Specifications

Si2404
12 Rev. 0.91
Table 7. Protocol Characteristics
Item Specification
Data Rate
2400 bps
1200 bps
300 bps
300 bps
ITU-T V.22bis
ITU-T V.22bis, V.23, or Bell 212A
ITU-T V.21
Bell 103
Data Format
Bit asynchronous
Selectable 8, 9, 10, or 11 bits per character
Compatibility V.23, V.22bis, V.22, V.21, Bell 212A, and Bell 103
Operating Mode
Switched network
Two-wire full-duplex
Data Modulation
2400 bps
1200 bps
0 to 300 bps
16-level QAM/600 Baud ±0.01%
4-level PSK/600 Baud ±0.01%
FSK 0–300 Baud ±0.01%
Answer Tone
ITU-T V.22bis, V.22, and V.21 modes
Bell 212A and 103 modes
2100 Hz ±3 Hz
2225 Hz ±3 Hz
Transmit Carrier
ITU-T V.22, V.22bis/Bell 212A
Originate mode
Answer mode
ITU-T V.21
Originate mode
Answer mode
Bell 103
Originate mode
Answer mode
1200 Hz ±0.5 Hz
2400 Hz ±1 Hz
Mark (980 Hz ±12 Hz) Space (1180 Hz ±12 Hz)
Mark (1650Hz ±12Hz) Space (1850Hz ±12Hz)
Mark (1270Hz ±12Hz) Space (1070Hz ±12Hz)
Mark (2225Hz ±12Hz) Space (2025Hz ±12Hz)
Output Level
Permissive—Switched network
–9 dBm maximum
Receive Carrier
ITU-T V.22, V.22bis/Bell 212A
Originate mode
Answer mode
ITU-T V.21
Originate mode
Answer mode
Bell 103
Originate mode
Answer mode
2400 Hz ±7 Hz
1200 Hz ±7 Hz
Mark (1850Hz ±12Hz) Space (1650Hz ±12Hz)
Mark (1850Hz ±12Hz) Space (1650Hz ±12Hz)
Mark (2225Hz ±12Hz) Space (2025Hz ±12Hz)
Mark (1270Hz ±12Hz) Space (1070Hz ±12Hz)