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D-Channel X.25
Parameter 2: Echo
Value
0
No character echo
1
Character echo enabled (under the restraints or (parameter 20)
during all modes of the PAD *
default
Parameter 3: Selection of Data Forwarding Characters
12-20
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
Description
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.
UTA220/UTA220k
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