ACC X.25 Protocol User's Guide

Chapter 3 41
ZX25D X.25 Protocol Driver
Configuration
Extended K : When level 2 modulo 128 sequence number is selected
by setting L2E to 1, the level 2 window size is specified
by combining “Extended K” (providing the most
significant bits 6 through 3) with “K” from the select
word (providing the least significant bits 2 through 0).
The allowable values for the level 2 window size with
modulo 128 operation is from 1 to 127.
CAUTION: Choosing large values for the window
size may cause the interface card to run low on
transmit buffers.
Max_inpacket : The maximum L3 packet size expected on this link.
The table below shows the valid max_inpacket
parameter values in the left column and the
corresponding maximum L3 packet size in the right
column.
Valid max_inpacket Parameter
Value
Maximum L3 Packet Size
0 - 128 8 - 256
1 - Reserved 9 - 512
2-Reserved 10-1024
3 - Reserved 11 - 2048
4 - 16 12 - 4096
5 - 32 13 - Reserved
6 - 64 14 - Reserved
7-128 15-240