Northern UTA220/UTA220k manual 6 CCITT X.3 Parameter Profiles, Transparent, Simple, D-Channel

D-Channel X.25

Table 12-5: Default X.3 Parameters (Continued)

18	Line display	18	Ctrl R (12H of ASCII Character
			Table) is the line display
			character
19	Editing PAD	2	Editing PAD service signals is
	service signals		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

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.

Table 12-6:CCITT X.3 Parameter Profiles

Parameter	Description	Transparent	Simple
		Profile	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	0	1
	signals
7	Action of PAD on break from DTE	0	0
8	Discard output	0	0
9	Padding after carriage return	0	0

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