ACC X.25 Protocol User's Guide

140 AppendixA
X.25 Status and Completion Messages
Unsolicited Status Messages
ST26LCDN (115) The Virtual Circuit is now in the DOWN state. This
status message usually indicates the completion of the
Call Clear processing for an SVC. Note that if you have
issued a Clear Request, you should not attempt to place
a call on this VC until you receive this status message.
This status message also contains two bytes of data:
Byte 1 = Cause code
Byte 2 = Diagnostic code
ST26LCTPD (116) The VC ZLU has been deactivated. This status
indicates that the VC has been placed into an inbound
flow control mode. That is, an inbound data packet on
this VC will result in a level 3 RNR being transmitted.
ST26LCDSB (117) The VC ZLU has been disabled. A disabled VC ZLU
may not be used to accept or p lace calls (SVC) or to
transfer data (PVC). Any call that was established has
been cleared.
ST26LCRST (118) VC Reset Request confirmation received. This
indicatesthat the Reset request processing is complete.
Either a reset collision has occurred or the remote end
of the link has confirmed the reset request.
** ST26CLRCV (119) Inbound Ca ll Request received on t he SVC ZLU.
This status is only received when the ACK bit is set to
0 in the VC ZLU’s o ption word. Th e ACC X.25
subsystem will automatically attempt to send a Call
Accept packet. Note that this status message i s
accompanied by a data buffer containing the contents
of the Call packet.
** ST26CLRCF (120) Inbound Call Request received on t he SVC ZLU
requiring application acknowledgment. This status is
only received when the ACK bit is set to 1 in the VC
ZLU’s option word. If the application does not
acknowledge t he inbound call (using zx25callacc or
zx25callrej) within 60 seconds , the call will be
automatically cleared by the ACC X.25 subsystem.
Note thatthis status message is accompanied by a data
buffer containing the contents of the Call packet.
** ST26LCRSR ( 121) Reset Indication received on VC. If the RSET bit
is set to 1 in the VC ZLU’s option word, then the
application is required to confirm the reset within 60