Nortel Networks 553-3001-211 manual Terminal answering an incoming data call

Page 458 of 894 NT7D16 Data Access card

Table 153

Connect and disconnect protocol (Part 10 of 12)

Mode of
operation	Interface application	Comments
Mode 12	Terminal access for call	Terminal answering an incoming data call:
	origination and answering	DAC drives DSR, DCD, and CTS ON in the idle
		state.
		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 terminal answers by
		turning DTR ON (if the terminal always drive DTR
		ON, the DAC immediately answers the call
		without driving RI ON).
		When terminal receives RI ON, it should respond
		by turning DTR ON.
		DAC answers when DTR goes ON and the local
		DM user is now transparently linked to the
		terminal.
		Terminal originating an outgoing data call:
		DAC drives DSR, DCD, and CTS ON in the idle
		state.
		Terminal turns DTR ON to initiate the connection.
		DAC prepares to receive <CR> for autobaud.
		Terminal sends <CR> followed by other
		commands for establishing a data call (the DAC
		echoes all commands).
		Call disconnection (DAC):
		If the local DM user releases the call, the DAC
		turns DSR, DCD, and CTS OFF for 0.2 second
		and then ON.

553-3001-211 Standard 2.00 September 2004