User's Manual

30 Chapter3
Using HDLC.FRAME Protocol
Status and Error Messages
E1/T1 interface
The following unsolicited status codes may be received by an application
program from the HDLC.FRAME protocol on an E1/T1 interface.
Table 3-5 E1/T1 Interface Unsolicited Status Codes
Unsolicited
Status Code
Description
IO_OK No error detected.
Normal communications have been established or
resumed.
IO_DSBL Terminal Disabled
IO_TX_TMOUT Cable or local modem fault.
The physical connection to the remote device has been
lost.
IO_LONG_MSG Frame too long (SS7 only)
HDLC.FRAME has entered octet counting mode.
IO_RX_BUF No receive buffers
The number of available free buffers or message headers
on the interface card is dangerously low.
IO_ALRDY_ENBL Terminal already enabled
An enable request was received for an HDLC.FRAME
terminal which was already enabled.
IO_ALRDY_DSBL Terminal already disabled
A disable request was received for an HDLC.FRAME
terminal which was already disabled.
IO_STATS This message is sent in response to a
CW_STATS
control
write. The data buffer contains an
l2stat_type
structure (defined in
fw_types.h
). The
l2stat_type
structure is the same as the
x25l2stat_type
structure
mentioned above, except that it has some additional
fields.