Nortel Networks 553-3001-211 manual Call disconnection Gateway, Inbound Hotline Gateway protocol

NT7D16 Data Access card Page 453 of 894

Table 153

Connect and disconnect protocol (Part 5 of 12)

Mode of
operation	Interface application	Comments
		Call disconnection (DAC):
		DAC drops DTR if the local DM user drops the
		call. The Gateway must drop DCD.
		DAC drops DTR if the DAC receives a long break
		or three short breaks. The Gateway must drop
		DCD.
		Call disconnection (Gateway):
		Gateway drops DCD (DCD OFF for 100 ms or
		more). The DAC drops DTR and disconnects the
		local call.
		Gateway drops DSR (DSR OFF for 100 ms or
		more). The DAC drops DTR and disconnects the
		local call.
Mode 5	Inbound Hotline Gateway	Inbound Hotline Gateway protocol:
	access	Gateway raises DCD to initiate connection.
		DAC responds by trying to establish a Hotline call
		to a specific Data Module (Autodial).
		When Data Module answers, then and only then,
		the DAC turns DTR ON.
		Gateway does not have to turn DSR ON.
		However, toggling DSR or DCD from ON to OFF
		causes the DAC to drop the call.
		Gateway is not transparently linked to the
		equipment connection to the DM.
		Call disconnection:
		Disconnection is identical to mode 4.

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