otheruses pp move indef refimprove date October 2010 A modem mo dulator dem odulator is a device that modulates ... . The most familiar example is a voice band modem that turns the digital data of a personal computer ... can be transmitted over telephone lines and demodulated by another modem at the receiver side to recover ..., or the number of times per second the modem sends a new signal. For example, the ITU V.21 standard ... multiplex equipment that met the definition, but the modem function was incidental to the multiplexing ... Hertz Hz and the answering modem transmitting at 2,025 or 2,225 Hz. The readily available ... , and the IBM 2741 . AT&T reduced modem costs by introducing the originate only 113D and the answer ... The Novation CAT acoustically coupled modem For many years, the Bell System AT&T maintained a monopoly ... introduced the 212A modem to compete with Vadic. It was similar in design to Vadic s model, but used the lower frequency set for transmission. It was also possible to use the 212A with a 103A modem ... with acoustic coupling, thereby locking out many potential modem manufacturers. In 1977, Vadic responded with the VA3467 triple modem, an answer only modem sold to computer center operators ... of BBSes Image fax modem antigo.jpg thumb left US Robotics Sportster 14,400 Fax modem 1994 The next ... was an otherwise standard 103A 300 bit s modem, but was attached to a small controller ..., the computer could dial the phone directly by sending the modem a command, thus eliminating ... server side modem on the market, and the BBSs flourished. Almost all modern modems can interoperate ... over a high speed commonly 14.4 kbit s modem. Software running on the host computer can convert any image into fax format, which can then be sent using the modem. Such software was at one time ... right A PCI Winmodem softmodem on the left next to a traditional ISA modem on the right . Main Softmodem A Winmodem or softmodem is a stripped down modem that replaces tasks traditionally handled in hardware ... more details
wiktionary modem A modem is a device that encodes and decodes digital data transmitted by a telephone or other analog communications system. Modem may also refer to Mr. Modem Richard A. Sherman , an American author, syndicated columnist, and talk show host Democratic Movement France MoDem Mouvement D mocrate , a centrist and pro European French political party disambig eu Modem argipena ... more details
Orphan date February 2009 A modem script is a settings file that some software programs use to communicate with a modem . They are also known as CCL files Connection Control Language files . Like a modem init string, modem scripts files provide modem configuration settings. Modem scripts go beyond init strings by providing an internal scripting language that script authors can use to tune the modem s response. Its main use with Terminal Emulator s and Dialer s. Category Modems Category Scripting languages unreferenced date August 2007 compu lang stub ... more details
In telecommunication , the term wideband modem has the following meanings A modem whose modulated output Signalling telecommunications signal can have an essential frequency spectrum that is broader than that which can be wholly contained within, and faithfully transmitted through, a voice channel communications channel with a nominal 4 kHz Bandwidth signal processing bandwidth . A modem whose bandwidth capability is greater than that of a narrowband modem . References FS1037C MS188 wiktionary Category Networking hardware Category Modems compu hardware stub ... more details
Unreferenced date August 2008 Image PCI V.92 Fax Modem Card Digon3.jpg thumb right A V.92 fax modem card A fax modem enables a computer to transmit and receive documents as fax es. A fax modem is like a data modem but is designed to transmit and receive documents to and from a fax machine or another fax modem. Some, but not all, fax modems do double duty as data modems. As with other modem s, fax modems can be internal or external. Internal fax modems are often called fax boards. In the early 1990s small business PCs commonly had a PC based fax modem card and fax software typically WinFax Pro . Largely replaced by E mail , PC based faxing with a fax modem declined at the turn of the century. Where faxing from a PC is required there are a number of Internet fax Internet based faxing alternatives. Where businesses still had one or more traditional fax machines churning out pages, they were usually outnumbered by PCs processing E mail. PC faxing Computer users may set up a PC fax modem with card, telephone line access and software, or use a service similar to printing from a PC or sending an E mail message. Fax integration is available in unified communications e.g. E mail, Voice Mail and Fax managed together , in a number of Business telephone system Hosted PBX systems Hosted PBX products where standard features allow users to send a fax by using the fax phone number as the address of a E mail message, and receive incoming faxes via E mail with the Fax content presented as a Portable Document Format PDF attachment. Medical systems continue to use this technology into the 21st century, but many home and business users dropped the use of fax modems in favor of high speed internet . See also Fax Fax demodulator Modem Category Modems Category Fax ... more details
Infobox Computer name Apple USB Modem developer Apple Inc. type USB modem photo File Apple usb modem.jpg ... United States dollar US 49 website http support.apple.com kb HT3152 The Apple USB Modem was a combined 56 kbit s data modem and 14.4 kbit s fax external USB modem introduced by Apple Inc. after the internal 56k modem was dropped on the October 12, 2005 iMac G5 revision. While it looks ..., the Apple Modem 300 & 1200 modems ITU T V Series Recommendations V21 V22 . Prior to that they offered ... standard 2400 data and combined 9600 fax ITU T V Series Recommendations V29 Apple Fax Modem in 1987. Apple introduced the internal 2400 data fax modem card for its Macintosh Portable in 1989 as well as released its last external desktop Apple Data Modem 2400 . Only standard internal modems ... rather than dedicated hardware like Apple s proprietary internal Express Modem . The Apple USB Modem is Apple s first true external modem since the Apple Data Modem 2400 was discontinued in 1992. As of September ... operates by default in 64 bit mode, the USB modem will not function in Lion without workarounds. ref ... of Mac accessdate August 16, 2011 ref Features The Apple USB Modem supports V.92 , Caller ID , wake on ring, telephone answering V.253 , and modem on hold. The modem is manufactured by Motorola . A device driver for the modem was introduced with Mac OS X version 10.4.3. It retailed for United States dollar US 49 at the time of its introduction. Apart from using the Apple USB Modem for Internet ... exchange PBX and answering machine software. The decision to drop the built in dial up modem is reminiscent ..., the magnetism of the MagSafe connector affects the USB external modem. Placing the modem away .... If the internal modem is not answering rings, verify that you do not have Wake when the modem ... . References reflist External links http docs.info.apple.com article.html?artnum 303262 Apple USB Modem ... Category Modems Category Universal Serial Bus ru Apple USB Modem ... more details
In telecommunication , a narrowband modem is a modem whose modulated output Signalling telecommunication signal has an essential frequency spectrum that is limited to that which can be wholly contained within, and faithfully transmitted through, a voice channel communications channel with a nominal 4 kHz Bandwidth signal processing bandwidth . Note High frequency HF modems are limited to operation over a voice channel with a nominal 3 kHz bandwidth. References FS1037C MS188 Category Modems compu network stub ... more details
No footnotes date April 2011 file Null modem.jpg thumb A null modem adapter Null modem is a communication ... use of the RS 232 cable to connect two teleprinter devices to modem s in order to communicate with one another null modem communication was possible by instead using RS 232 to connect the teleprinters ... equipment DCE e.g. a modem . With a null modem connection the Transmission telecommunications ... handshaking handshake lines are crosslinked. Several wiring layouts are in use because the null modem .... Each teleprinter would be physically connected to its modem via an RS 232 connection and the modems ... to connect two teleprinters directly without modems null modem then they would crosslink the connections. The term null modem may also refer to the cable or adaptor itself as well as the connection method. Null modem cables were popular means of transferring data between the early personal computers in the 1980s and early 1990s. Cables and adapters file Null modem cable 1.jpg thumb A null modem cable A null modem cable is a RS 232 serial cable where the transmit and receive lines are crosslinked ... serial cable is used, together with a null modem adapter computing adapter . The adapter contains the necessary crosslinks between the signals. Pin mapping file D25 Null Modem Wiring.png thumb DB 25 null modem wiring diagram file D9 Null Modem Wiring.png thumb DE 9 null modem wiring diagram This is one ... 6 6 DSR Applications The original application of a null modem was to connect two teleprinter terminals ... modem was necessary. Null modems were commonly used for file transfer between computers, or remote ... a null modem connection. The later versions of MS DOS were shipped with the InterLnk program. Both ... computer. No Ethernet hardware such as a network interface card or a modem is required for this. The popularity ... of null modem cables less common. Nowadays, such a cable can still be useful for Kernel computer science ... and null modem cables are still widely used in these industries with ethernet just slowly becoming ... more details
The modem tax is a hoax dating back to the days of bulletin board system s stating the Federal Communication Commission or the United States Congress intends to impose a tax on modem use. ref http www.snopes.com inboxer pending internet2.asp ref The FCC has described it as an urban myth . ref http urbanlegends.about.com library blfcc.htm ref References reflist Category Hoaxes in the United States Category Internet hoaxes ... more details
BLP sources date September 2010 Richard Sherman Mr. Modem is an author , syndicated columnist , ref cite news url http www.star telegram.com 2010 08 24 2421789 watch for e mail danger signals.html tvg title Watch for e mail danger signals, Mr. Modem says date August 24, 2010 publisher Star Telegram accessdate 10 September 2010 Dead link date October 2010 bot H3llBot ref Publishing publisher , and Radio personality radio host . He is President of Get the Net, Inc. and the creator and publisher of the online computer and Internet help service and weekly subscription newsletter, http www.mrmodem.com Ask Mr. Modem . As a member of the National Speakers Association, he has presented more than 500 seminars and keynote addresses. He has appeared on approximately 500 radio and TV talk show s, and served as host of the Mr. Modem Minute segments produced by FOX TV. In addition, he co hosts the weekly Gutsy Geeks ref cite web url http www.gutsygeeks.com title Gutsy Geeks publisher Gutsy Geeks accessdate 10 September 2010 ref radio show on 1100 KFNX in Phoenix, Arizona Phoenix, AZ . The Gutsy geeks Gutsy Geeks radio program focuses on helping average users understand the benefits of Linux and Open ... Mr. Modem column appears in more than 140 publications throughout the United States U.S. and Canada . As Mr. Modem , Sherman is a featured columnist in Smart Computing magazine and the financial publication, Making Bread magazine. Among his eight books are Ask Mr. Modem , a collection of answers to hundreds of frequently asked computer and Internet questions, and Mr. Modem s Internet Guide for Seniors ... is Mr. Modem s Web, a CD ROM featuring entertaining and informative profiles of more than 1400 of Mr. Modem s favorite Web sites. References reflist Persondata Metadata see Wikipedia Persondata . NAME Modem, Mr. ALTERNATIVE NAMES SHORT DESCRIPTION DATE OF BIRTH PLACE OF BIRTH DATE OF DEATH PLACE OF DEATH DEFAULTSORT Modem, Mr. Category Year of birth missing living people Category Living people Category ... more details
Image Teleplay large.jpg thumb 200px right The Teleplay Modem attached to a NES and a Sega Genesis. The Teleplay Modem was a modem for the Nintendo Entertainment System created by Keith Rupp and Nolan Bushnell , designed to provide online play between NES users, while also possessing compatibility with the Sega Genesis and Super Nintendo Entertainment System Super Nintendo . The first prototype, called the Ayota Modem , had a maximum speed of only 300 bit s, too slow to render normal NES quality graphics. It was unveiled at the 1992 consumer electronics show in Las Vegas, where it received a fairly good reception. Bushnell later dropped out of the project, and Keith Rupp founded the company Baton Technologies . He continued to develop the modem, changing its name to the Teleplay Modem, increasing the speed to 2400 bit s, and also conceiving the idea of Sega Genesis and Super Nintendo system compatibility. The modem would also allow cross platform play between Nintendo and Sega with properly coded games. Three games were developed internally Battle Storm, Terran Wars, and Sea Battle but never released. Both Nintendo and Sega refused to license the Teleplay Modem or the games developed for it. Sega instead licensed AT&T to develop a modem the Edge 16 , but no hardware was ever sold at retail. The venture capitalists behind Baton Technologies feared competing against AT&T and attempting to sell hardware games without the all important licensing, so Baton was unable to fulfill its first 300,000 order, and quickly folded thereafter in the summer of 1993. Later Catapult Entertainment developed the 2400 baud XBand modem, similar to the Teleplay Modem in many respects. Although well funded by Old Viacom Viacom , Catapult failed to receive sufficient developer and gamer backing, folding in early 1997. See also Atari 2600 s GameLine Intellivision s PlayCable Sega Genesis s Sega ... s Famicom Modem External links http www.revrob.com sci a tech topmenu 52 38 a complete history of online ... more details
modem A digital subscriber line DSL modem is a device used to connect a computer or Router computing router to a telephone circuit that has digital subscriber line service configured. Like other modem ... . Typical user interfaces are Ethernet and Universal Serial Bus USB . Although a DSL modem working ... purposes. Compared to voice band modem A DSL modem modulates high frequency tones for transmission to a digital .... It serves fundamentally the same purpose as the Dial up modem Narrow band.2Fphone line dialup modems voice band modem that was a mainstay in the late 20th century, but differs from it in important ways. DSL modems transfer data at a rate which is typically 10 to 20 times that of a voice band modem. A single telephone line can be used for simultaneous voice and data with a DSL modem whereas a voice band modem precludes simultaneous voice traffic. Most DSL modems are external to the computer ... such as webcam s, mice, keyboards etc. . Most DSL modems and DSL modem routers can be configured manually, using a Web page provided by the modem via the Ethernet that the router connects to. The confs generally to open a browser , type the DSL modem s LAN IP address in the browser s address ... on a line which is being used by a voice band modem. DSL modems vary in data speed from hundreds of kilobits per second to many megabits, while voice band modems are nominally 56K modem s and actually ... and voice, DSL filter s are used to separate the two uses. Hardware components File ADSL modem router internals labeled.jpg thumb ADSL modem router internals labeled Commented out Image ADSL Modem Chip.jpg right thumb Inside component chip of a typical ADSL modem. As technology advances, functions ... of integration have benefited DSL just as they benefited other computer hardware. A DSL modem requires ... Modem and Router Reviews Whirlpool DSL Modem reviews http www.adslgeek.com dslmodem ADSL Geek DSL Modem resource http www.dsltechtalk.com DSLtechTalk ADSL DSL Modem Technical resource http www.itbully.com ... more details
Image Famicom Network System.jpg thumb 200px right The Famicom Modem The nihongo Famicom Modem lit. Family Computer Network System is a video game peripheral for Nintendo Entertainment System Family Computer released only in Japan in 1988. ref http www.famitsu.com game news 2006 03 25 103,1143298259,50588,0,0.html Wi Fi 40 . Famitsu . 25 March 2006. ref It allowed the user access to a server that provided cheating in video games game cheats , jokes, weather forecasts, and a small amount of downloadable content. It could also be used to make live stock trades. Unlike the NES Teleplay Modem , it did not provide online play. The idea of downloading content would later be used in the Super Nintendo s Satellaview , the Nintendo 64DD , the Nintendo GameCube GameCube , the Nintendo GameCube Game Boy Advance cable Game Boy Advance Cable , the Nintendo DS s DS Download Play, the Wii s WiiConnect24 , the Nintendo DSi s DSi Shop, and the Nintendo 3DS Nintendo eShop eShop . See also Atari 2600 s GameLine Intellivision s PlayCable Famicom Disk System Mega Drive Sega Genesis s Sega Channel Nintendo Entertainment System s Teleplay Modem Super Nintendo Entertainment System Super Famicom s Satellaview References reflist External links http www.siliconera.com 2006 09 05 nintendos secret online past the famicom modem The Famicom Modem Category Nintendo Entertainment System accessories Category Nintendo hardware Category Online gaming services Category Japan only video game hardware fr Famicom MODEM ... more details
Use mdy dates date March 2012 The 1 Meg Modem in telecommunications was ref cite web title 1 Meg Modem End of Life url http support.nortel.com go main.jsp?cscat OVERVIEW&poid 8061 archiveurl http www.webcitation.org 5gJ2nHcFm archivedate April 25, 2009 deadurl no accessdate April 20, 2009 ref a DSL modem created by Nortel which conforms to the ADSL Lite standard. ref name modemhelp cite web url http www.modemhelp.org dsl.html title Highspeed Alternatives DSL accessdate August 6, 2006 publisher ModemHelp.Org archiveurl http web.archive.org web 20060718223710 http modemhelp.org dsl.html archivedate July 18, 2006 Added by DASHBot ref The 1 Meg Modem was the first xDSL modem to gain approval and registration under FCC Part 68 Rules. ref http findarticles.com p articles mi hb5243 is 199909 ai n20147992 NORTEL NETWORKS Nortel Networks 1 Meg Modem re receives FCC Part 68 Rules approval and registration ref Technical details The 1 Meg Modem can be deployed up to convert 18000 ft m from the central ... 10 fpg collateral 1mmpsi.pdf title Nortel 1 Meg Modem Next Generation Data Access accessdate June 23 ... modems which use Asynchronous Transfer Mode ATM virtual circuits to carry data, the 1 Meg Modem used ... card that supported the 1 Meg Modem and also a card must be added to the drawer that would manage all data from the 1 Meg Modem cards in the drawer. History At the time the modem was released When date July 2011 telephone companies were fearing competition from cable modem s. However, early DSL ... Expands 1 Meg Modem CPE Portfolio url http www.prnewswire.com cgi bin stories.pl?ACCT 104&STORY www ... 20, 1997 title Nortel fills gap between analog, DSL New 1 Meg Modem promises affordable high speed ... August 6, 2006 ref ref name nytimes cite web last Austen first Ian date April 30, 1998 title Modem ... Nortel Networks 1 Meg Modem re receives FCC Part 68 Rules approval and registration. http www.prnewswire.com ... Telecom 1 Meg Modem Declared the Most Practical High Speed Access Solution by Computer Reseller News ... more details
Deleted image removed Image Netgear cmd31t.png thumb right 150px Netgear cable modem model CMD31T. One ... 3.0 cable modem refimprove date August 2010 A cable modem is a type of network bridge and modem that provides ... high speed, asymmetrical cable modem system in 1990. A key Hybrid Networks insight was that highly ... is used for most cable modem systems today. LANcity LANcity was an early pioneer in cable modems, developing ... which was then acquired by Nortel , which eventually spun the cable modem business off as ARRIS . ARRIS ... Zenith Electronics Corporation Zenith offered a cable modem technology using its own protocol which it introduced in 1993, being one of the first cable modem providers. The Zenith Cable Modem ... modem v onepage&q zenith 20cable 20modem&f false isbn 978 0849308598 ref Com21 main Com21 Com21 ... network head ends, the ComPort cable modem in various models and the NMAPS management system using ... supported VLAN s. Com21 developed a DOCSIS modem, but the company filed for bankruptcy in 2003 and closed ... cable modem tests in 1996. For a number of years cable Internet access was only available in Sydney ... for cable modem systems. While significant progress was made, the group was disbanded when North ... an open and interoperable cable modem specification. The group essentially combined technologies ... Cable Modem CDLP CDLP system and the MAC layer from the LANcity system. When the initial specification ... testing program for cable modem equipment, and has since drafted multiple extensions to the original ... service , VoIP use is higher amongst cable modem users. Citation needed date January 2009 Any high ... modem and a VoIP adapter MTA, multimedia terminal adapter bundled into a single device. Network architectural functions In network topology, a cable modem is a network bridge that conforms to IEEE 802.1D for Ethernet networking with some modifications . The cable modem bridges Ethernet frames between a customer LAN and the coax network. Technically, it is a modem because it must modulate ... more details
computer an access point to a network. The modems may be as large as a regular cable modem to as small ... products pccards overview ec400g?cc be&lc en Wireless Modem with GPS example the Ericsson EC400g ref ... landline modem could be plugged, this only provided slow dial up connections, usually 2.4 kilobit per ..., and offered faster dial up speeds of 9.6kbit s or 14.4kbit s without the need for a separate modem ... Laptop Netbook mobile modem Dongle Tethering style width 50 vertical align top Smartphones Cellular ... reflist DEFAULTSORT Wireless Modem Category Wireless networking Modem Category Mobile Web Modem Category Modems pam Wireless modem ja ru ... more details
A satellite modem or sat modem is a modem used to establish data transfer s using a communications satellite as a relay . There is a wide range of satellite modems from cheap devices for home internet access to expensive multifunctional equipment for enterprise use. A modem stands for modulator demodulator . A satellite modem s main function is to transform an input bitstream to a radio signal and vice versa. There are some devices that include only a demodulator and no modulator, thus only allowing data to be downloaded by satellite that are also referred to as satellite modems . These devices are used in satellite Internet access in this case uploaded data is transferred through a conventional PSTN modem or an ADSL modem . Satellite link Main Satellite link A satellite modem is not the only ... to a modem from Data terminal equipment e.g. a computer . The modem usually has Intermediate ... by a modem, and at last handled by data terminal equipment. The LNB is usually powered by the modem ... modem are modulation and demodulation. Satellite communication standards also define error correction ... to control the distant end modem Automatic Uplink Power Control AUPC , that is, adjusting the output ... Satellite modem block diagram.png right thumb 500px Satellite modem s internal structure Probably the best way of understanding modem s work is to look at its internal structure. A block diagram of a generic satellite modem is shown on the image. Almost all parts are optional. Analog tract After a Digital ... multiplexed data stream to several streams which it consists of. Satellite modem doesn t have so many ... . Applications Image ASTRA2Connect Modem front.jpg thumb right The IPmodem satellite modem ... http www.newtec.eu Newtec satellite modem manufacturer http www.astra2connect.com ASTRA2Connect satellite internet provider http www.adaptivem2m.com satellite modem gsm gprs satellite modem.htm GSM GPRS satellite modem provider Satcomm Category Telecommunications equipment Category Telecommunications ... more details
Infobox VG title Modem Wars image File ModemWarsTitleScreen.png 250px Modem Wars caption Title screen developer Ozark Softscape publisher Electronic Arts designer Danielle Bunten Berry Danielle Bunten released 1988 genre Real Time Tactics Citation needed date March 2010 modes Multiplayer ratings N A platforms Commodore 64 C64 br DOS media Floppy disk s requirements Modem Wars is a 1988 Real Time Tactics Citation needed date March 2010 game developed by Ozark Softscape and published by Electronic Arts for the IBM PC and Commodore 64 platforms. ref http www.gamespot.com gamespot features pc unsung heroes sec2 07.html Unsung Heroes Ground Breaking Games Bot generated title ref Summary The first multi computer online game. Modem Wars was played over a modem connection between two machines via telephone or null modem serial connection , with both players controlling a group of robotic units trying to eliminate the opponent s command center. Features such as fog of war , varied unit types, terrain, and formations, all now standards in the genre, were implemented despite the daunting technical ... that Modem Wars was perhaps t he closest predecessor to the groundbreaking and influential Sega ... 1up.com accessdate 2009 01 04 ref Of specific technical interest, Modem Wars has been lauded for its ..., but you accumulate points as if it were a sports game. The name was changed to Modem Wars to call attention to how the game is intended to be played against other humans via modem. The computer AI ... Daniel periodical Computer Gaming World title Modem Wars year 1989 pages 32 35 ref The game also ... noted designer Dan Bunten s intentions for the game blockquote Dan would like us to believe that Modem Wars is a wargame for the rest of us . That is, Modem Wars is a fast moving game that does not get bogged down in the minutia of detail so often associated with wargames. Dan feels that Modem ... modem wars.htm Theodor Lauppert s review Category 1988 video games Category Commodore 64 games Category ... more details
Radio modems transfer data wirelessly across a range of up to tens of kilometres. Using radio modems is a modern way to create Private Radio Networks PRN . Private radio networks are used in industrial critical applications, when real time data communication is needed. Also Radio Data Modem enables user to be independent of telecommunication or satellite network operators. In most cases users use licensed frequencies either in UHF or VHF band. Licensed frequency is reserved for given user in certain area thus ensuring that there is less likelihood to have radio interference from other RF transmitters . Also licence free frequencies are available in most countries, enabling easy implementation, but at the same time other users may use same frequency, thus making it possible that given frequency is blocked. Typical users for Radio Data Modems are Surveying Land survey differential GPS , fleet management applications, SCADA applications utility distribution networks , automated meter reading AMR , telemetry applications and many more. Since applications usually require high reliability of data transfer and very high uptime, radio performance plays a key role. Factors influencing radio performance are Antenna radio antenna height and type, the Sensitivity electronics sensitivity of the radio, the output power of the radio and the complete system design. References Unreferenced date April 2009 reflist Telecommunications Telecommunications stub DEFAULTSORT Radio Modem Category Wireless networking sv Radiomodem ... more details
The Pennywhistle was an early acoustic coupler modem originally designed and built by Lee Felsenstein in 1973, and later commercialized and offered for sale in 1976. It was one of the earliest modems available for hobbyist computer users. ref Roy Allan, A History of the Personal Computer The People and the Technology , Allan Publishing, 2001, pg. 17 ref Like most acoustic coupler modems, the Pennywhistle was replaced by the Hayes Microcomputer Products The Smartmodem Hayes Smartmodem and similar models from the early 1980s. History Origins As part of the effort that would lead to the Community Memory bulletin board system , Lee Felsenstein had found an Omnitech modem or something like that . ref name cl Designed to operate at rates as high as 300 bits per second bps , the modem was able to change its speed to match conditions or differences in the modems at either end. In general it was good for only 100 bps, the speed that was used for much of its operational life. The modem was attached to a Teletype Corporation Teletype ASR 33 Teletype Model 33 ASR machine at Leopold s Records in Berkeley, California and connected to the SDS 940 mainframe computer in San Francisco . ref name cl Crosby, ON LINE AT LEOPOLD S ref Felsenstein was unimpressed by the Omnitech design, especially its price of 300, ref name cl and convinced himself he could design a better version. He found that one half of the design problem was easy generating the proper tones for transmission was simple. The other half of the problem was much harder listening to the incoming signal and processing the tones ... MODEM ref Felsenstein found two key improvements that led to a dramatically less expensive and more ... as a fixed difference from the reference signal coming from the PLL. These improvements meant the modem ... would be interested in a related project, a modem that he had previously designed. Spergel was able to cobble together a version of the modem for a price of 109. ref name levy Steven Levy, http books.google.ca ... more details
Unreferenced date December 2009 Command and Data modes refer to the two modes in which a computer modem ... modems. These modes exist because there is only one channel of communication between the modem and the computer, which must carry both the computer s commands to the modem, as well as the data that the modem is enlisted to transmit to the remote party over the telephone line. When a modem is in command mode , any characters sent to it are interpreted as commands for the modem to execute, per ..., if a modem receives ATDT5551212 while in the command mode, it interprets that as an instruction to dial the numbers 5551212 on the telephone, using touch tone dialing. While in command mode, the modem ..., the modem may respond with the word BUSY in response to the ATDT command, if it hears a busy signal ... directions is terminated by a carriage return . When a modem is in data mode , any characters sent to the modem are intended to be transmitted to the remote party. The modem enters data mode immediately ... by another computer modem, the modem would report the word CONNECT and then switch to data mode ... characters sent are transmitted to the remote party. When a voice capable modem is in voice data mode, any data sent to the modem is interpreted as audio data to be played over the phone line, rather ... always start out in command mode when powered up. Here are the ways a modem can switch to data mode After a successful dial out connection in response to an ATD dial command in which the modem reaches another modem. After answering the phone with the ATA answer command, if another modem is on the other ... , and connecting to another modem. Almost all modems support auto answering when given the command ... 1 second pause. The connection remains, but the modem can accept commands, such as ATH for hangup. The computer can issue the ATO command to return to data mode. The computer instructed the modem ... how computers invoke the termination of a modem call nowadays the escape sequence is rarely used ... more details
Unreferenced stub auto yes date December 2009 A modem sharing device MSD , also commonly known as a line sharing device LSD , modem sharer , or line sharer , allows multiple devices to share a Serial communications serial connection. Only multipoint serial protocols such as bisync are supported. Both Synchronization computer science synchronous and asynchronous datastreams can be used. A common example would have a Tandem Computers Tandem as host connected to multiple automatic teller machine s often with a modem or Cisco Systems, Inc. Cisco router computing router in between. DEFAULTSORT Modem Sharing Device Category Networking hardware Compu hardware stub ... more details
Refimprove date August 2010 Main Modem Voice modem is a term commonly used to describe an analog telephone data modem with a built in capability of transmitting and receiving voice recordings over the phone ... command set used for data modems, in which the host PC commands the modem via a series of commands ... consistent throughout the industry. Because voice mode is not the prototypical use for a modem ... voice modem depend greatly upon the intended application, and include Reliable operation. Many modems ... ID as used in North America is missing from the vast majority of modems. Nearly all modem chipsets ... of death blue screens of death , or simple inoperability of all but a single modem. External RS232 based serial modems do not have this limitation because each modem contains its own microprocessor and is unaware ... Winmodems in which case the problem may persist . Plus versus Hash Each voice modem platform tends ... on a modem by issuing the following command AT FCLASS ? This command is usually supported containing the plus sign whether a modem supports plus or the hash command set, because the command which stands for fax class is part of the industry standard fax commands which always use the plus. A modem ... 8. A modem not supporting voice will respond with ERROR , or with a list of numbers not including 8 ... ? as well. Entering voice mode The command AT FCLASS 8 or AT CLS 8 will put the modem in voice ..., most modems will respond with Data Link Escape DLE messages instead of or in addition to normal modem ... reported by each modem is specific to its chipset and documented in its reference guide. Querying the modem s capabilities The command AT VLS ? or AT VLS ? usually returns a list of operating modes that are specific to each modem. Each of these numbered modes determines the telephone line s on hook ... offer a listing of all the possible combinations of modes even if the specific modem board doesn ... on the circuit board. Example of response to AT VLS ? from a modem on the market in 2006 AT VLS ... more details
Image CMTS frontside.jpg right thumb Cable modem terminations system A cable modem termination system or CMTS is a piece of equipment typically located in a cable television cable company s Cable television headend headend or hubsite, and used to provide high speed data services, such as Cable modem cable Internet or voice over Internet Protocol , to cable subscriber s. A CMTS provides many of the same functions provided by the Digital subscriber line access multiplexer DSLAM in a DSL system. Connections In order to provide these high speed data services, a cable company will connect its headend to the Internet via very high capacity data links to a network service provider . On the subscriber side of the headend, the CMTS enables the communication with subscribers cable modem s. Different CMTSs are capable of serving different cable modem population sizes ranging from 4,000 cable modems ... the cable modem population served by that headend or Hybrid fibre coaxial HFC hub . One way to think ... interfaces carry RF signals to and from the subscriber s cable modem. In fact, most CMTSs have both ... at the cable modem in the subscriber s home. Traffic from a subscriber s home system goes through the cable modem and out to the Internet in the opposite direction. CMTSs typically carry only Internet Protocol IP traffic. Traffic destined for the cable modem from the Internet, known as downstream ... of traffic shaping is more likely done by a Cable Modem or policy traffic switch . A CMTS may also act as a Network bridge bridge or Router computing router . A customer s cable modem cannot communicate directly with other modems on the line. In general, cable modem traffic is routed to other ... DOCSISHelp.com CMTS & DOCSIS Support Community DEFAULTSORT Cable Modem Termination System Category Digital cable Category Internet access cs CMTS de Cable Modem Termination System es CMTS he CMTS mk nl Cable modem termination system no CMTS pl Cable Modem Termination ... more details
Category Motherboard expansion slot de Audio Modem Riser es Audio modem riser gl Audio Modem Riser ja Audio and Modem Riser pl AMR z cze p yty g wnej pt Audio Modem Riser ru AMR ... more details
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