6.0 Operation
RC224ATL/224ATLV
6.5 Call Progress
EmbeddedModem Family
6.5 Call Progress
6.5.1 Call Progress Algorithms
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.
Characteristics of the tones detected by the RC224ATLV are listed in
Table 6-4.
Table 6-4. Tone Characteristics
Tone
Cadence
Continuous
Frequency (Hz)
Dial Tone
350 + 440
Old Dial Tone
Busy
Continuous
600+120/133
0.5 sec ON
0.5 sec OFF
480 + 620
480 + 620
Old Busy
0.5 sec ON
0.5 sec OFF
600 + 120
600 + 120
Precision Reorder
Old Reorder (local)
Old Reorder (toll)
Ringback
0.3 sec ON
0.2 sec OFF
480 + 620
480 + 620
0.25 sec ON
0.25 sec OFF
600 + 120
600 + 120
0.2 sec ON
0.3 sec OFF
600 + 120
600 + 120
0.8-1.2 sec ON
2.7-3.3 OFF
440 + 480
440 + 480
Old Ringback
2 sec ON
4 sec OFF
420 + 40
420 + 40
Double Ringback
0.8 sec ON
0.3 sec OFF
0.8 sec ON
4 sec OFF
440 + 480
440 + 480
440 + 480
440 + 480
Fax answer tone detection requirements include 2100 and 1100 Hz. The call
progress detection requirements are identical to the lowband data signals
identified above.
6-12
Conexant
D224ATLVDSC
CONEXANT [ CONEXANT SYSTEMS, INC ]
