Northern UTA220/UTA220k - Manual (Page 90)

12-14
UTA220/UTA220k
D-Channel X.25
PAD SERVICE SIGNALS
The local DTE may receive service signals from the PAD in
response to an issued PAD command or as the result of a packet
or network action. Table 12-2 shows the service signals that
may be transmitted to the local DTE by the PAD.
Table 12-2: PAD Service Signals
Command Extension Reason
* PAD is in the PAD command state and the
user can issue a PAD command
ENGAGED Response to PAD STATus command
FREE Response to PAD STATus command
PAR Parameter:
value or
Parameter: INV Response to set PAD command if one of the
parameters to be set is invalid or response to
set and read command or read command
ERR PAD command is in error
RESET See PAD Reset
Service Signals Resetting by the network or remote DTE
CLR See PAD Clear
Service Signals Clearing by the network or remote DTE
CLR CONF Confirmation of clearing either initiated by the
CLR PAD command or by the packet
CLR DER Restart on the network link or response to
packet virtual call request when the call
cannot be established
COM Call connected in response to a PAD Select
command or the receipt of an incoming call
(connection based upon acceptance of
incoming call by the packet)
XXX Line delete function performed for a printing
terminal
\ Character delete function performed for a
printing terminal
BS SP
BS
Character delete function performed for a
display terminal
CR LF Acknowledgment of a PAD command such
as RESET or INT