Nortel Networks 553-3001-211 manual Inbound Gateway connection protocol

Page 452 of 894 NT7D16 Data Access card

Table 153

Connect and disconnect protocol (Part 4 of 12)

Mode of
operation	Interface application	Comments
Mode 3	Inbound Hotline modem	Inbound Hotline modem pooling:
	pools (with forced DTR)	The DAC operation is identical to mode 1 except
	Use this mode with Hayes	that DTR is always forced ON (except during
	1200 modem.	disconnect).
		Call disconnection:
		Disconnection is identical to mode 2.
Mode 4	Inbound and Outbound	Inbound Gateway connection protocol:
	Gateway access	Gateway raises DCD to initiate connection.
		DAC responds by driving DTR ON.
		Gateway does not have to turn DSR ON.
		However, toggling DSR or DCD from ON to OFF
		causes the DAC to disconnect the call.
		Gateway user sends <CR> to the DAC.
		DAC autobauds and sends the initial prompt to
		the Gateway.
		Outbound Gateway connection protocol:
		Local DM user calls the DAC that is connected to
		a Gateway.
		DAC answers the data call and drives DTR ON.
		Gateway receives DTR and prepares to receive
		commands.
		Local DM user is now transparently connected to
		the Gateway.
		Gateway is expected to drive DCD ON within 35
		seconds. If the Gateway fails to do so, the DAC
		drops DTR and the call.

553-3001-211 Standard 2.00 September 2004