The fax and modem decoding features depends on three software modules which analyze one or two incoming bit streams (calling and answering modems) in G.711 format (8 kHz sampling rate, A- or mu-law) or a 16 bit linear format.

The first module analyzes the initial handshakes to route the bit stream(s) to the appropriate demodulation modules – fax or full-duplex data - of the next stage.

The next module demodulates the signal, and echo cancellation is applied if in use.

The last module processes fax ECM (Error Correction Mode) as well as performing data link layer analysis on data signals. The various fax and data modes are then decoded and output in a number of formats.

Capabilities

The decoder capabilities encompass the modulation types and protocols listed below:

Modulation types

Protocols