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Chapter 11. Troubleshooting
80 ISU 128 User Manual 61202.029L2-1
5. If the ISU 128 continues to read Register SPID #1, the ISU 128 is physically
connected to the local telephone service provider and has established log-
ical layer 2. The ISU 128 is unable to establish layer 3. The problem may
be one or more of the following:
• The ISU 128 software setup
• The telephone service provider's software setup
To isolate the problem, use the following procedure:
A. Ensure the ISU 128 is set up for the correct switch protocol by selecting
CONFIG, Netw. options, Dial line, Switch protocl.
B. Ensure the ISDN line is multipoint.
C. Make sure that the ISU 128 is set up with the correct SPID and LDN by
selecting CONFIG, Netw. options, Dial Line, Terminal ID, SPID/LDN.
D. Try another piece of functioning ISDN equipment with a U-interface on
the line.
E. With the ISU 128 connected to the ISDN line and powered up, talk to your
service provider's repair group and tell them you have an ISDN basic rate
line that appears physically okay but has no terminal endpoint identifier
(TEI). Ask them to check the line translation and ensure that the line
supports dynamic TEI allocation. Tell them that you have an NT1 and
terminal adapter device connected to the line.
6. If the ISU 128 continues to read Getting TEI #2, the ISU 128 has completely
initialized the first phone number but is unable to establish logical layer 2
for the second phone number. The problem may be one or more of the fol-
lowing:
• The ISU 128 software setup
• The telephone service provider's software setup
To isolate the problem, use the following procedure:
A. Ensure the ISDN line is multipoint with two phone numbers.