User's Manual

Configuration
Configuring the X.25 Link
Chapter 346
Step 2. Enter or modify field values as required (refer to the field descriptions
below). Use the Help button to display information and instructions for
each field.
NOTE Because the timer values count the amount of time between
unacknowledged frames, you may need to increase the values of T1
(Retransmission Timer) and T3 (Idle Timer) if you use Modulo-128 with
a window size greater than seven.
Step 3. Click on OK to return to the “Configure X.25 Card” dialog when you have
finished verifying level 2 values.
Table 3-11 Verify Level 2 Values Field Descriptions
k - Level 2
Window Size
Maximum number of frames that can be
transmitted without an acknowledgment. The
range is 1 through 7 for Modulo-8 and 1 through
127 for Modulo-128. The default is 7. Use the
value given on your subscription form.
T1 -
Retransmission
Timer
Maximum number of milliseconds to wait for an
acknowledgment before retransmitting a frame.
The range is 100 to 12000. The default is 3000.
Use the value given on your subscription form.
T3 - Idle Timer Maximum number of milliseconds that a line can
be idle before it is declared disconnected. This
value should be greater than or equal to the
Retransmission Timer (T1) times the
Retransmission Count (N2). The range is 1000 to
240000. The default is 60000. Use the value given
on your subscription form.
N1 - Frame Size Maximum number of octets that can be
transmitted in a single frame. The range is 149
(minimum) through 4103. The default is 149.
N2 -
Retransmission
Count
Maximum number of times a given frame can be
transmitted before an error condition is
identified. The range is 0 through 255. The
default is 20.