ADTRAN Express L128T S User Manual page 133

H. With the Express L128T S/T connected to the line and pow-
ered up, talk to your service provider's repair group and in-
form them that your ISDN basic rate line has a physical Layer
1 problem. Ask them to check the line.
4. If the Loop Status in the Express L128T S/T Status menu continu-
ously reads Getting TEI #1, then the Express L128T S/T is physi-
cally connected to your local telephone service provider but is
unable to establish logical layer 2. The problem is in one or more
of the places listed below:
• The Express L128T S/T software setup
• The telephone service provider's software setup
• Hardware configuration, if the line is extended from the
switch
To isolate the problem, perform the following procedure:
A. Ensure the Express L128T S/T is setup for the correct switch
type.
B. If possible, try another piece of functioning ISDN equipment
with an S/T interface on the line.
C. With the Express L128T S/T 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 physical-
ly okay but has no terminal endpoint identifier (TEI). Ask
them to check the line translation and ensure that the line sup-
ports dynamic TEI allocation.
61202070L3-20 Express L128T S/T User Manual
Chapter 4. Troubleshooting
4-3