Chapter 8 System Performance
Audible Tones and Ringing Signal
NEAX2000 IVS
2
General Description
NDA-24293, Issue 2
Page 81
Audible Tones and Ringing Signal
Audible Tones
Ringing Signal
Frequency:
20 Hz (Nominal)
Signal Voltage:
75 Vrms (Nominal)
Interruption:
•
2 sec. ON,
4 sec. OFF (for external call)
•
1 sec. ON and
2 sec. OFF (for internal call)
Built-In Modem on MP Card
MODEM:
33.6 kbps
Table 8-1 Specifications of Audible Tone
TONE
FREQUENCY
INTERRUPTION
Dial Tone (DT)
350 Hz mixed with 440 Hz
Continuous
Special Dial Tone (SDT)
350 Hz mixed with 440 Hz
0.125 sec. ON, 0.125 sec. OFF
Busy Tone (BT)
480 Hz mixed with 620 Hz
0.5 sec. ON, 0.5 sec. OFF
Reorder Tone (ROT)
480 Hz mixed with 620 Hz
2.5 sec. ON, 0.25 sec. OFF
Howler Tone (HWT)
2,400 Hz interrupted by 16 Hz
Continuous
Service Set Tone (SST)
350 Hz mixed with 440 Hz
Continuous
Ring Back Tone (RBT)
440 Hz mixed with 480 Hz
1 sec. ON, 3 sec. OFF
Hold Tone (HDT)
480 Hz mixed with 620 Hz
0.25 sec. ON, 0.25 sec. OFF 0.25
sec. ON, 1.25 sec. OFF
Second Dial Tone
440 Hz mixed with 480 Hz
0.25 sec. ON, 0.25 sec. OFF 0.25
sec. ON, 1.25 sec. OFF
Call Waiting Ring Back Tone
440 Hz mixed with 480 Hz
1 sec. ON, 1 sec. OFF