56K V.92 Data, Fax, and Voice Chipset

Table 6-1. Voice Mode Command Descriptions (Continued)

Compression Method Selection: (cont.)

Transmission: Range: n = 0

n = 0*

Disabled

When receiving voice, this parameter changes the level of noise that the DCE treats as silence. A higher “n” number raises the threshold of noise detection.

Reception: Range: n = 0

 

n = 0*

Disables DCE silence compression

n =increments of 1

Raises noise detection threshold

+VSM=m

manufac-

<sel> Silence Expansion: This command enables the DTE to modify the amount of silence expansion. This parameter represents the maximum period of silence the DCE expands a period of silence compressed by the <scs> parame- ter. The DCE ignores the <sel> parameter if <scs> is zero.

<cml>

<vsr>

Serial

UART

Hard Disk

 

Sampling

Data Rate

Data Rate

Note

Compression

(Bytes/sec.)

Rate

(bps)

(bps)

 

 

 

 

<cml> = CL1*

4800

48,000

57,600

4800

 

 

7200

72,000

115,200

7200

1

 

8000

80,000

115,200

8000

1

 

9600

96,000

115,200

9600

1

 

11025

110,250

115,200

11,025

1

(cont.)

turer-

<cml> = AD3

4800

18,000

19,200

1800

specified

 

7200

27,000

38,400

2700

 

 

8000

30,000

38,400

3000

 

 

9600

36,000

38,400

3600

 

 

11025

41,344

57,600

4135

 

<cml> = AD4

4800

24,000

38,400

2400

 

 

7200

36,000

38,400

3600

 

 

8000

40,000

57,600

4800

 

 

9600

48,000

57,600

4800

 

 

11025

55,125

57,600

5513

 

<cml> = LIN1

4800

48,000

57,600

4800

 

 

7200

72,000

115,200

7200

1

 

8000

80,000

115,200

8000

1

 

9600

96,000

115,200

9600

1

 

11,025

110,250

115,200

11,025

1

<cml> = LIN2

4800

96,000

115,200

9600

1

NOTES:

1)Because of the high UART data rates, these compression/sample rates may not be applicable to the serial host interface (that is, serial box modem) designs (see ATI5 to determine if the modem is using the serial host inter- face). For parallel and PC Card host interfaces, the modem ignores the UART data rate.

2)DTMF detection is provided for all sample rates.

Programmer’s Guide

Intel Confidential

95

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Intel MD566X manual Compression Method Selection, +VSM=m Manufac, Vsr, Hard Disk, Compression Bytes/sec Rate Bps, Turer