ADTRAN Express 4120 - Manual (Page 139)

Chapter 4. Troubleshooting
61200176L3-1 Express 4110/4120 User Manual 4-3
4. If the Loop Status in the Express 4110/4120 Status menu continuously
reads Getting TEI #1, then the Express 4110/4120 is physically con-
nected to your local telephone service provider but is unable to estab-
lish logical layer 2. The problem is in one or more of the places listed
below:
• The Express 4110/4120 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 4110/4120 is set up for the correct switch type.
B. Ensure the quality of your line is satisfactory by checking for near
and far end block errors (NEBEs and FEBEs). If the counts are
non-zero, there may be a physical link problem as described in
step 3.
C. If possible, try another piece of functioning ISDN equipment with
a U-interface on the line.
D. With the Express 4110/4120 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 appears physically okay but has
no terminal endpoint identifier (TEI). Ask them to check the line
translation and ensure that the line supports dynamic TEI alloca-
tion. Tell them that you have an NT1 and terminal adapter device
connected to the line.
5. If the Loop Status in the Express 4110/4120 Status menu continuously
reads Register SPID #1, then the Express 4110/4120 is physically
connected to your local telephone service provider and has estab-
lished logical layer 2. The Express 4110/4120 is unable to establish
layer 3. The problem is in one or both of the following places:
• The Express 4110/4120 software setup
• The telephone service provider’s software setup
To isolate the problem, perform the following procedure:
A. Ensure the Express 4110/4120 is set up for the correct switch type.
B. Make sure the line is multipoint.