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.
- 22 IO_LNK_DSC
Link disconnected
- 23 IO_LNK_RST
Link reset
For Virtual Circuit ZLUs (Level 3), the following buffer (write) completion
error statuses may be returned.
- 1 IO_DSBL
Terminal disabled
- 3 IO_BUSY
Terminal is busy for too long
- 20 IO_DOWN
Terminal down
- 21 IO_NO_CALL
No 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).
- 24 IO_BAD_CTL
Bad control function or format
- 25 IO_INC_CTL
Inconsistent control write.
The parameters of the control write are inconsistent with the current setup of the logical channel terminal.
- 26 IO_UNA_CTL
Temporarily unable to process control write. The logical channel terminal is not currently in a proper state for processing the particular control function.
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