ACC X.25 Protocol User's Guide

134 AppendixA
X.25 Status and Completion Messages
Unsolicited Status Messages
an enable of the X.25 link ZLU. Most likely the remote
endofthelinkisnotrespondingtotheHDLC/LAP-B
protocol packets sent by the ACC.
If bit 7 = 0, then the link is u p (at level 2).
ST25DSBL (65) TheX.25linkhasbeendisconnectedduetoadisable
request on the X.25 link ZLU.
ST25XDCD (66) X.25 Link disconnected or restarted due to loss of
DCD. Bit 7 of the mrqstat field will indicate the current
up/down state of the link.
ST25XCTS (67) X.25 Link disconnected or restarted due to loss of CTS.
Bit 7 of the mrqstat field will indicate the current
up/down state of the link.
ST25RTRY (68) X.25 Link disconnected or restarted due to
retransmission counter N2 being exceeded. Bit 7 of the
mrqstat field will indicate the current up/down state of
the link.
ST25TXFR (69) X.25 Link disconnected or restarted due to a
transmitted FRMR (Frame Reject). Bit 7 of the mrqstat
field will indicate the current up/down state of the link.
ST25RXFR (70) X.25 Link disconnected or restarted due to a received
FRMR frame. Bit 7 of the mrqstat field will indicate the
current up/down state of the link.
ST25RXDM (71) X.25 Link disconnected or restarted due to a received
DM (Disconnect Mode) frame. Bit 7 of the mrqstat field
will indicate the current up/down state of the link.
ST25RXSA (72) X.25 Link disconnected or restarted due to a received
SABM (Set Asynchronous Balanced Mode) frame. Bit 7
of the mrqstat field will indicate the current up/down
state of the link.
ST25RXDI (73) X.25 Link disconnected due to a received DISC
(Disconnect) frame. Bit 7 of the mrqstat field will
indicate the current up/down state of the link. For this
particular status code, bit 7 should always be set to 1
indicating the link is down.