Nortel Networks 553-3001-211 Host answering an incoming data call, Host originating a data call

NT7D16 Data Access card Page 455 of 894

Table 153

Connect and disconnect protocol (Part 7 of 12)

Mode of
operation	Interface application	Comments
Mode 8	Host access for call	Host answering an incoming data call:
	origination and answering	Local DM user dials the access number to initiate
		the connection.
		DAC responds by driving RI ON for 2 seconds and
		OFF for 4 seconds until the Host answers by
		turning DTR ON. (If the Host always drives DTR
		ON, the DAC immediately answers the call
		without driving RI ON.)
		When Host receives RI ON, it should respond by
		turning DTR ON.
		DAC answers when it receives DTR ON.
		DAC turns DSR, DCD, and CTS ON when the call
		is completely established. The local DM user is
		now transparently linked to the Host.
		Host originating a data call:
		Host turns DTR ON to initiate the connection.
		DAC prepares to receive <CR> for autobaud.
		Host sends <CR> followed by other commands
		for establishing a data call (the DAC does not
		echo a command, nor does it send any prompt to
		the Host (blind dialing).
		When the data call is completely established, the
		DAC turns DSR, DCD, and CTS ON as long as
		the call is connected.

Circuit Card Description and Installation