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Chapter 10. Troubleshooting
82
ISU 2x64 Dual Port ISDN Service Unit User Manual 61200051L1-1D
7. If the ISU 2x64 continuously reads Register SPID #2, the ISU
2x64 has completely initialized the first phone number but is
unable to establish logical layer 3 for the second phone num-
ber. The problem is in one or more of the following places:
• The ISU 2x64 software setup
• The telephone service provider’s software setup
To isolate the problem, perform the following procedure:
A. Ensure the ISDN line is multipoint with two phone
numbers.
B. Ensure that the ISU 2x64 is set up with the correct SPIDs
and LDNs.
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 on
the ISDN line.
E. With the ISU 2x64 connected to the ISDN line and pow-
ered up, talk to the service provider’s repair group and
tell them you have an ISDN basic rate line that appears
physically okay but is unable to register its SPID(s).
Ask them to check the line translation, ensure that the
ISDN line supports dynamic TEI allocation, and verify
the SPID(s). If using the ISU 2x64 part number
1200051L1 or 1200051L3 with the U-interface, tell them
that you have an NT1 and terminal adapter device con-
nected to the line.