CMX868E2 View Datasheet(PDF) - MX-COM Inc
Part Name
Description
MFG CO.
'CMX868E2' PDF : 43 Pages View PDF
Low Power V.22bis Modem
22
CMX868 Advance Information
Tx Mode Register b8-0: DTMF/Tones mode
If DTMF/Tones transmit mode has been selected (Tx Mode Register b15-12 = 0001) then b8-5 should
be set to 0000 and b4-0 will select a DTMF signal or a fixed tone or one of four programmed tones or
tone pairs for transmission.
b4 = 0: Tx fixed tone or programmed tone pair
Bit 3 Bit 2 Bit 1 Bit 0 Tone frequency (Hz)
0
0
0
0 No tone
0
0
0
1 697
0
0
1
0 770
0
0
1
1 852
0
1
0
0 941
0
1
0
1 1209
0
1
1
0 1336
0
1
1
1 1477
1
0
0
0 1633
1
0
0
1 1300
(Calling tone)
1
0
1
0 2100
(Answer tone)
1
0
1
1 2225
(Answer tone)
1
1
0
0 Tone pair TA
Programmed Tx tone or tone pair, see 1.5.10.8
1
1
0
1 Tone pair TB
“
1
1
1
0 Tone pair TC
“
1
1
1
1 Tone pair TD
“
b4 = 1: Tx DTMF
Bit 3 Bit 2 Bit 1
0
0
0
0
0
0
0
0
1
0
0
1
0
1
0
0
1
0
0
1
1
0
1
1
1
0
0
1
0
0
1
0
1
1
0
1
1
1
0
1
1
0
1
1
1
1
1
1
Bit 0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Low frequency (Hz)
941
697
697
697
770
770
770
852
852
852
941
941
941
697
770
852
High frequency (Hz)
1633
1209
1336
1477
1209
1336
1477
1209
1336
1477
1336
1209
1477
1633
1633
1633
Keypad symbol
D
1
2
3
4
5
6
7
8
9
0
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A
B
C
¤2001 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480205.007
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
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