Northern UTA220/UTA220k Parameter 2 Echo, Parameter 3 Selection of Data Forwarding Characters

D-Channel X.25

Parameter 2: Echo

This parameter establishes whether or not characters transmitted from the local DTE device to the PAD is echoed back to the local DTE device by the PAD. For example, if echo is enabled and the letter P is typed, the PAD transmits the

letter	P back to the terminal.
	Table 12-8: Echo
Value	Description

0No character echo

1Character echo enabled (under the restraints or (parameter 20) during all modes of the PAD *

default

Parameter 3: Selection of Data Forwarding Characters

Characters received from the local DTE device are stored by the PAD until the data forwarding character is received, or some other data forwarding condition has occurred. Parameter 3 designates the character or set of characters used to initiate the forwarding of the data stored by the PAD. Before the data forwarding character is transmitted to the PAD, the data stored by the PAD can be edited if parameter 15 is enabled.

Other conditions that cause the PAD to automatically forward the data stored by the PAD are as follows:

•If editing is disabled (parameter 15 = 0) and the PAD receives enough data to fill a packet, one full packet is forwarded.

•If editing is enabled (parameter 15 = 1) and the PAD receives enough data to fill the PAD editing buffer, the PAD forwards one full packet.

•If the maximum assembly timer expires before any other data forwarding conditions occur, the data currently stored by the PAD is forwarded. The maximum assembly timer is started on receipt of the first character being packeted by the PAD from the DTE and expires after 15 minutes.

•If editing is disabled (parameter 15 = 0) and the idle timer delay expires (as set by parameter 4), the data currently stored by the PAD is forwarded.

•If the PAD receives a break and the action to be performed upon receipt of a break is nothing (parameter 7 = 0), the data currently stored by the PAD is forwarded.

•If the PAD receives the first character of a PAD command signal after escaping from the data transfer mode, the data currently stored by the PAD is forwarded.

•If the PAD receives a set, read, or set and read PAD message from the remote DTE, the data currently stored by the PAD is forwarded.

12-20 UTA220/UTA220k