V.90 Server – Digital modem with a maximum bit rate of 56 Kbps transmit, 33.6 Kbps receive.
V.90 Client – Analog modem with a maximum bit rate of 56 Kbps receive, 33.6 Kbps transmit.
PCM modulation in the downstream direction at the rate of 8000 symbols/s.
Channel separation by echo cancellation.
Synchronous data signaling rates in the downstream direction from 28000 bps to 56000 bps in increments of 8/6 Kbps.
V.34 modulation in the upstream direction.
Adaptive techniques are used so that the modems can achieve the maximum data signaling rates that the channel can support.
Negotiate full duplex V.34 operation if a connection doesn't support V.90 operation.
Automoding to V.series modems supported by V.32bis automode procedure.
Exchange of rate sequences during start up to establish the data signaling rate.
Uses V.8 procedure during modem start up or selection.
Advantages of Software Implementation
OEMs need to get their products to market quickly. They must also make sure these products are upgradable to any new versions of the ITU V.90 standard that
may be released. Hardware implementations of V.90 modems will be much more difficult to upgrade than software implementations. A software implementation on a DSP is not only upgradable; it also
allows multiple functions to run on one processor. This gives the designer flexibility in product design as well as a better cost/performance ratio. GAO Research offers quality modem code ready for
licensing providing a quick time-to-market.