WAVECOM Decoder W74PC, W-PCI/e, W-CODE, W-CLOUD Manual V9.1.0 Modem and FAX Modes
313
User Input
Transmission
Format
Trellis coded
128/64/32/
16QAM
Down: PCM, digital
Up: V.32 analogue
Down: PCM, digital
Up: V.32, ana-
logue.
“Internet call wait-
ing”
Decoding
The fax and modem decoding features depends on three software modules which analyze one or two in-
coming 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 demodula-
tion 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.
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