Northern UTA220/UTA220k Pad Service Signals, 2 PAD Service Signals, Extension, Reason, D-Channel

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:	Response to set PAD command if one of the
	value or	parameters to be set is invalid or response to
	Parameter: INV	set and read command or read command
ERR		PAD command is in error
RESET	See PAD Reset	Resetting by the network or remote DTE
	Service Signals
CLR	See PAD Clear	Clearing by the network or remote DTE
	Service Signals
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		Character delete function performed for a
BS		display terminal
CR LF		Acknowledgment of a PAD command such
		as RESET or INT

12-14 UTA220/UTA220k