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Chapter 8. Troubleshooting
1.
Ensure that the ISU 512e is set up with the correct SPIDs and
LDNs.
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. Deter-
mine whether 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 512e 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 Identifier (TEI). Ask them to check the
ISDN line translation and ensure that the line supports dynamic
TEI allocation. Inform them that an NT1 and terminal adapter
device are connected to the ISDN line.
8-6
ISU 512e User Manual
61203086L1-1
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