The Bell 103 modem or Bell 103 dataset was the second commercial modem for computer s, released by AT&T in 1962 . It allowed digital data to be transmitted over regular unconditioned telephone line s at a speed of 300 bits per second . It followed the introduction of the 110 baud Bell 101 dataset in 1958. The Bell 103 modem used audio frequency shift keying to encode data. Different pairs of audio frequencies were used by each station The originating station used a mark tone of 1,270 Hertz Hz and a space tone of 1,070 Hz. The answering station used a mark tone of 2,225 Hz and a space tone of 2,025 Hz. Although original Bell 103 modems are no longer in common use, this encoding scheme is referred to generically as Bell 103 modulation , and any device employing it as Bell 103 compatible or a Bell 103 modem . For many years, higher speed modems retained the ability to emulate the Bell 103, allowing a fallback method for data to be communicated at low speed if channel conditions deteriorated. Applications Bell 103 modulation is still in use today, in shortwave radio , amateur radio , and some commercial applications. Its low data signaling rate signalling speed and use of audio frequencies makes it suitable for noisy or unreliable narrowband links. For example, the CHU callsign CHU shortwave station in Ottawa , Canada transmits a Bell 103 compatible digital time code every minute. Bell 103 modulation is also the standard for amateur packet radio in the High frequency HF shortwave bands. Related technology The ITU T ITU V.21 V.21 communications standard defines a very similar modulation scheme. Commercial 300 baud modems typically support both formats. See also List of device bandwidths Digital modes DEFAULTSORT Bell 103 Modem Category Modems Category History of telecommunications ... more details
Use mdy dates date January 2012 globalize USA date December 2010 Image US Robotics 56K Modem Front.JPG thumb US Robotics 56K Modem external 56k modems are voiceband modems nominally capable of download speeds up to 56 kbit s 56,000 bits per second . In the late 1990s, they were the most popular access method for personal Internet usage, but their use had declined as broadband technologies such as DSL gained wider availability. Speed Image 56 kbits modem.jpg thumb PCI 56k modems The 56 kbit s theoretical ... much noise from the second conversion for 56k to work. The modem s negotiation processes ... signalling article for more detail. The upload speed is 33.6 kbit s if an analog voiceband modem is used V.90 recommendation V.90 , or 48.0 kbit s using a digital modem V.92 . Due to the design ... speed. While faster communications such as DSL and cable modem s became widely available to urban ... es. History Initially there were two rival 56k modem systems. One was K56flex from Rockwell International ... designed to allow both types of modem to be converted to it by a firmware upgrade. This was formally ... of Rockwell s K56Plus and Lucent s V.Flex2 proposals was a proprietary modem chipset from ... logo X2 was a 56 kbit s modem protocol developed by U.S. Robotics . The protocol used V.34 to upload ... avoided as there was only one X2 standard. V.90 V.90 is an ITU T recommendation for a modem , allowing ... to Recommendation V.90 , that establishes a modem standard allowing 48 kbit s PCM upload, but at the expense ... was low. Some providers such as Netzero offer V.92 lines, but with features like Modem on Hold .... Quick connect works by training the client modem on the first call analog and digital characteristics are stored in a local profile, and then retrieved for future connections. Modem on Hold MOH ... Series V http www.v92.com V92.com http web.mit.edu invent iow townshend.html Brent Townshend Modem standards DEFAULTSORT 56 Kbit S Modem Category Telecommunications standards Category Modems de K56flex ... more details
Orphan date December 2009 The ITU T CCITT , an international committee that specifies the way modem s and fax machines transmit information to ensure compatibility among modems, has classified dial up modems according to the following modulation standards Bell 103 Bell 103M & Bell 212A 212A Older standards, Bell 103 transmits at 300 bit s at 300 baud and 212A transmits at 1200 bit s at 600 baud . ITU V.21 V.21 Capable of only 300 bit s, it is an international standard used mainly outside of the U.S. V.22 Capable of 1200 bit s at 600 baud. Used mainly outside the U.S. V.22bis Used in the U.S. and out, it is capable of 2400 bit s at 600 baud. V.23 Used mainly in Europe, it allows the modem to send and receive data at the same time at 75 and 1200 bit s. V.29 A one way half duplex standard that is used mostly for fax machines. Capable of 9600 bit s. V.32 A full duplex standard capable of 9600 bit s at 2400 baud. V.32 modems automatically adjust their transmission speeds based on the quality of the lines. V.32bis A second version of V.32, it is capable of 14,400 bit s. It will also fallback onto V.32 if the phone line is impaired. V.32ter The third version of V.32, capable of 19,200 bit s. V.34 Capable of 28,000 bit s or fallback to 24,000 and 19,200 bit s. This standard is backwards compatible with V.32 and V.32bis. V.34bis Capable of 33,600 bit s or fallback to 31,200 bit s. V.42 A data compression protocol for V.34 which made it more reliable because of error correction. V.42bis A data compression protocol that can enable modems to achieve a data transfer rate of 34,000 bit s. V.44 Allows for compression of Web pages at the ISP end and decompression by the V.44 compliant modem, so transmitting the same information requires fewer data packets. V.90 recommendation V.90 The fastest transmissions standard available for analog signal analog transmission, it is capable of 56,000 ... feature. DEFAULTSORT Modem Standards Category Telecommunications standards ... more details
cleanup date February 2010 Orphan date April 2009 Zenith Cable Modem is one of the first proprietary cable modem s deployed at limited scale. There were 2 basic models, one operating at 500 kbit s, the other at 4 Mbit s using BPSK and about a 25 alpha. History The Zenith cable modem was originally developed ... to support the Prodigy Cable Modem trial begun on a 1500 homes passed fiber node in El Cajon, CA ... of a Prodigy server in the El Cajon headend, connected via the Microchannel based cable modem to an Olsen ... 16 bit 16 bit version. The new design dropped the onboard CPU. The modem connected to the card using ... were powered by the PC. The new modem was frequency agile, with a configuration utility that ran ... prior to installation, and tracked the subscriber to modem MAC address in an Microsoft Excel Excel spreadsheet , as it was too many digits to fit into the billing system. Product Versions White modem, from 1980 s based design br Black Internal Modem, Homeworx br External Modem, 1 Ethernet Jack br External Modem, 2 Ethernet Jacks br HW Revision A First black case modem br HW Revision B Volume Production ..., San Diego University of California San Diego , and other customers. Added modem MAC address to external ... the second coax port. The modem could either operate on one coax built in diplex filter or two Headend ... a residential cable modem inside a server, and a frequency translator to convert the upstream transmit ... section date January 2010 The commercial prospects of Prodigy over cable modem came to reality when ... release 9.32, under the title Node Data Controller SNMP Provisioning a Zenith Cable Modem The physical possession of a properly installed modem connected the subscriber to the network, and the use of this modem with a packet sniffer would enable full viewing of all transmitted and received packets ... to disable a modem remotely. Installing an internal Zenith Cable Modem br Step 1 Verify there is a free .... br Step 5 Update Prodigy Software to dial in using IPX protocol over Zenith Modem instead of 2400 ... more details
Unreferenced date March 2009 The Bell 202 modem was an early modem developed by Bell System . It specifies frequency shift keying audio frequency shift keying AFSK to encode and transfer data at a rate of 1200 bits per second , Duplex telecommunications Half duplex half duplex one way and at a rate of 1800 bits per second Duplex telecommunications Full duplex full duplex using phase shift keying differential phase shift keying DPSK modulation. These signalling protocols, also used in third party modems, are referred to generically as Bell 202 modulation , and any device employing it as Bell 202 compatible . Bell 202 AFSK uses a 1200 Hz tone for mark typically a binary 1 and 2200 Hz for space typically a binary 0 . In North America and perhaps elsewhere , Bell 202 AFSK modulation is used to transmit Caller ID information over Plain old telephone service POTS lines in the Public Switched Telephone Network public telephone network . It is also employed in some commercial settings. Surplus Bell 202 modems were used by amateur radio operators to construct the first packet radio stations, despite its low data signaling rate signalling speed . The modified Bell 202 AFSK modulation, AX.25 , remains the standard for amateur Very high frequency VHF operation in most areas. Notably, Automatic Packet Reporting System APRS transmissions are encoded this way on VHF. On High frequency HF , APRS uses Bell 103 modem Bell 103 modulation. The Bell 202 standard was adopted around 1980 as the communications standard for subsea oil and gas production control systems, pioneered by the then FSSL Controls, a spin out company from Ferranti. This modulation standard was retained until around 2000, when it was superseded by faster FSK and PSK modulation methods, although it is still utilised for extension ... to the host via a single modem channel. Other techniques have included superposition of signal ... Interface Category Modems Digital modes de Bell 202 Modem fr Modem Bell 202 ru Bell 202 ... more details
Merge to Wireless modem date October 2011 for the smart card system termed ConnectCard Port Authority of Allegheny County Fare structure File Option GT 3G UMTS card.jpg thumb One 3G connect card A mobile broadband modem , also known as a connect card or data card , allows a laptop , a personal computer or a router computing router to connect to receive Internet access via mobile broadband . History Early connect cards used the PCMCIA or ExpressCard ports, commonly found on legacy laptops. The expression connect card instead of connection card had been registered and used the first time by Vodafone as brand for its products but now is become a brandnomer or genericized trademark used in colloquial or commerce commercial speech for similar product, made by different manufacturers, too. Major producers are Huawei , Option N.V. , Novatel Wireless . More recently, the expression connect card is also used to identify internet USB keys. ref http www.wireless.att.com cell phone service cell phones pc cards.jsp Connect cards on At&t ref Standard First cards were based on the GPRS standard, then were developed for the EDGE standard. Modern cards use advanced UMTS standard like the HSUPA and HSDPA . References references See also Mobile broadband Option N.V. Huawei Category Modems Category PCMCIA Category ExpressCards fr Cl 3G it connect card de UMTS Datenkarte ... more details
The Timex Sinclair 2050 TS2050 was a computer modem built by Westridge for Timex Computer Corp. A very little quantity was sold with Timex Sinclair label, most with the designed Timex case was sold with the label Westridge 2050 because Timex exited the computer market when the modem started to be manufactured. A lot of people bought the modem board and made custom casing. Because it was very slow 300bps , a magazine published a way to modify the modem to convert it to a serial port, allowing users to connect faster modems. A cassette was released with the modem with software for TS1000 TS1500 on side A and for TS2068 on side B, to control it. External links http timex.comboios.info Timex Computer World Sinclair computers and clones Category ZX Spectrum clones compu hardware stub pl Timex Sinclair 2048 ... more details
for the seasonal changing of clock Daylight saving time Fall back is a feature of a modem protocol in data communication whereby two communicating modem s which experience data corruption due to line noise , for example can renegotiate with each other to use a lower speed connection. Fall forward is a corresponding feature whereby two modems which have fallen back to a lower speed can later return to the higher speed if the connection improves. A common feature modem s was the concept of fallback, allowing them to talk to less capable modems. During the call initiation the modem would play a series of signals into the line and wait for the remote modem to answer them. They would start at high speeds and progressively get slower and slower until they heard an answer. Thus, two USR modems would be able to connect at 9600 bit s, but, when a user with a 2400 bit s modem called in, the USR would fall back to the common 2400 bit s speed. This would also happen if a V.32 modem and a HST modem were connected. Because they used a different standard at 9600 bit s, they would fall back to their highest commonly supported standard at 2400 bit s. The same applies to V.32bis and 14400 bit s HST modem, which would still be able to communicate with each other at only 2400 bit s. A modem that can fall back in order to communicate with an older, slower modem is an example of backward compatibility , while one that can fall back in order to communicate when the line becomes noisy is an example of graceful degradation . Attribution Article based on http foldoc.doc.ic.ac.uk foldoc foldoc.cgi?query fall back fall back and http foldoc.doc.ic.ac.uk foldoc foldoc.cgi?query fall forward fall forward at http www.foldoc.org FOLDOC , used with Wikipedia Foldoc license permission . Category Computer data ... more details
10BASE T Ethernet 100BASE T Ethernet 1000BASE T Ethernet SURFboard SB3100 cable modem no no no no yes yes yes no SURFboard SB4100 cable modem no no no no yes yes yes no SURFboard SB4200 cable modem no no no no yes yes yes no SURFboard SB5100 cable modem no no no no yes yes yes no SURFboard SB5101 cable modem no no no no yes yes yes no SURFboard SB5120 cable modem no no no no yes yes yes no SURFboard SB5102 cable modem no no no no yes yes yes no SURFboard SB6120 cable modem no no no yes yes yes yes yes SURFboard SB6121 cable modem no no no yes yes yes yes yes SURFboard SB6141 cable modem no no no yes yes yes yes yes SURFboard SB6180 cable modem no no no yes yes yes yes yes SURFboard SB6220 cable modem no no no no yes yes yes yes SURFboard SBV5121 voice cable modem no no yes no yes yes yes no SURFboard SBV5122 voice cable modem no no yes no yes yes yes no References Reflist Category Motorola ... more details
AUPC may refer to Arellano University Plaridel Campus A.U.P.C. , a private university in the Philippines Automatic Uplink Power Control AUPC , a feature of high end satellite modem s disambiguation ... more details
orphan date March 2010 Uncapping , in the context of cable modem s, refers to a number of activities performed to alter an Internet service provider s modem settings. It is sometimes done for the sake of Bandwidth signal processing bandwidth i.e. by buying a 512kbit s access modem and then altering it to 10Mbit s , pluggable interfaces as by using more than one public ID , or any configurable options a DOCSIS modem can offer. Uncapping may be considered an illegal activity, such as Theft of services theft of service ref http www.computerworld.com s article 9140239 Cable modem hacker busted by feds Cable modem hacker busted by feds ref , and many Internet service providers check modem configuration files nightly to detect uncapped modems. If caught, uncappers risk possible account termination and or prosecution for theft of service. Citation needed date February 2007 Note that regardless of legality, uncapping may be a violation of the Terms of Service agreement that the customer has with the ISP. Methods There are several methods used to uncap a cable modem, by hardware, software, tricks, alterations, and modifications. The first technique there were others before this to enjoy any success uncapped Motorola modems such as the SB3100, SB4100, and SB4200 models . By Spoofing attack spoofing the Internet service provider s TFTP server, the modem is made to accept a different configuration file than the one provided by the TFTP server. This configuration file tells the modem the download and upload caps it should enforce. An example of spoofing would be to edit the configuration file, which requires a DOCSIS editor, or replacing the configuration file with one obtained from a faster modem e.g. through a Gnutella network . An alternate method employs dhcpforce. By flooding a modem ... can convince the modem to accept any desired configuration file, even one from one s own server ... logic TTL to the modem s RS 232 adapter, and get access to the modem s console directly to make ... more details
, and gender mender . Null modem main Null modem Image Null modem.jpg thumb right A null modem should ... the function of changing the gender, but is not the same thing. This device is called a null modem . Despite the word modem appearing in the name, it is not a modem. Rather, it is a device with the appearance of a gender changer that imitates the presence of a modem. A normal gender changer simply changes ... 2 connects to 2, pin 3 connects to 3, and so forth. A null modem reroutes wiring so that two serial ..., a null modem crosses pins 2 and 3, so that pin 2 on one side is connected to pin 3 on the other .... Two to three other pairs are similarly crossed in a null modem. A null modem may also act as a gender ... gender on each side. It is important to recognize that a null modem used in place of a gender changer or a gender changer used in place of a null modem will result in an inoperable connection, even ... Modem to clarify the internal wiring. See also Gender of connectors and fasteners References http catb.org ... more details
Unreferenced stub auto yes date December 2009 Orphan date February 2009 An internet access program is a software Computer program program , generally included as part of the operating system , to access the Internet . There are two main ways to access the Net. Dial up access that generally uses a narrowband modem . Network access that generally uses a broadband cable modem or Digital Subscriber Line DSL , although direct ethernet access is sometimes available. DEFAULTSORT Internet Access Program Category Internet Internet stub ... more details
device, such as a modem. This signal is a simple high low status bit that is sent from DCE to DTE ... depending on the device connected, but the most typical meaning is to indicate when a modem is connected to another remote modem via telephone lines. The word carrier is a reference to the analog Carrier wave carrier signal generated by a modem, which is modulation modulated to carry the data. On a data modem, loss of the carrier equates to termination of the connection. Much like the Ring Indicator ... s primary way to find out that the modem has lost its connection to the remote host. Aside ... such as the phone line being disconnected. It is possible to use a modem without the DCD signal, however the only way for the computer to know that a connection is disconnected is by the modem ... over the connection versus from the modem. External modems with LED status lights usually have a light labeled CD carrier detect . This status light is directly coupled with what the modem is sending the DCD line. By default, when a modem is powered up, the DCD signal stays low. It does not go high until the modem either makes an outgoing call, or answers an incoming call, and then connects with a data modem on the other end. The signal goes high at the same time the modem reports its CONNECT message, and stays high until the call is disconnected. The signal goes low again once the local modem has lost contact with the remote modem, regardless of which side initiated the disconnect. So long as the DCD signal is high, the computer can assume that any data coming from the modem was actually .... ref name Hayes Hayes command set ref AT&C0 Always assert DCD This command tells a modem that it should ... a pre configured modem to automatically answer and provide remote access to some equipment that wasn t meant to be connected to a modem. In that case, that equipment may require a high signal at all times for the communication setup to function. An external modem that has been configured with AT&C ... more details
Orphan date February 2009 A Technical Assurance Center , assistance? or TAC , is a department within a company that s primary purpose is networking, or an ISP . The TAC also works closely with a company s Network Operations Center, or Network operations center NOC . A TAC can only monitor items with a return signal, such as a modem or a Cable modem Cable modems and VoIP MTA . Forward only systems, such as cable boxes, are currently unable to be monitored. Category Network management Comp sci stub ... more details
Orphan date February 2009 norefs date June 2011 The Packetized Ensemble Protocol PEP is a Communications protocol protocol used by Telebit modem s. It uses the full Bandwidth computing bandwidth 3000 Hz of the telephone line s and dividing it in hundreds of channels. The modem only chooses the channels that are error free, which makes PEP usable on bad lines. The disadvantage is the relatively long time it takes to switch between sending and receiving data. Category Modems Category Network protocols compu network stub ... more details
Infobox Computer name BT Voyager developer BT Group type ADSL Modem photo caption first release date discontinuation date processor baseprice website http www.voyager.bt.com www.voyager.bt.com The BT Voyager series is a series of ADSL modem s supplied by British Telecommunications plc . Several models include WiFi , Router computing routing and voice over IP capabilities. BT Group Category Modems Category BT Group computer hardware stub ... more details
E220 may refer to The E number code for sulfur dioxide , a preservative for dried fruits Huawei E220 , a 2006 USB modem Mercedes Benz E220, a Mercedes Benz E Class car Letter NumberCombDisambig fr E220 ... more details
CONNECT may stand for CONNECT, the Alfa Romeo 147 on board information system The CONNECT request method in the Hypertext Transfer Protocol HTTP A Hayes command set CONNECT string from a modem See also CONNECT Organization Connection disambiguation disambig ... more details
File SupraFAXmodem 144 LC.jpg thumb SupraFAXmodem 144 LC modem 1996 File SupraFAXmodem 144 LC Sticker.jpg thumb Sticker on bottom of SupraFAXmodem 144 LC modem The SupraFAXModem 14400 was one of the first truly affordable v.32bis modem s to come to market. Launched in January 1991 at a 399 price point, the 14,400 bit s model was less expensive than most 9600 bit s models, supported many additional features, and was housed in an attractive case. The SupraFAX is an example of a disruptive technology although it arrived into an existing modem market, its price performance ratio was so great compared to any other model available that its introduction drove modem prices sharply downward. Whereas a 9600 bit s model was perhaps 599 only a month before its introduction, by the end of the year 250 models were not uncommon. Supra, Inc. had been a small player in the computer market through the mid to late 1980s, known originally for their external hard drive s for the Atari ST and a variety of follow on products. During 1991, Rockwell International s chip making arm developed a new model driver chipset that included all of the latest standards that were then under development. Supra, never having been known as a player in the modem world, designed a modem based on the new chipset, and arranged a short term exclusivity agreement. Not content with being the first consumer v.32bis modem on the market, Supra chose to introduce a new display on the front, a two digit green electroluminescent display that showed the speed of connection and other information such as RI for ring indication and CD ... a common feature of external modems.The case itself was about half the size of a normal modem, the standard ... by the vast majority of modems since then. In addition to the basic modem, Supra also introduced software to make better use of all the features of the modem. In particular, Supra re packaged FAXstf ... 288, the first consumer v.34 modem, and then a series of various versions with different ... more details
Systems br Telemetry products Radio modem s homepage http www.satel.com satel.com intl Yes SATEL is Finnish radio modem manufacturer specialising in design and manufacture of radio modems for Surveying ... of the first radio modem. Product development has been guided by emphasizing RF sensitivity and ensuring ... SATEL LOGO.jpg Radio modems in general A radio modem transmits data over a wireless connection to another radio modem over a point to point or multipoint link. Radio modems are independent of mobile ... modem networks can use either unlicensed e.g. ISM band or licensed frequency bands UHF , VHF . The operation range of a radio modem varies depending on the transmission power, antenna gain and mast height, and environment. In rural areas a 1 W radio modem with a Line of sight propagation line of sight ... 10 km. With a 10 W radio modem, a range of up to 80 km can be reached in favorable environments. By using radio modem repeaters, much broader areas can be covered. http www.satel.com products radio modems Products Serial and TCP IP communication The SATELLINE radio modem family offers transparent ... professional motor sports to runway telemetry at airports. The SATELLAR Digital System radio modem ... content hannover messe satellar linux radio modem the worlds first radio modem that is a linux ... needs over a few kilometers, SATELLINE 1870E is a straightforward solution. This radio modem operates ... longer distances can be achieved. The radio modem can accommodate point to point as well as point to multipoint communications. SATELLINE 1915 is a similar radio modem, which employs frequency hopping and spread spectrum technologies. The compact, versatile radio modem operates in the 902 928 ... for high end applications requiring a longer range. With these radio modems, a reliable radio modem ... MHz and VHF 135 174 MHz and 218 238 MHz frequency bands. The modem series SATELLINE 3AS d ... band data communication, cross brand compatibility is an important aspect for radio modem deployers ... more details
Wake on Ring WOR , sometimes referred to as Wake on Modem WOM , is a specification that allows supported computers and devices to wake up or turn on from a sleeping, Hibernate OS feature hibernating or soft off state e.g. Advanced Configuration and Power Interface ACPI state G1 or G2 , and begin operation. The basic premise is that a special Signalling telecommunications signal is sent over phone lines to the computer through its dial up modem, telling it to fully power on and begin operation. Common uses were archive database s and Bulletin board system BBSes , although hobbyist use was significant. Fax machines use a similar system, in which they are mostly idle until receiving an incoming fax signal, which spurs operation. This style of remote operation has mostly been supplanted by Wake on LAN , which is newer but works in much the same way. See also Advanced Configuration and Power Interface Ring Indicator Additional Resources http www.smartcomputing.com editorial dictionary detail.asp?guid &searchtype &DicID 19523&RefType Encyclopedia Wake on Modem entry from Smart Computing Encyclopedia dead link. would be nice to see it, if anyone can find it http global.aopen.com.tw tech techinside wom.htm Zero Voltage Wake On Modem diagram from AOpen Category Networking standards Category BIOS Category Remote control de Wake On Modem pt Wake on Ring ... more details
Unreferenced date December 2009 Orphan date November 2006 The USRobotics Sportster magic string was a modem AT command that exploited the fact that revision 4.1 USRobotics Sportster 14.4 modems had exactly the same internal hardware and circuitry as the much more expensive USRobotics Dual HST 16.8 modems. Both modems were produced in the early 1990s. In ASCII , the magic string is represented as ATGW03C6,22GW05CD,2F The effect of setting a Sportster 14.4 s b Status register register to the value 6 , and subsequently sending the magic string to the modem , is the modem becoming a Dual HST 16.8, which at the time retailed for roughly five times the price 700 USD as the consumer oriented Sportster 14.4. After receiving the magic string, the modem identifies itself as USRobotics Courier 16800 HST Dual Standard . Consequently, End user users fortunate enough to be in possession of this particular revision of the modem found themselves able to use digital communications protocols normally reserved for the corporate arena or Bulletin Board System SysOps, with hardware they would otherwise not have been able to afford. USRobotics removed the ability for users to issue the magic string in subsequent hardware revisions. DEFAULTSORT Usrobotics Sportster Magic String Category Modems ... more details
unreferenced date February 2011 The Bell 101 dataset or Bell 101 modem was the first commercial modem for computers , released by AT&T in 1958 for use by Semi Automatic Ground Environment SAGE and in 1959 made commercial shortly after AT&T s Bell Labs announced their 110 baud modulation frequencies. The Bell 101 modem allowed digital data to be transmitted over regular unconditioned telephone lines at a speed of 110 bits per second . Bell 101 modems are no longer in use, and were quickly replaced by its successor the Bell 103 modem . Semi Automatic Ground Environment SAGE modems were described by AT&T s Bell Labs as conforming to the Bell 101 dataset standard. The Bell 101 modems were the first commercial equipment to use ASCII , which was called four row , as opposed to the Baudot code Baudot three row 6 bit character code which was predominate from 1908 1962, prior to the rise of Extended Binary Coded Decimal Interchange Code EBCDIC . See also List of device bandwidths Digital modes DEFAULTSORT Bell 101 Modem Category Modems Category History of telecommunications ... more details
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