ADTRAN 1200070L1 - Manual (Page 125)

Chapter 4: Troubleshooting
61200.070L1-1 Express XL/XLT User Manual 109
G. With a minimum of extra wiring, try connecting to the
line pair at the point where the service provider’s wiring
ends.
H. With the Express XL/XLT connected to the line and pow-
ered up, talk to your service provider’s repair group and
inform them that your ISDN basic rate line has a physical
Layer 1 problem. Ask them to check the line. Tell them
that you have an NT1-like device at the end of the line.
4. If the Loop Status in the Express XL/XLT Status menu continuously reads
Getting TEI #1
, then the Express XL/XLT is physically 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 XL/XLT 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 XL/XLT is setup 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 equip-
ment with a U-interface on the line.
D. 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 has no terminal endpoint identifier
(TEI). Ask them to check the line translation and ensure
that the line supports dynamic TEI allocation. Tell them
that you have an NT1 and terminal adapter device con-
nected to the line.