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Chapter 7: Troubleshooting
66 ISU 512 User Manual 61202.086L1-1
• The ISU 512 software setup
• The software setup of the telephone service provider
To isolate the problem, perform the following procedure.
1. Ensure the ISU 512 is set up with the correct SPID and LDN by selecting
CONFIG, Netw. options, Dial Line, Terminal ID, and SPID/LDN.
2. Try swapping SPID1 with SPID2 and LDN1 with LDN2, SPID3 with
SPID4 and LDN3 with LDN4, SPID5 with SPID6 and LDN5 with LDN6,
and SPID7 with SPID8 and LDN7 with LDN8. Determine if the problem
is the second phone number or the quantity of phone numbers.
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.