r6781-12 Conexant Systems, Inc., r6781-12 Datasheet - Page 76

• Manufacturer Part Number: r6781-12
• Description: Embedded Modem Family
• Manufacturer: Conexant Systems, Inc.

6.5 Call Progress
6.5.1 Call Progress Algorithms
6-12
6.5 Call Progress
Data call progress algorithms measure the power and/or relative power of the
highband and lowband channels and determine signal presence and cadence
correlations. Highband channel signals include 2100 and 2225 Hz signalling
tones. Lowband channel signals include dial tones, busy tones, ringback tones and
voice ranging in frequency from 120 to 620 Hz.
Table
Table 6-4. Tone Characteristics
progress detection requirements are identical to the lowband data signals
identified above.
Dial Tone
Old Dial Tone
Busy
Old Busy
Precision Reorder
Old Reorder (local)
Old Reorder (toll)
Ringback
Old Ringback
Double Ringback
Characteristics of the tones detected by the RC224ATLV are listed in
Fax answer tone detection requirements include 2100 and 1100 Hz. The call
6-4.
Tone
Conexant
Continuous
Continuous
0.5 sec ON
0.5 sec OFF
0.5 sec ON
0.5 sec OFF
0.2 sec OFF
0.25 sec ON
0.25 sec OFF
0.3 sec OFF
0.8-1.2 sec ON
2.7-3.3 OFF
2 sec ON
4 sec OFF
0.3 sec ON
0.2 sec ON
0.3 sec OFF
0.8 sec ON
4 sec OFF
0.8 sec ON
Cadence
350 + 440
600+120/133
480 + 620
480 + 620
600 + 120
600 + 120
480 + 620
480 + 620
600 + 120
600 + 120
600 + 120
600 + 120
440 + 480
440 + 480
420 + 40
420 + 40
Frequency (Hz)
440 + 480
440 + 480
440 + 480
440 + 480
EmbeddedModem Family
D224ATLVDSC