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DSL modems are second only to cable as the leading high-speed Internet connectivity source. While DSL has been criticized for slow connection speeds and even slower download speeds, DSL has remained very competitive in the Internet service provider market, in part to its lower cost and continued success in customer service. more »
DSL and ADSL modems are transceiver devices that assist in the connection of a router or a single computer to a DSL phone line so that the consumer can use an ADSL service. DSL modems are also referred to as ATU-R, Network termination broadband adapters, network termination broad band access (NTBBA) in some countries or simply DSL... more »
When it comes to satellite modems, there is a broad range to choose from. They range from very inexpensive satellite modems to obtain home Internet access to costly multipurpose modem devices and machinery for commercial use.
The word modem means modulator or demodulator. Satellite modems transform and receive an input bit stream... more »
If you've signed up for AT&T DSL service, the company will probably give you a modem for free. Taking the free modem will be the best choice for most home and small business users. However, if AT&T's free modems don't have the features you want, purchasing your own modem has several advantages. more »
Cable modems are used to get clearer TV signals and faster Internet service. They also provide many more channels to choose from. Compared to asymmetrical digital subscriber lines (ASDL), cable modems generally offer much faster service. Both cable television and the Internet can be received from one coaxial cable. more »
If you have been using a dial-up Internet connection and are looking for something faster,...
For those who grew up tinkering with computers, audio equipment, and anything else with a...
Modems (derived from the terms modulator/demodulator) are devices that allow the connection of one computer to another computer using normal... more »
A modem is a communication device that changes or modifies an analog signal so that it can be transmitted to another communication device or... more »
Wireless modems have gone through many changes since their first introduction in the late1990s. Many different types of equipment can be used as a... more »
Modem is a shortened word used in place of modulator-demodulator. It is a conversion device that allows digital information to travel over analog... more »
DSL modems are commonly used in homes and some businesses to access the Internet. A DSL modem is faster than a dial-up connection and typically... more »
A modem (modulator-demodulator) is a device that modulates an analog carrier signal to encode digital information, and also demodulates such a carrier signal to decode the transmitted information. The goal is to produce a signal that can be transmitted easily and decoded to reproduce the original digital data. Modems can be used over any means of transmitting analog signals, from driven diodes to radio.
The most familiar example is a voiceband modem that turns the digital 1s and 0s of a personal computer into sounds that can be transmitted over the telephone lines of plain old telephone services (POTS), and once received on the other side, converts those 1s and 0s back into a form used by a USB, Ethernet, serial, or network connection.
Modems are generally classified by the amount of data they can send in a given time, normally measured in bits per second (bit/s, or bps). They can also be classified by Baud, the number of times the modem changes its signal state per second. For example, the ITU V.21 standard used audio frequency-shift keying, aka tones, to carry 300 bit/s using 300 baud, whereas the original ITU V.22 standard allowed 1,200 bit/s with 600 baud using phase-shift keying.
Faster modems are used by Internet users every day, notably cable modems and ADSL modems. In telecommunications, wide-band radio modems transmit repeating frames of data at very high data rates over microwave radio links. Narrow-band radio modem is used for low data rate up to 19.2k mainly for private radio networks. Some microwave modems transmit more than a hundred million bits per second. Optical modems transmit data over optical fibers. Most intercontinental data links now use optical modems transmitting over undersea optical fibers. Optical modems routinely have data rates in excess of a billion (1x109) bits per second. One kilobit per second (kbit/s, kb/s, or kbps) as used in this article means 1,000 bits per second and not 1,024 bits per read more at » http://en.wikipedia.org/wiki/Modem
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