B Technical Specifications
| Data Modulation | FSK at 300 bps |
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| PSK at 1200 bps |
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| QAM at 2400, 4800, and 9600 bps | ||
| QAM with | ||
| 14,400; 16,800; 19,200; 21,600; 24,000; 26,400; 28,800; | ||
| 31,200; 33,600; 34,000; 38,000; 46,000, 54,000 and | ||
| 56,000 bps |
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| Fax Modulation | V.21 CH2 FSK at 300 bps (half duplex) | ||
| V.27ter DPSK at 4800 and 2400 bps | ||
| V.29 QAM at 9600 and 7200 bps | ||
| V.17TCM at 14400, 12000, 9600, and 7200 bps | ||
| Carrier Frequencies | 1600, 1646, 1680, 1800, 1829, 1867, 1920, 1959, 2000 Hz | ||
V.34 |
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Carrier Frequencies | 1800 Hz |
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| V.32, V.32bis, V.32terbo |
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Carrier Frequencies | Transmit originate: 1200 | Hz | |
| V.22,V.22bis or | Transmit answer: | 2400 | Hz |
| Bell 212A Standard | Receive originate: | 2400 | Hz |
| (2400 &1200 bps) | Receive answer: | 1200 | Hz |
Carrier Frequencies | Transmit originate: | 390 | Hz mark |
| V.23 (1200 bps) |
| 450 | Hz space |
| Receive originate: | 1300 | Hz mark |
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| 2100 | Hz space |
| Transmit answer: | 1300 | Hz mark |
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| 2100 | Hz space |
| Receive answer: | 390 | Hz mark |
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| 450 | Hz space |
Carrier Frequencies | Transmit originate: | 980 | Hz mark |
| V.21 |
| 1180 | Hz space |
| Receive originate: | 1650 | Hz mark |
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| 1850 | Hz space |
| Transmit answer: | 1650 | Hz mark |
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| 1850 | Hz space |
| Receive answer: | 980 | Hz mark |
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| 1180 | Hz space |
Carrier Frequencies | Transmit originate: 1270 | Hz mark | |
| Bell 103/113 |
| 1070 | Hz space |
Receive originate: | 2225 | Hz mark | |
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| 2025 | Hz space |
| Transmit answer: | 2225 | Hz mark |
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| 2025 | Hz space |
| Receive answer: | 1270 | Hz mark |
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| 1070 | Hz space |
| Fax Carrier | V.21 Ch2 (half duplex): |
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| Frequencies | 1650 Hz mark, 1850 Hz space for transmit originate | ||
| 1650 Hz mark, 1850 Hz space for transmit answer | ||
| V.27ter: 1800 Hz originate/answer | ||
| V.29 QAM: 1800 Hz originate/answer | ||
| V.17 TCM: 1800 Hz originate/answer | ||
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