Call Progress Tone Detector

MX643 - Preliminary Information

© 1996 MX•COM, INC.

Tele: 800 638 5577, 910 744 5050, Fax: 910 744 5054

Doc. #20480148.001

9

Timing Characteristics

For the following conditions unless otherwise specified:

Notes

Min.

Typ.

Max.

Units

Burst Length Ignored

1

70

ms

Burst Length Detected

1

145

ms

Call Progress Tone Gap Length Ignored

1, 2

20

ms

Call Progress Tone Gap Length Detected

1, 2

40

ms

Call Progress Tone Response Time

1

145

ms

Call Progress Tone De-response Time

1

145

ms

Gap Detected Recorded

1, 3

6

ms

Non Call Progress Signal Gap Length Ignored

4

80

ms

Non Call Progress Signal Response Time

145

ms

Non Call Progress signal De-response Time

80

ms

State Change

0

ms

DETECT1, DETECT2, and DETECT3 Response

Time

5

145

ms

Timing Notes:

1. Timings also apply to Special Information Tone.

2. Only applies to bursts of the same frequency.

3. To acknowledge a short tone gap

≥ 40 ms, No Signal is indicated for a minimum of 6ms.

4. If the gap > 90 ms, a No Signal state will be decoded.

5. Time between a stable XTAL/CLK and a valid DETECT1, DETECT2, and DETECT3 state when

ENABLE is logic high..

Timing Diagrams

SIGIN

DETECT1

ENABLE

No Signal

Call Progress

Low Band

Call Progress

High Band

Call Progress

High Band

Call Progress

High Band

DETECT2

Note: DETECT3 is logic high only when the Call Progress Signal, or the Non Call Progress Signal is a single frequency tone.

DETECT3

Figure 3: Timing Diagram: Call Progress Tone(s)