ADTRAN ISU 128 User Manual page 96

B. Ensure that the ISU 128 is set up with the correct SPID and LDN by
selecting CONFIG, Netw. options, Dial Line, Terminal ID, SPID/LDN.
C. Try swapping SPID1 with SPID2 and LDN1 with LDN2. Determine if
the problem is the second phone number or the quantity of phone
numbers.
D. Try another piece of functioning ISDN equipment with a U-interface
on the ISDN 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 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.
7. If the ISU 128 continues to read Register SPID #2, the ISU 128 has com-
pletely initialized the first phone number but is unable to establish logical
layer 3 for the second phone number. The problem is in one or more of
the following places:
• 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.
B. Ensure that the ISU 128 is set up with the correct SPID and LDN by
selecting CONFIG, Netw. options, Dial Line, Terminal ID, SPID/LDN.
C. Try swapping SPID1 with SPID2 and LDN1 with LDN2.
Determine if the problem is the second phone number or the quantity
of phone numbers.
D. Try another piece of functioning ISDN equipment with a U-interface
on the line.
61202.029L2-1
Chapter 11. Troubleshooting
ISU 128 User Manual 81