NetIPC 3000/XL Programmer's Reference Manual (5958-8600)

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B Cause and Diagnostic Codes
Cause and diagnostic can be read from X.25 packets using NetIPC
intrinsics. The following tables show possible cause and diagnostic
codes generated by the X.25 XL system access product. These codes are
a subset of the CCITT (1984 X.25 recommendation) specified values.