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DIALING/COMMUNICATION CONTROL
3 - 3
3
3.2 Signaling System Diagram and Signal Forms
3.2.1 Circuit control signals
The following circuit control signals are used in the binary and tonal procedures.
• Circuit control signals
*1: This signal can be sent manually.
• Signal form
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)
Signal name Signal form Signal form
CED f: 2100 ±15 Hz
t: 2.6 - 4.0 sec
CNG f: 1100 ±38 Hz
t: 0.5 sec ±15%
(L: 3 sec)
f
t
f
t
f
t
L