CMX644AP4 Ver la hoja de datos (PDF) - MX-COM Inc

Número de pieza

componentes Descripción

Lista de partido

CMX644AP4

Bell 212A and V.22 Modem with Call Progress and DTMF

MX-COM Inc  

Bell 212A / V.22 Modem with Call Progress and DTMF

11

CMX644A Preliminary Information

4.3.2.3 TX TONES Register ($E1)

This register is used to transmit both DTMF and modem progress tones.

TONESEL

(Bit 7)

TONE/NOTONE

(Bit 6)

DTMF/MODEM TONES

(Bit 5)

DTMF/SNGL

(Bit 4)

This bit selects the “Answer Tone” frequency in the receive detector. A ‘0’

selects 2225Hz and a ‘1’ selects 2100Hz.

This bit should be used to begin and end the transmission of tones once the

required frequency has been programmed. When set to ‘1’ the tone will be

transmitted; when set to ‘0’ a Notone (Bias Voltage) will be generated.

When this bit is set to ‘1’ the device is configured for DTMF. When it is set to ‘0’

the device is configured to transmit modem progress tones.

For normal DTMF operation this bit should be set to ‘0’. For test purposes it can

be set to ‘1’ in order to select the tone frequencies individually.

Table 8: TX TONES Register ($E1)

The following table shows the settings required for transmitting DTMF (Bit 5 should be set to ‘1’. Bits 6 and 7

should be operated as described above).

D3 D2 D1 D0

Lower Freq. (Hz)

(setting Bit 4 = 0)

Upper Freq. (Hz)

(setting Bit 4 = 0)

Keypad

symbol

0000

941

1633

D

0001

697

1209

1

0010

697

1336

2

0011

697

1477

3

0100

770

1209

4

0101

770

1336

5

0110

770

1477

6

0111

852

1209

7

1000

852

1336

8

1001

852

1477

9

1010

941

1336

0

1011

941

1209

*

1100

941

1477

#

1101

697

1633

A

1110

770

1633

B

1111

852

1633

C

Table 9: DTMF Tx settings

Single Tone Freq. (Hz)

(setting Bit 4 = 1)

1633

1209

1336

1477

1209

1336

1477

1209

852

852

941

941

941

697

770

852

The following table shows the settings required for transmitting modem progress tones. (Set Bit 4 to ‘0’ and

Bit 5 to ‘0’. Bits 6 and 7 should be operated as described earlier).

D3 D2 D1 D0 Frequency (Hz) Tone Description

0000

550

Guard

0001

1300

Calling

0010

1800

Guard

0011

2100

Answer

0100

2225

Answer

Table 10: Modem progress Tx tones settings

2000 MX-COM, Inc.

www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054

Doc. # 20480197.006

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

Share Link: