ADTRAN 1200051L6, 61200051L1, 1200051L2, 1200051L5 user manual Troubleshooting

Chapter 10. Troubleshooting

7.If the ISU 2x64 continuously reads Register SPID #2,the ISU 2x64 has completely initialized the first phone number but is unable to establish logical layer 3 for the second phone num- ber. The problem is in one or more of the following places:

•The ISU 2x64 software setup

•The telephone service provider’s software setup

To isolate the problem, perform the following procedure:

A.Ensure the ISDN line is multipoint with two phone numbers.

B.Ensure that the ISU 2x64 is set up with the correct SPIDs and LDNs.

C.Try swapping SPID1 with SPID2 and LDN1 with LDN2. Determine if the problem is the second phone number or the quantity of phone numbers.

D.Try another piece of functioning ISDN equipment on the ISDN line.

E.With the ISU 2x64 connected to the ISDN line and pow- ered up, talk to the service provider’s repair group and tell them you have an ISDN basic rate line that appears physically okay but is unable to register its SPID(s).

Ask them to check the line translation, ensure that the ISDN line supports dynamic TEI allocation, and verify the SPID(s). If using the ISU 2x64 part number 1200051L1 or 1200051L3 with the U-interface, tell them that you have an NT1 and terminal adapter device con- nected to the line.

82 ISU 2x64 Dual Port ISDN Service Unit User Manual 61200051L1-1D