ACC HDLC/LAP-B (ABM) User's Guide

38 Chapter3
Using HDLC/LAP-B (ABM) Protocol
Status and Error Messages
65 ST25DSBL Link disconnected on DISABLE
This status message is generated in response to a
terminal disable request after multiple frame
acknowledged operation has terminated. The down bit
will always be set.
77 ST25ENF ENABLE failed - bad config
This status message is generated in response to a
terminal enable request when the terminal’s
configuration is invalid. The down bit will always
be set.
The following unsolicited status messages are sent after an error occurs
when the l ink is in multiple frame acknowledged operatio n. The error
conditions include cable faults, inability to receive acknowledgment of
transmitted frames or receiving frames that are inconsistent with
multiple frame acknowledged operation. When one of these error
conditions occurs, the protocol attempts to re-establish multiple frame
acknowledged operation. After the attempt has either succeeded or
failed, the unsolicited status message that reflects the original error
condition is sent. If the attempt fails, the link is considered disconnected
and the down bit will be set in the status; otherwise the link has only
been reset and the down bit will be clear.
66 ST25XDCD Link disc. on loss of carrier
Thecardisnolongerreceivingtherequired
communications signals. This can be caused by
incorrect port configuration or disconnected/faulty
cabling.
68 ST25RTRY Exceeded retransmit limit
A frame was transmitted N2 times without receiving
an acknowledgment from the remote device.