Kamis, 24 September 2009

V.22bis/V.22 Modem Software

V.22bis and V.22 Software (Soft Modems V22bis and V22)

GAO's V.22 & V.22bis software modules implement the ITU-T standards for 1200 bps and 2400 bps full-duplex data communication on the GSTN and on point-to-point 2 wire leased line circuits. In these modems, channels are separated by frequency division and each channel is phase shift modulated. A symbol rate of 600 carries 2-bits per symbol for a rate of 1200 bps for V.22. For V.22bis, each channel is quadrature amplitude modulated (QAM) to carry 4-bits per symbol at 600 symbols per second for a rate of 2400 bps. Carrier frequencies are 1200 Hz and 2400 Hz for the low and high channels respectively.

Features of V.22/V.22bis Software (Soft Modems V22/V22bis)

  • Complies with ITU-T standards for V.22 & V.22bis.
  • Uses minimal memory and MIPS.
  • Does not require a high quality, high cost DAA or Codec.

For ITU-T standard on V.22bis, V.22, click ITU-T Standard: V.22bis, V.22.

For examples of GAO's Modem Software Architecture, click GAO's Modem Software Architecture.

For a complete list of GAO's Modem Software products, please see GAO's Softmodem List.

V.22bis and V.22 Software (Soft Modems V22bis and V22V.22bis/V.22 Product Sheet Printable PDF Version


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