ACC X.25 Protocol User's Guide

ZX25D X.25 Protocol Driver
Implementation Notes
Chapter 360
Level 2 X.25 Timers
NOTE T1, and T3/T4 may be independently set by the use of the T1_timer,
T2_timer, and T3_T4_timer keywords in the X.25 link terminal
definition. See the “X.25 Link Term Definitions” section.
Level 3 X.25 Timers
DTE - Mandatory Timers:
T1 - T2 * 2 (see note)
T2 - Configurable (20 milliseconds to 630 seconds)
T4 - N2*T1*6 approx. (see note)
DCE - Timers:
T1 - T2 * 2 (see note)
T2 - Configurable (20 milliseconds to 630 seconds)
T3 - N2*T1*6 (see note)
DTE - Mandatory Timers:
T20 - 180 seconds
T21 - 200 seconds
T22 - 180 seconds
T23 - 180 seconds
T26 - 180 seconds
DTE - Optional Timers:
T24 - Not Supported
T25 - 180 seconds (when enabled - configurable option)
T27 - Not Supported