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ADSL overview

Asymmetric digital subscriber line (ADSL) uses existing twisted pair telephone lines to create access paths for high-speed data communications and transmits at speeds up to 8.1Mbps to a subscriber. This article explains the basic function of ADSL transceivers and their modulation scheme.

PSpice Studio - advanced simulation solutions for analog and mixed-signal environments

A full-featured simulator for serious analog designers. Sophisticated, internal models allow you to simulate everything from high-frequency systems to low-power IC designs. Draw on the expansive library of models to create off-the-shelf parts, or create models for new devices. Fully explore the relationships in your design with "what if" scenarios before committing to final implementation.

AT commands set

This document provides an introduction to intelligent modems, the AT command set and the concepts behind many of the commands. The AT commands are used to configure the modem to your preferred operating mode and to instruct the modem to do what you want it to do.

Serial communication - the programming under Windows

This article describe how to create programmes working with hardware under Windows one should use API's funntions. Here is a few indispensable functions which you need to establish communication. For example funtions to open and close connection, set the connection parameters and functions used to read or write the information from/into the port.

Power over Ethernet - PoE, IEEE802.3af standard

Power-over-Ethernet (PoE) is an emerging new technology that enables delivery of data and power to internet appliances over existing CAT-5 Ethernet cables. PoE is rapidly gaining in popularity with manufacturers and end users of devices such as VoIP phones, wireless access points, security cameras and point-of-sale terminals. PoE is governed by the standards defined in the recently ratified IEEE802.3af standard.