Toshiba GD-1260, GD-1250 Signaling System Diagram and Signal Forms, Circuit control signals

3.2Signaling System Diagram and Signal Forms

3.2.1Circuit control signals

The following circuit control signals are used in the binary and tonal procedures.

•Circuit control signals

CED	Called station identification
	Indicates that the sender is a FAX machine in the automatic called
	mode. (*1)
CNG	Calling tone
	Indicates that the sender is a FAX machine in the automatic calling
	mode. (*1)

*1: This signal can be sent manually.

• Signal form

Signal name	Signal form			Signal form
CED				f: 2100 ±15 Hz
		f		t: 2.6 - 4.0 sec
		t
CNG				f: 1100 ±38 Hz
	f		f	t: 0.5 sec ±15%
				(L: 3 sec)
		L
	t		t

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