ACC X.25 Protocol User's Guide

ZX25D X.25 Protocol Driver
Configuration
Chapter 3 29
Configuration
This section describes how to create a TTGEN configuration file for the
ACC X.25 subsystem. That is, it discusses those parts of the TTGEN that
are specific to X.25 configuration. For a general discussion of the TTGEN
configuration file, you should consult the ACC Utilities Reference Guide.
This section assumes that the reader has previously configured a ZCOM
subsystem and is familiar with the format and content of a TTGEN
configuration file.
The parts of the TTGEN configuration file relevant to X.25 are:
• Reserved logical data area definition
• Mux definitions
• Port definitions
• Terminal definitions (for each X.25 link and virtual circuit)
• Device Option Word definitions
Reserved Logical Data Area Definition
An area in the logical terminal table extension (LTT) area must be
reserved for the zx25d driver for the X.25 link terminal ZLUs. This
reserved area must start from byte zero in this LTT extension area. This
reserved area will contain the X.25 configuration, statistical data, and
state information for each X.25 link. The size of the area required by
zx25d can be found by running zx25d_init (with or without the ZCOM
system). The zx25d driver displays its revision code and the table area
required in the ZCOM log file.
The definition for the required reserved area is as follows:
logical-data 10 X25CNT 0 X25CNT_LDSIZE
“10” is the application number for the X.25 link terminals.
X2SCNT_LDSIZE needs to be a multiple of 8.
If it is necessary to configure call user data for any outgoing calls from
X.25 switched virtual circuits, then it will also be necessary to define
another logical data area for the application number of these terminals.
A definition for the X25UDT Logical-Data area is required if the Udata