Command Reference Guide

332 ● x25 modulo 3Com Router 5000 Family and Router 6000 Family
Command Reference
x25 modulo
Purpose Use the x25 modulo command to set the window modulus of an X.25 interface.
Use the undo x25 modulo command to restore its default window modulus.
Syntax x25 modulo modulus
undo x25 modulo
Parameters modulus
Modulus, whose value is 8 or 128.
If no value is specified, the default window modulus of
the X.25 interface is modulus 8 mode.
Example Set the modulus on the X.25 interface Serial0/0/0 to 128.
[3Com-Serial0/0/0] x25 modulo 128
View This command can be used in the following views:
■ Interface view
Description The slip window is the basis for X.25 traffic control, and the key about the slip
window is that the sent packets are numbered cyclically in order and are to be
acknowledged by the peer end. The order in numbering refers to the ascending order,
like “…2, 3, 4, 5, 6…” “Cyclically” means that the numbering starts again from the
beginning when a certain number (called modulus) is reached. For example, when the
modulus is 8, the numbering goes “…4, 5, 6, 7, 0, 1…”.
X.25 defines two numbering modulus: 8 (also called the basic numbering) and 128
(also called extended numbering), and the X.25 of the 3Com series routers supports
both views.
Related Commands ■ display interface
■ x25 call-facility
■ x25 map
■ x25 pvc
■ x25 switch pvc
■ x25 xot pvc
■ x25 fr pvc
■ x25 window-size