Web Interface Settings Glossary 93
HDLC Menu (VHSI/Protocol Tree) > Timers Group (when protocol is set to X.25)
These parameters are only available when the protocol is set to X.25.
Checkpoint T1
Defines the Check Point Timer, which specifies how long to wait for a response from the
remote device before an attempt is made to determine its status. This parameter should be set to
slightly greater than twice the transmiss ion time of the longest frame.
Range: 200-9999 milliseconds. Default: 2900 milliseconds.
Ack Delay T2
Defines the Ack Delay Timer.
To optimize communications efficiency, acknowledgments can be piggy-backed onto outgoing
frames rather than being sent out on their own. The Ack Delay Timer defines the length of time
the device should wait for an outgoing information frame, before sending the acknowledgement
by itself. This setting (T2) should always be much less than the Check Point Timer (T1);
otherwise, the remote device may time out and try to recover before the acknowledgment is
received.
Range: 0-9999 milliseconds. Default: 200 milliseconds.
Idle Probe T3
Defines the Idle Probe Timer, which specifies how long the link should remain idle before the
Eicon 1530 sends an RR (Receiver Ready) frame, with a P bit set, to the remote device. This is
done in order to determine its status. The remote device, if still functioning, will respond using
an RR frame with the F bit set.
Range: 0-99999 milliseconds. Default: 15000 milliseconds.