3Com S200 manual ATPAD Operation, ATPAD Data Forwarding Criteria, Criteria Descriptions

ATPAD Ports

ATPAD Operation

ATPAD

Data Forwarding Criteria

An ATPAD port operates in either a Command Mode or Data Mode. This port type is always in the Command mode whenever a call is not taking place.

When the ATPAD is in the Command mode, it receives characters from the attached terminal device, processes them using the ATPAD command processor, and sends a response (or result code) to the terminal. It does not forward the command to the network.

The ATPAD is in data mode when there is an X.25 network call in place to a remote device. In data mode, it receives characters from the terminal device, packetizes them, and forwards them through the network to the remote device.

You can select the format for printing with the port parameter “Result Codes”. The options are:

•ALPHA—Result codes are printed in all capitals. They are printed on a new line and the cursor is advanced to the next new line. (<CR><LF> Result Code <CR><LF>).

•NUM—The numerical equivalent result code is printed followed by a <CR>.

•NONE—No result codes are displayed.

Criteria Descriptions

This table describes three criteria used to packetize and forward data to the network.

If you want to...	Then use...
Forward data on full packets...	Forward on full packet.
	The ATPAD always forwards on full
	packets.
	You can configure the maximum packet size
	as 128, 256, 512, or 1024 bytes. You can
	select one of the other two criteria so that
	the ATPAD forwards data before a full
	packet has been assembled.
Packetize and forward the characters	Forward on Data Forwarding Character.
received since the last time	You can use the Data Forwarding Timer in
expiration....
	interactive sessions where the host
	(Echoplex) echoes the characters typed by
	the terminal equipment. If you want the
	characters to be echoed as quickly as
	possible, set the Data Forwarding Timer to a
	low value. If you set the Data Forwarding
	Timer to a zero value, you disable this
	function.
Send records or command to the host	Forward on Data Forward Character
and they are always terminated by
the same character, for example;
<CR>...

58 Configuring PAD/ATPAD Ports