Jaton Communicator V.90, Руководство пользователя

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CHAPTER 4 TROUBLE SHOOTING
Modem Basic
This chapter will address some basic terminology associated with your
modem and with your communications software.
MODEM
Modem is an abbreviation of Modulator and DEModulator. It is use for
computer communication. Modem translates computer data to analog signal
(modulation) that can travels through the telephone network and reaches
the other modem. The remote modem translates the analog signal received
back to data (demodulation) and sends to the receiving end computer.
FAX MODEM
Most modem device designed to have the fax transmitting (or and)
receiving function(s).
VOICE MODEM
Modem with digitized voice capability can digitize the incoming voice
message and the computer can store it as a file. The voice modem can also
playback a recorded digital voice message either locally or to the line as an
announcement.
DTE / DCE
DTE stands for Data Terminal Equipment and DCE stands for Data
Communication Equipment. The Computer or terminal is the DTE and the
modem is the DCE.
DSP
Digital Signal Processor. It performs all digital signal processing functions
for the chipset, such as modulation schemes and modem handshakes.
UART
UART (Universal Asynchronous Receiver Transmitter) is the device used in
DTE or DCE for asynchronous data receiving and transmitting. The normal
UART device used in PC is NS16450. For high-speed serial data receiving