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PK-232 TECHNICAL MANUAL
A.4.7.1.3
Inactive Link Timer T3
The third timer, T3, is used whenever T1 isn't running to maintain link integrity. It is recom-
mended that whenever there are no outstanding unacknowledged I frames or P-bit frames (during
the information-transfer state), a RR or RNR frame with the P bit set to one be sent every T3 time
units to query the status of the other DXE. The period of T3 is locally defined, and depends greatly
on level 1 operation. T3 should be greater than T1, and may be very large on channels of high in-
tegrity.
A.4.7.2
Maximum Number of Retries (N2)
The maximum number of retries is used in conjunction with the T1 timer.
A.4.7.3
Maximum Number of Octets in an I Field (N1)
The maximum number of octets allowed in the I field will be 256. There shall also be an integral
number of octets.
A.4.7.4
Maximum Number of I Frames Outstanding (k)
The maximum number of outstanding I frames at a time is seven.
This document was originally downloaded from the TAPR archives and FTP site, as
was done by Bill Buthod, N5RRS. Last updated: 27 Dec 1997.
PK232TM Rev. A 5/87
APPENDIX A – AX.25 LEVEL 2 PROTOCOL
A-24
ax25.doc
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