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Modem Data Pump DSP Software

The following telephone line modem data pumps 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 (click for data sheet) 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 3.1 0.06 0.6kwords 0.3 Full 5.0
C code 4.5 0.04 1.5kbytes
Bell 202 asm code 2.4 0.05 0.5kwords 1.8 Full(4wire)
/Half

12.0(1.2kb/s)

C code 4.5 0.04 1.4kbytes
Bell 212(A) asm code 3.6 0.24 3.0kwords3 1.2 Full 6.5(1.2kb/s)
C code 5.5 0.22 10.1kbytes3
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 4.6 0.13 1.1kwords4 0.3 Full 5.0
C code 6.4 0.11 3.4kbytes4
V.17 asm code 5.3 0.47 3.8kwords 14.4 Half 22.0
C code 12.8 0.43 12.0kbytes
V.21 asm code 3.1 0.06 0.6kwords 0.3 Full 5.0
C code 4.5 0.04 1.5kbytes
V.22bis(V.22) asm code 3.5 0.24 2.6kwords5 2.4 Full 13.5
C code 5.7 0.22 9.6kbytes5
V.23 asm code 2.5 0.05 0.5kwords 1.2 Full 12.5
C code 4.5 0.04 1.5kbytes
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 3.2 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 3.16 5.8kwords5 14.4 Full 22.0
C code 17.4 3.16 20.5kbytes5
V.33 asm code 5.3 0.47 3.8kwords 14.4 Full(4wire)
22.0
C code 12.9 0.43 11.6kbytes
V.34 asm code 19.9 7.96 12.0kwords7 33.6 Full/Half 34.0
C code 38.9 7.96 40.8kbytes7
V.428 asm code 2.5 1.2 1.5kwords any Full n/a
C code 4.8 1.2 4.9kbytes
V.61 asm code 14.9 6.46 6.0kwords 14.49 Full 26.0
C code 33.5 6.36 23.1kbytes

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.22 and Bell 103 code
4 includes V.21 code
5
includes (V.54) Remote Digital Loop
6 covers round-trip delays of up to 1.3secs
7 full-duplex only but including V.8
8 HDLC error correction - figures for 33.6kb/s full-duplex data with REJ-only frame rejection
9 includes an audio + 4.8kb/s data mode

 
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