Specifications

AN93
8 Rev. 0.9
Table 2. Modulations and Protocols*
Protocol Function Si2493 Si2457 Si2434 Si2415 Si2404
V.44 Compression
D
V.42bis Compression DDDDD
V.42 Error Correction DDDDD
MNP5 Compression
DDDD
MNP2-4 Error Correction
DDDDD
*Note: While the Si2493/57/34/15/04 family allows any supported protocol with any modulation, some other
manufacturers’ modems may not permit some combinations. This is particularly common with 300 bps modulations.
Table 3. Carriers and Tones
Specification Transmit Carrier
(Hz)
Receive Carrier
(Hz)
Answer
Tone (Hz)
Carrier Detect (Acquire/
Release)
V.92 Variable Variable per ITU-T V.92
V.90 Variable Variable per ITU-T V.90
V.34 Variable Variable per ITU-T V.34
V.32bis 1800 1800 2100 per ITU-T V.32bis
V.32 1800 1800 2100 per ITU-T V.32
V.29 1700 1700 per ITU-T V.29
V.22bis, V.22
Originate
Answer
1200
2400
2400
1200
2100
–43 dBm/–48 dBm
–43 dBm/–48 dBm
V.21
Originate (M/S)
Answer (M/S)
1180/980
1850/1650
1850/1650
1180/980
2100
–43 dBm/–48 dBm
–43 dBm/–48 dBm
Bell212A
Originate
Answer
1200
2400
2400
1200
2225
–43 dBm/–48 dBm
–43 dBm/–48 dBm
Bell103
Originate (M/S)
Answer (M/S)
1270/1070
2225/2025
2225/2025
1270/1070
2225
–43 dBm/–48 dBm
–43 dBm/–48 dBm