r6781-12 Conexant Systems, Inc., r6781-12 Datasheet - Page 10

• Manufacturer Part Number: r6781-12
• Description: Embedded Modem Family
• Manufacturer: Conexant Systems, Inc.

1.2 Technical Specifications
1.2.2 Configurations and Rates
Table 1-1. Configurations and Rates
1-2
Data Mode
Fax Mode
Configuration
V.22 bis
V.22
Bell 212A
Bell 103
V.29
V.27 ter
V.21
Legend:
QAM
DPSK
FSK
M
S
N/A
QAM
DPSK
DPSK
FSK
QAM
QAM
DPSK
DPSK
FSK
Modulation
Quadrature Amplitude Modulation
Differential Phase Shift Keying
Frequency Shift Keying
Mark condition
Space Condition
Not Applicable
The supported modem configurations and signaling rates are listed in
In data modes with serial interface selected, DTE rate offsets of + 1%, – 2.5% are
accommodated by adding/deleting stop bits as required. In fax modes, the DTE
rate is 19,200 bps.
Answer
2400
2400
2400
2225 M
2025 S
Receive
N/A
N/A
1800
1800
1650 M
1850 S
Frequency (Hz)
Transmitter Carrier
Originate
1200
1200
1200
1270 M
1070 S
Transmit
1700
1700
1800
1800
1650 M
1850 S
±
0.01%
Conexant
Data Rate
(bps)
2400
1200
1200
9600
7200
4800
2400
300
300
(Symbols/Sec.)
Baud
2400
2400
1600
1200
600
600
600
300
300
EmbeddedModem Family
Bits Per
Symbol
4
2
2
1
4
3
3
2
1
D224ATLVDSC
Constellation
Table
Points
16
16
4
4
1
8
8
4
1
1-1.