ACC Error Guide

X.25 Status and Completion Messages
Introduction
Chapter 4 75
mhdp->mrq.mrqstat contains one of the status codes listed below in
the lower seven bits of the field (e.g. bits 0-6).
Buffer Completion Statuses
At the link level (X.25 link ZLU), the following two buffer (write)
completion error statuses may be returned, as well as the more usual
standard statuses. Although these are a part of the standard status set,
they are not used by most protocols, and have a particular significance
within X.25. Either condition will prevent the transmission of any
frames across the local X.25 link. The defines for these status codes can
be found in the zcomstatus.h and zx25status.h include files.
22IO_LNK_DSCLink disconnected
23IO_LNK_RSTLink reset
For Virtual Circuit ZLUs (Level 3), the following buffer (write)
completion error statuses may be returned.
1IO_DSBLTerminal disabled
3IO_BUSYTerminal is busy for too long
20IO_DOWNTerminal down
21IO_NO_CALLNo call established
Also, the following completion statuses may apply to a configuration
control write to an X.25 link ZLU. These control writes are normally only
issued by the X.25 driver (zx25d).
24IO_BAD_CTLBad control function or format
25IO_INC_CTLInconsistent control write.
The parameters of the control write
are inconsistent with the current
setup of the logical channel
terminal.
26IO_UNA_CTLTemporarily unable to process
control write. The logical channel
terminal is not currently in a proper
state for processing the particular
control function.