3Com 3C13612, Command Reference Manual

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3Com Router Command Reference Guide — V1.00
Option Meaning
System view on the X.25 interface.
For related commands, see display x25 map , x25 reverse-charge-accept , x25
call-facility , x25 timer idle , x25 vc-per-map .
Example
# Set two mappings on the X.25 interface Serial0 and Serial1 respectively. The attribute
for each of the four mappings is different.
[3Com] channel interface serial 0
[3Com-Serial0] x25 map ip 202.38.160.11 x121-address 20112451
reverse-charge-request reverse-charge-accept
[3Com-Serial0] x25 map ip 202.38.160.138 x121-address 20112450 packet-size 512
512 idle-timer 10
[3Com] channel interface serial 1
[3Com-Serial1] x25 map ipx 20.30.4.1 x121-address 25112451 window-size 4 4
broadcast
[3Com-Serial0] x25 map ipx 20.30.4.8 x121-address 25112450 no-callin
logic-channel 6
5.1.29 x25 modulo
Syntax
x25 modulo modulus
undo x25 modulo
View
Interface view
Parameter
modulus : modulo size, whose value is 8 or 128. By default, modulo 8 is used..
Description
Using the x25 modulo command, you can configure the window modulus of an X.25
interface. Using the undo x25 modulo command, you can restore to the default value.
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 remote 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 modulo) is reached. For example, when the modulo is 8, the
numbering goes “…4, 5, 6, 7, 0, 1…”
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