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Software for Telecoms & Audio
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Modem Data Pump DSP Software
The following telephone line modems are implemented. Click on "asm code"# or "C code" of the desired modem to view a data sheet (# shorthand for TMS320C5000 DSP assembler code).
| Modem | Code type | Processor MIPS1 | Processor Data Mem (kwords)1 | Processor Prog Mem1 | Max kb/s | Duplex mode | SNR for 10-6 BER (dBs)2 |
| Bell 103 | asm code | 3.2 | 0.06 | 0.6kwords | 0.3 | Full | 5.0 |
| C code | 4.4 | 0.05 | 1.7kbytes | ||||
| Bell 202 | asm code | 2.7 | 0.05 | 0.5kwords | 1.8 | Full(4wire) /Half |
12.0(1.2kb/s) |
| C code | 4.8 | 0.04 | 1.6kbytes | ||||
| R.3X(R.38etc) | asm code | 2.0 | 0.05 | 0.6kwords | 0.2 | Full | 4.0 |
| C code | 4.2 | 0.04 | 1.8kbytes | ||||
| V.8 | asm code | 4.7 | 0.13 | 1.2kwords3 | 0.3 | Full | 5.0 |
| C code | 6.3 | 0.11 | 3.5kbytes3 | ||||
| V.17 | asm code | 5.4 | 0.47 | 3.8kwords | 14.4 | Half | 22.0 |
| C code | 12.8 | 0.43 | 12.0kbytes | ||||
| V.21 | asm code | 3.2 | 0.06 | 0.6kwords | 0.3 | Full | 5.0 |
| C code | 4.4 | 0.05 | 1.7kbytes | ||||
| V.22bis(V.22) | asm code | 3.5 | 0.24 | 2.6kwords4 | 2.4 | Full | 13.5 |
| C code | 5.7 | 0.22 | 9.6kbytes4 | ||||
| V.23 | asm code | 2.7 | 0.05 | 0.5kwords | 1.2 | Full | 12.5 |
| C code | 4.7 | 0.04 | 1.6kbytes | ||||
| Modem | Code type | Processor MIPS1 | Processor Data Mem (kwords)1 | Processor Prog Mem1 | Max kb/s | Duplex mode | SNR for 10-6 BER (dBs)2 |
| V.25 | asm code | 1.7 | 0.05 | 0.3kwords | n/a | n/a | n/a |
| C code | 2.8 | 0.02 | 0.9kbytes | ||||
| V.26bis | asm code | 1.8 | 0.17 | 1.7kwords | 2.4 |
Full(4wire) |
8.5 |
| C code | 4.0 | 0.15 | 5.3kbytes | ||||
| V.27bis/ter | asm code | 3.3 | 0.26 | 2.5kwords | 4.8 | Full(4wire) /Half |
15.5 |
| C code | 6.8 | 0.24 | 8.4kbytes | ||||
| V.29 | asm code | 3.7 | 0.25 | 2.1kwords | 9.6 | Full(4wire) /Half |
20.0 |
| C code | 7.2 | 0.24 | 7.2kbytes | ||||
| V.32bis(V.32) | asm code | 7.9 | 3.15 | 5.8kwords4 | 14.4 | Full | 22.0 |
| C code | 17.4 | 3.15 | 20.5kbytes4 | ||||
| V.33 | asm code | 5.4 | 0.47 | 3.8kwords | 14.4 | Full(4wire) |
22.0 |
| C code | 12.9 | 0.43 | 11.6kbytes | ||||
| V.34 | asm code | 19.9 | 7.95 | 12.1kwords6 | 33.6 | Full/Half | 34.0 |
| C code | 38.9 | 7.95 | 40.9kbytes6 | ||||
| V.42 | asm code | 2.77 | 1.3 | 1.7kwords | any | Full | n/a |
| V.61 | asm code | 14.9 | 6.45 | 6.0kwords | 14.48 | Full | 26.0 |
| C code | 33.5 | 6.35 | 23.1kbytes | ||||
| Modem | Code type | Processor MIPS1 | Processor Data Mem (kwords)1 | Processor Prog Mem1 | Max kb/s | Duplex mode | SNR for 10-6 BER (dBs)2 |
1
with C code MIPS and ProgMem (in 8-bit bytes) values are from
TMS320C55x DSP compiling
1
all figures for 8.0kHz sample rate without backwards channel if applicable
2
SNR figures for flat channel with 4.0kHz bandwidth noise
3
includes V.21 code
4
includes (V.54) Remote Digital Loop
5
covers round-trip delays of up to 1.3secs
6
full-duplex only but including V.8
7
at 33.6kb/s
8
includes an audio + 4.8kb/s data mode
