Chapter 4: Troubleshooting
110 Express L128/L128T User Manual 61202.070L1-1
5. If the Loop Status in the Express L128/L128T Status menu continuously
reads Register SPID #1, then the Express L128/L128T is physically con-
nected to your local telephone service provider and has established logical
layer 2. The Express L128/L128T is unable to establish layer 3. The prob-
lem is in one or both of the following places:
• The Express L128/L128T software setup
• The telephone service provider’s software setup
To isolate the problem, perform the following procedure:
A. Ensure the Express L128/L128T is set up for the correct
switch type.
B. Make sure the line is multipoint.
C. Make sure the Express L128/L128T is set up with the cor-
rect SPID and LDN. For example:
SPID1 = 20572270460101
SPID2 = 20572270470101
LDN 1 = 7227046
LDN 2 = 7227047
D. If possible, try another piece of functioning ISDN equip-
ment with a U-interface on the line.
E. With the Express L128/L128T connected to the line and
powered up, talk to your service provider’s repair group
and tell them you have an ISDN basic rate line that ap-
pears physically okay but is unable to register its SPID(s).
Ask them to check the line translation, ensure the line
supports dynamic TEI allocation, and verify the SPIDs.
Tell them that you have an NT1 and terminal adapter de-
vice connected to the line.
