicates that SPID negotiation has failed (North America only).

The ISDN loopback test failed.

If the ISDN initialization is successful, then the loopback test should 

also work. Verify the telephone numbers that have been entered in 

the Wizard Setup or WAN screen or SMT Menu 2. The loopback 

test dials the number entered in the second Phone # field (except 

for switch types with only one phone number). If you need to dial a 

prefix (e.g., '9') to get an outside line, then you have to enter the 

telephone number as '95551212' or '914085551212'. If it is an 

internal line, you may only need to enter the last four or five digits 

(according to your internal dialing plan), e.g., 51212.

Table 112   Troubleshooting Remote User Dial-in 

A remote user cannot dial-in.

First verify that you have configured the authentication parameters 

in Menu 13. These would be CLID Authen and Recv Authen.
In Menu 14.1, verify the user name and password for the remote 

dial-in user.
If the remote dial-in user is negotiating IP, verify that the IP address 

is supplied correctly in Menu 13. Check that either the remote dial-

in user is supplying a valid IP address, or that the ZyXEL Device is 

assigning a valid address from the IP pool.
If the remote dial-in user is negotiating IPX, verify that the IPX 

network number is valid from the IPX pool (if it is being used).