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

Chapter 3 41
Using HDLC/LAP-B (ABM) Protocol
Status and Error Messages
Control Write Completion Status Codes
The following statuses are returned by the LAP-B protocol on E1/T1
hardware in response to control write requests. Although these are a
part of the standard status set, they are not used by all protocols, and
have a particular significance w ithin this protocol.
0IO_OK
No error detected
The request was successfully transmitted and
acknowledged by the remote side.
1 IO_DSBL Terminal disabled
The terminal must be enabled before it will accept
write or control write requests.
11 IO_LONG_MSG Message too long
Indicates one of the following errors:
• The packet length in the header is not zero.
• The control length in the header is not zero for a
CW_STATS
or
CW_REVCODE
request.
• The control length in the header is greater than six
for a
CW_TIMERS
request.
12 IO_SHRT_MSG Message too short
Indicates one of the following errors:
• The request length is less than four (too short to
contain the control write header).
• The control length in the header is less than six for
a
CW_TIMERS
request.
24 IO_BAD_CTL Bad control function or format
Indicates one of the following errors:
• The control length in the header does not equal the
request length plus four.
• The control code in the header contains a value
other than
CW_STATS
,
CW_REVCODE
or
CW_TIMERS
.
• The value specified for a timer resolution in a
CW_TIMERS
request is outside of the range zero to
four.