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Topic: Modem


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  What is modem? - A Word Definition From the Webopedia Computer Dictionary
A modem is a device or program that enables a computer to transmit data over, for example, telephone or cable lines.
While the modem interfaces are standardized, a number of different protocols for formatting data to be transmitted over telephone lines exist.
Modems that support a voice/data switch have a built-in loudspeaker and microphone for voice communication.
www.webopedia.com /TERM/m/modem.html   (1295 words)

  
  Modem - Wikipedia, the free encyclopedia
A modem (a portmanteau word constructed from modulator and 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.
Modems are generally classified by the amount of data they can send in a given time, normally measured in bits per second, or "bps".
Modems in the United States were first introduced as a part of the SAGE air-defense system in the 1950s, connecting terminals located at various airbases, radar sites and command-and-control centers to the SAGE director centers scattered around the US and Canada.
en.wikipedia.org /wiki/Modem   (5557 words)

  
 LEARN THE NET: All About Modems
Modems were invented to convert digital computer signals into a form that allows them to travel over phone lines.
A modem on the other end of the line understands it and converts the sounds back to digital information that the computer understands.
A 56 Kbps modem is twice as fast, sending and receiving data at a rate of up to 56,000 bits per second.
www.learnthenet.com /english/html/05modems.htm   (395 words)

  
 Modem   (Site not responding. Last check: )
Short haul modems can also be used, even if the end-to-end length of the direct connection is longer than 15 km, when both ends of the line are served by the same central office in the telephone system.
In the earliest modems, digital signals were converted to analog by transmitting a large amplitude sine wave for a "1" and zero amplitude for a "0", as shown in figure Modem-3.
In this method, the modem shifts the phase of each succeeding signal in a certain number of degrees for a "0" (90 degrees for example) and a different certain number of degrees for a "1" (270 degrees for example) as illustrated in figure Modem-6.
www2.rad.com /networks/1994/modems/modem.htm   (4533 words)

  
 modem definition - isp.webopedia.com - The Glossary for Internet Service Providers
A modem is a device or program that enables a computer to transmit data over, for example, telephone or cable lines.
While the modem interfaces are standardized, a number of different protocols for formatting data to be transmitted over telephone lines exist.
However, the modem at the receiving end must be able to decompress the data using the same compression technique.
isp.webopedia.com /TERM/m/modem.html   (898 words)

  
 Modem Connection When Travelling - Asiaspirit
Modem with special socket requires a cable with a special plug.
A modem can't do direct dialing with a 4 wires (office telephone) cable as an outside line (dial tone) has first to be obtained from the "telephone central control box", it is done with the 3rd and 4th wires.
In some countries, the line wires are connected to the outside connectors instead of the two middle connectors, direct connection to a modem is not possible.
www.asiaspirit.com /modem-wi.htm   (672 words)

  
 external modem - Hutchinson encyclopedia article about external modem   (Site not responding. Last check: )
In computing, a modem that is a self-contained unit sitting outside a personal computer (PC) and connected to it by a cable.
External modems have the advantage over internal ones in that they are easy to move from computer to computer as needed.
However, high-speed modems outstrip the capabilities of the serial ports on older and cheaper PCs by taking in data too fast for the computer to be able to read it.
encyclopedia.farlex.com /external+modem   (159 words)

  
 Internet Basics 101 - modem   (Site not responding. Last check: )
Answer: A modem is a piece of hardware that allows your computer to talk to other devices over a regular phone line.
A modem converts digital signals from your computer into audible tones that can be transmitted over regular analog phone lines.
The modem at the other end translates the analog signal back into the original digital signal and sends that information to the computer.
www.usd.edu /trio/tut/start/modem.shtml   (322 words)

  
 Modem Protocols Explained   (Site not responding. Last check: )
It is also possible for the two modems to change speeds in the middle of a connection, perhaps because they have detected an increase in telephone-line noise; this is called "retraining" -- the connection goes "on hold" for a couple seconds, but is not broken.
Modems may incorporate data compression methods to increase the effective throughput of your data beyond the actual connection speed.
When using error correction or compression, or modems that are capable of retraining, it is essential to enable an effective form of flow control between each modem and the computer (or terminal, or other device) it is immediately connected to.
www.columbia.edu /acis/networks/protocols.html   (1473 words)

  
 LEARN THE NET: Getting Connected
To go online your computer must be equipped with a modem, a device that translates the digital signals from your computer into analog signals that travel over a standard phone line.
A modem on the other end of the line understands it and converts the sounds back into digital information.
Modems come in different speeds and are measured in bps or bits per second.
www.learnthenet.com /english/html/04connec.htm   (416 words)

  
 Modemsite.com: 56k Modem Drivers, Information and Troubleshooting
Includes information to help you identify your modem, measure, test and tweak your speed, with links to the latest modem driver downloads.
How 56k modems work, and why all users may not be able to achieve 56k connections.
Modem related problems are the biggest source of trouble for many PC computer users.
www.modemsite.com   (233 words)

  
 Technorati Tag: modem   (Site not responding. Last check: )
Used and Refurbished Paradyne Modems Quinn Data Corp. specializes in used and refurbished Paradyne modems and CSU DSUs: 3150, 3160, 3161, 3162, 3164, 3165, 3170, 3510, 3610, 3615, 3800, 3812, 3825, 3910, 3920.
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Modems from CDW Pre-configured business networking gear from a dedicated CDW business account rep. $12.99 for orders up to 30 lbs.
www.technorati.com /tag/modem   (319 words)

  
 Data Communications FAQ (Windows Version)
When using an external modem, be sure to purchase a high quality cable to connect it to the comm port on your computer.
It is important to understand the difference between "line speed" (the speed with which your modem talks to the other modem), and Data Terminal Equipment or "DTE speed" (the speed with which your PC talks to the modem).
And, if you use an external modem, be sure to use a high quality cable from the PC to the modem and check that it is securely connected.
www.malch.com /comfaq.html   (3820 words)

  
 Information, Help, and Drivers related to Computer Modems
Typical modems are referred to as an asynchronous device, meaning that the device transmits data in an intermittent stream of small packets.
Internal: Modem which would be plugged into a slot located within or on the computer.
External: Modem which is located within a box and is hooked up externally to the computer, generally VIA the Serial Ports.
www.computerhope.com /help/modem.htm   (472 words)

  
 Controlling your Modem with AT Commands
If both your modem and the remote modem that you are connecting with have phones connected through the phone jacks on the modem, this mode will allow you to toggle between a voice connection and a data connection.
Here the modem dials 9 for an outside line and then waits for a dial tone (the default maximum wait time varies from modem to modem, but the range is usually 30 to 50 seconds, but you can change this value in register S7).
Here you instruct the modem to tone dial the number and then, if it hears ringing, to wait up to fifty seconds for 5 seconds of silence before dialing the remaining digits (this could be an extension number, a password, or an account number).
www.zoltrix.com /support_html/modem/USEMODEM.HTM   (3427 words)

  
 HowStuffWorks "How Modems Work"
We'll start with the original 300-baud modems and progress all the way through to the ADSL configurations!
Let's get started with a short recap of how the modem came to be.
Search for Modems at Alibaba - the world’s largest online base of suppliers and importers.
www.howstuffworks.com /modem.htm   (142 words)

  
 56K.COM: Beware Soft Modems
A controller provides the modem's identity: this is where the protocols for hardware error correction, hardware data compression, and basic modulation protocols (such as V.34, x2 or K56flex) exist.
One RPI modem user reported slow transfer rates and dropped connections until he upgraded his PC from eight to sixteen megabytes of RAM (which improves performance in Windows).
Soft modems are also popular for features like DSVD (digital simultaneous voice and data) and answering machine features, which are easier to implement with a soft modem.
www.56k.com /reports/winmodem.shtml   (1195 words)

  
 Modem
The Communicator V.90 modem is based on Intel / Ambient MD 5662 chipset; a three-chip modem architecture that provides high-speed data, fax and voice modem operation.
With these USB modems, all of the futures on driver update that will be simple software update.
USB Communicator modem is capable of providing ease of use and strong performance that reducing the Total Cost of Ownership.
db.jaton.com /Modem.aspx   (545 words)

  
 Navini Networks   (Site not responding. Last check: )
The Ripwave modem is the point of connection to the Navini network and provides portable/mobile, anytime, anywhere Internet access.
With the Ripwave modem, there is no need to send technicians to climb the roof, no holes to drill, no computers to be opened up and no installation required.
The Ripwave modem is the ideal mechanism to deliver broadband access to your residential, SOHO and SME (small/medium enterprise) customers.
www.navini.com /pages/products/cpe.htm   (126 words)

  
 Conexant: Support
We have shipped hundreds of millions of modem chipsets for use in desktop computers, notebook PCs, PDAs, video game consoles and many other personal computing applications.
Conexant designs the chipsets for the technology, which are in turn custom-designed for every manufacturer we do business with.
As such, we suggest that if you have an issue with your modem, please contact your manufacturer for information regarding drivers, installations, repairs and upgrades.
www.conexant.com /support   (121 words)

  
 Modems
An overview of modem functionality and some basic terms.
A look at the various modem protocols used since the beginning.
Possible ways to increase the speed of an external modem.
www.pcmech.com /modem.htm   (75 words)

  
 Define modem - a definition from Whatis.com
A modem modulates outgoing digital signals from a computer or other digital device to analog signals for a conventional copper twisted pair telephone line and demodulates the incoming analog signal and converts it to a digital signal for the digital device.
In recent years, the 2400 bits per second modem that could carry e-mail has become obsolete.
14.4 Kbps and 28.8 Kbps modems were temporary landing places on the way to the much higher bandwidth devices and carriers of tomorrow.
whatis.techtarget.com /definition/0,289893,sid9_gci212583,00.html   (205 words)

  
 Cable Modem Resources on the Web   (Site not responding. Last check: )
Here is a collection of web resources about cable modem systems, including manufacturers, system trials, articles, and papers.
Their alliance with 3Com to develop cable modem products, press release (3/25/96).
Alliance with Fore to develop ATM cable modems, press release (1/9/96).
rpcp.mit.edu /~gingold/cable   (2628 words)

  
 cablemodem.ch - Kabelmodem, Kabelinternet und Cablecom hispeed Forum, Providerliste und Speedtest
Es gibt auch Kabelmodems, die mit einem Wireless Access Point kombiniert sind und eine Funkverbindung zum Computer aufbauen.
Solche Ausführungen werden oft als Wireless Cable Modem Gateway bezeichnet.
Das Gegenstück zum Kabelmodem beim Kabelnetzbetreiber (z.B. Cablecom) wird Cable Modem Termination System (CMTS) oder Headendcontroller genannt.
www.cablemodem.ch   (650 words)

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