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Chapter 4: Troubleshooting
112 Express XL/XLT User Manual 61200.070L1-1
To isolate the problem, perform the following procedure:
A. Ensure the line is multipoint with two phone numbers.
B. Ensure that the Express XL/XLT is set up with the correct
SPID and LDN. For example:
SPID1 = 20572270460101
SPID2 = 20572270470101
LDN 1 = 7227046
LDN 2 = 7227047
C. Try swapping SPID1 with SPID2 and LDN1 with LDN2.
Determine if the problem is with the second phone num-
ber or the quantity of phone numbers.
D. If possible, try another piece of functioning ISDN equip-
ment with a U-interface on the line.
E. With the Express XL/XLT connected to the line and pow-
ered up, talk to your 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 SPIDs. Ask
them to check the line translation, ensure the line sup-
ports dynamic TEI allocation, and verify the SPIDs. Tell
them that you have an NT1 and terminal adapter device
connected to the line.