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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)
/Half

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 asm code, MIPS and ProgMem (in 16-bit words) values are from TMS320C54x DSP assembling
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

 
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