Northern UTA220/UTA220k - Manual (Page 94)

12-18
UTA220/UTA220k
D-Channel X.25
To save the current X.3 parameter configuration to nonvolatile
memory, escape to command mode and enter AT&W
(see Escaping to AT Command Mode in Establishing an X.25
Session). Entering AT&W saves the port and current session
configuration as well as the X.3 parameters. The factory X.3
configuration can be restored by entering AT&F. This
command also restores port and current session configuration.
CCITT specifies two standard profiles for the X.3 parameter
set. The transparent profile is recommended for applications
such as file transfers. The transparent profile essentially
disables most of the PAD features so that the file can be
transferred completely unaltered (no padding, line feed
insertion, flow control characters, or service signal messages
when transmitted to the DTE). The simple profile is an
alternative configuration to the TA’ s default configuration for
simple interactive terminal applications. Table 12-6 lists the
X.3 parameters and the values supported by the TA.
18 Line display 18 Ctrl R (12H of ASCII Character
Table) is the line display
character
19 Editing PAD
service signals 2 Editing PAD service signals is
generated for display terminals
20 Echo mask 64 No echo of edit characters
21 Parity treatment 0 No parity check or generation
22 Page wait 0 Disabled
Table 12-6: CCITT X.3 Parameter Profiles
Parameter Description Transparent
Profile
Simple
Profile
1 PAD recall using a character 0 1
2 Echo 0 1
3 Data forwarding character selection 0 126
4 Idle timer delay selection 1 0
5 Ancillary device control 0 1
6 Control of PAD service and command
signals 0 1
7 Action of PAD on break from DTE 0 0
8 Discard output 0 0
9 Padding after carriage return 0 0
Table 12-5: Default X.3 Parameters (Continued)