HDLC-Frame Protocol User's Guide (February 2004)

Using HDLC.FRAME Protocol
Status and Error Messages
Chapter 3 25
The following unsolicited status codes may be received by an application
program from the HDLC.FRAME protocol.
IO_ALRDY_ENBL An enable request is received, while
HDLC.FRAME is already enabled. No action is
taken and this unsolicited status code is
returned with the UP/DOWN bit set to reflect
the state of the port.
IO_ALRDY_DSBL A disable request is received, while
HDLC.FRAME is already disabled. No action is
taken.
IO_RX_BUF Either the port or the card as a whole is running
low on free buffers. Some tuning of the ACC
configurable parameters may be required. Refer
to the section on “TTGEN” in the ACC Utilities
Reference Guide.
Table 3-2 Z7340A Interface Unsolicited Status Codes (Continued)
Unsolicited
Status Code
Description
Table 3-3 Other Non-E1/T1 Interface Unsolicited Status Codes
Unsolicited
Status Code
Description
IO_OK No error detected.
Normal communications have been established or
resumed.
ST25DSBL Terminal Disabled
ST25XDCD Loss of DCD signal
ST25XCTS Loss of CTS signal
IO_STATS This message is sent in response to a CW_STATS
control write. The data buffer contains a
x25l2stat_type structure (defined in zcomx25.h)