ADTRAN 1203086L1, Manual

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Chapter 8. Troubleshooting
8-2 ISU 512e User Manual 61203086L1-1
not-in-service intercept is received, then there is probably some-
thing wrong with the translation of the ISDN line. Contact the
phone service provider for help.
3. If the ISU 512e continues to read D
OWN
, there is a physical prob-
lem with the ISDN line (probably Layer 1 setup). The problem is
one or more of the following:
•
The ISU 512e software setup
• The ISU 512e hardware
• CPE wiring
• Wiring from the telephone service provider
• Hardware of the telephone service provider
• Software setup of the telephone service provider
To isolate the problem, perform the following procedure:
A. Ensure the ISDN line is plugged into the correct IFC con-
nector on the back of the ISU 512e.
B. Ensure the ISU 512e is configured for D
IAL
L
INE
service.
C
ONFIG
, N
ETW
.
OPTIONS
, and D
IAL
L
INE
should be selected
from the menu.
C. Connect another piece of functioning ISDN equipment to
the ISDN line.
D. Contact the service provider and ensure that you have an
ISDN Basic Rate U-Interface with 2B1Q line coding
(wrong options are an S or T interface or AMI line coding).
E. Ensure the ISDN phone lines are connected to the actual
ISDN telephone line (Basic Rate interface) provided by the
telephone company. Ensure the ISDN line is not connected
through another piece of equipment in a wiring closet.
F. Ensure nothing else is bridged across the ISDN line pair.
G. With a minimum of extra wiring, try connecting to the
line pair at the point where service provider's wiring ends.
H. With the ISU 512e connected to the ISDN line and pow-
ered up, contact and inform the service provider's repair
group that your ISDN basic rate line has a Physical Layer
1 problem. Request that the ISDN line be checked.