ACC X.25 Protocol User's Guide

X.25 Status and Completion Messages
Unsolicited Status Messages
Appendix A 137
ST25BADPS (93) Bad P(S) in received packet. This indicates that a
data packet received on a VC contained an invalid
sequence number in the P(S) field. This will cause the
VC to be reset.
ST25BADPR (94) Bad P(R) in received packet. This indicates that a
data packet received on a VC contained an invalid
sequence number in the P(R) field. This will cause the
VC to be reset.
ST25RXREJ (95) The VC received a REJECT packet. This will cause
the VC to be reset.
ST25LCCTO (96) A Virtual Circuit control timeout has occurred. This
indicates that the remote end of the link has not
responded to a protocol packet within the appropriate
amount of time. For example, when a Clear Request
packet is sent, the remote end must respond within
timer T23 seconds with a Clear Confirm. This status
message is sent when the timer expires without having
seen a response from the remote end of the link.
Typically, this will cause the VC to be reset or cleared
depending on the particular protocol packet that timed
out.
ST25DATTO (97) VC data acknowledgment timeout has occurred. That
is, the remote end of the link has not RR’d a sent data
packet within the required T25 time. Note that if the
T25 timer is disabled, this status message will not be
generated. This will cause the VC to be reset.