ADTRAN L128 - Manual (Page 129)

Chapter 4: Troubleshooting
112 Express L128/L128T User Manual 61202.070L1-1
To isolate the problem, perform the following procedure:
A. Ensure the line is multipoint with two phone numbers.
B. Ensure that the Express L128/L128T is set up with the
correct SPID and LDN. For example:
SPID1 = 20572270460101
SPID2 = 20572270470101
LDN 1 = 7227046
LDN 2 = 7227047
C. Try swapping SPID1 with SPID2 and LDN1 with LDN2.
Determine if the problem is with the second phone num-
ber or the quantity of phone numbers.
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 SPIDs.
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.