Chapter 7: Troubleshooting
IF THE DISPLAY READS SPID{1,3,5, OR 7}
This section does not apply to installations outside of North America.
If the ISU 512 reads SPID1, then the ISU 512 is physically connected to the lo- cal telephone service provider and has established Logical Layer 2. The ISU 512 is unable to establish layer 3. The problem is with one or more of the fol- lowing:
•The ISU 512 software setup
•The software setup of the telephone service provider
To isolate the problem, use the following procedure:
1.Ensure the ISU 512 is set up for the correct switch type by selecting CON- FIG, Netw. options, Dial Line, and Switch type.
2.Ensure that the ISU 512 is set up with the correct SPID and LDN by select- ing CONFIG, Netw. options, Dial Line, Terminal ID, and SPID/LDN. Review the section Setting the SPID in the chapter Configuration.
3.Connect another piece of functioning ISDN equipment to the ISDN line.
4.With the ISU 512 connected to the ISDN line and powered up, talk to your service provider's repair group and inform them you have an ISDN basic rate line that appears physically OK but has no Terminal Endpoint Identi- fier (TEI). Ask them to check the ISDN line translation and ensure that the line supports dynamic TEI allocation. Inform them an NT1 and terminal adapter device are connected to the ISDN line.
IF THE DISPLAY READS SPID{2,4,6, OR 8}
This section does not apply to installations outside of North America.
If the ISU 512 continues to read SPID2, the ISU 512 has completely initialized the first phone number but is unable to establish Logical Layer 3 for the second phone number. The problem is with one or more of the following:
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