ACC X.25 Protocol User's Guide

ZX25D X.25 Protocol Driver
Virtual Circuit Definitions
Chapter 3 45
Virtual Circuit Definitions
The virtual circuits (switched and permanent) for X.25 are defined using
the TERM definition line in the TTGEN configuration file. The virtual
circuit definition defines those parameters required for level 3 of the
X.25 protocol.
A sample virtual circuit definition is given below:
Term 120 01:4:1 X25.SVC.AUTO X25_VC_Q0_D0 ~
79 1 201 0 1 CALL:226633011 ”X.25 SVC out to 33011”
Udata ”USERDATA”
This line defines a virtual circuit terminal on Mux 1, port 4, subchannel
1, which will issue an outgoing call when enabled and which will be
automatically recovered after a link failure. The outgoing call will be
made to the remote subscription address 226633011 unless overridden.
User data of “USERDATA” will be included in outgoing calls made on
this virtual circuit.
The Terminal-Definition takes the following general format:
Term zlu mux:port:subc device poll select
appl_no inst_no brch_no wkst_no area_no CALL:<addr> name
<Option keyword> <value>
<Udata keyword> <value>
More specific information on the parameters in the VC terminal
definition follows.
zlu This number (120 in the example) assigns a unique
reference number for this Virtual Circuit terminal,
which is used by the ACC X.25 software to relate errors
displayed to a specific X.25 Virtual Circuit. The ZLU
number is also used in the ACC X.25 API calls to
control and configure specific X.25 Virtual Circuits.