Digital Equipment DEC 3000 Series Service Information page 159

ISDN Diagnostic,
Error Reporting
Continued
The diagnostic reports any error that it finds. Error messages
include a hexadecimal longword of data and an FRU code to
identify the failing FRU:
>>> T ISDN
?? 002 ISDN xxxxxxxx
Table 4–20 describes the ISDN diagnostic error messages and
identifies the FRU to replace.
Table 4–20 ISDN Error Identification
Test
Failure FRU
Code Code
?? 002
Failing
Test Error Code
ISDN Appendix C
Replace...
I/O module
4–35