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Topic: Bell 103


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In the News (Tue 29 Dec 09)

  
  Bell - Encyclopedia Dramatica
Alexander Graham Bell, a Canadian, invented the telephone.
Sometime in the 60s, Bell decided to cut corners by using a 2600hz tone that signals that someone is about to make a long distance call.
Bell doesn't sue him, and UC Berkeley gives away the code.
www.encyclopediadramatica.com /index.php?title=Bell&redirect=no   (385 words)

  
 Bell - Encyclopedia Dramatica
Every single dirty rotten thing that has ever happened is all Bell's fault, as will be shown through this brief history.
In 1969, Bell doesn't give Ken Thompson and Dennis Ritchie a decent computer so they can run MULTICS.
Rather than admitting that their service is shitty, Bell blames the h4X0rs.
www.encyclopediadramatica.com /index.php?title=Bell&redirect=no   (385 words)

  
 Bell 103 - Bell103
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".
Bell 103 modulation is still in use today, in shortwave radio, amateur radio, and some commercial applications.
Bell 103 modulation is also the standard for amateur packet radio in the HF (shortwave) bands.
www.kopete.org /Bell-103.html   (236 words)

  
 Bell Modem Standards 103J, 212, 201B/C, 202T, 202S, 208A/B
Bell 103 - Asynchronous data transmission, full-duplex operation over 2-wire dialup or leased lines; 300-bps data rate.
Bell 201 B, Bell 201 C - 201 B: Synchronous data transmission, full-duplex operation over 4-wire leased lines and half-duplex operation over 2-wire leased lines; 2400-bps data rate.
Bell 201 B compatible modems are the first of the fast modems.
www.data-connect.com /bell.htm   (543 words)

  
 What are Modem Standards
In the 1960s and 1970s, Bell Labs created carrier standards for use with Bell equipment and lines to accommodate customers' networks.
Bell 201B compatible modems are the first of the fast modems.
Bell 201C modems are for use with dialup lines and are basically a complement to the 201B.
www.pulsewan.com /data101/modem_vx_basics.htm   (1186 words)

  
 POTS Modem Impairment FAQ
Bell 103 (circa 1962) is the granddaddy of modems.
Bell 212 (circa 1977) was the next step delivering 1200 bps in each direction.
Bell 103 and 212 modems are still commonly used in situations where data rate is unimportant but fast connection setup is, such as alarm circuits.
www.tschmidt.com /writings/POTS_Modem_impairments.htm   (1808 words)

  
 The Telegraph Time Machine
Since the 300 baud Bell 103 standard is obsolete by todays standards, these modems can be found at fleamarkets and hamfests and can usually be had for a few dollars.
The Bell 103 signalling standard allowed equivalent DC loop circuits to be used where true direct current signalling had been eliminated.
Bell 103 modems with manually selectable answer/originate are best for dial- up telegraphy.
www.faradic.net /~gsraven/dialup/telegraph_time_machine.html   (1823 words)

  
 Modem Modulations and Standards
Bell 103: Uses FSK modulation at 300 baud to transmit 1 bit per baud.
Bell 212A: Uses DPSK (Differential phase-shift keying) at 600 baud to transmit 2 bits per second which results in 1200 baud.
V.21: This is the international 300 bps standard which is similar to Bell 103 but not compatible.
home.fuse.net /Walts_Place/modemmodulation.htm   (295 words)

  
 ARC Line powered modems 103, 212A, V22bis
If you are connected to a slower speed modern at the other end of the line, the Modem 2400 NPR automatically "falls back" to match the speed of the slower modern so your data transmission is not interrupted.
The Modern is compatible with all communications software and complies fully with the Hayes' Standard AT Command Set and the ITU V22 bis and V.22 standards, as well as Bell 103 and Bell 212A protocols.
This modem can replace the Bell 103, 212ALP, V.22bis modems and yet it is a small case the size of a DB-25 connector head.
www.arcelect.com /0_arc_line_powered_modems_103.htm   (882 words)

  
 Modems   (Site not responding. Last check: 2007-10-29)
This modem was predominant until the early 1980s, when the Bell 212 modems became available.
This Bell System modem was designed to support asynchronous data at rates of up to 1200 baud on 2-wire dial-up circuits, and up to 1800 baud on conditioned leased lines.
The 212 modem series also incorporates a 300 baud, Type 103, modem for compatibility with pre-existing Bell 103 modems.
www.data-wiz.com /Modems_a_Tutorial.htm   (2731 words)

  
 Bell Modem Standards (Linktionary term)
The Bell standards were the first modem communications protocols.
The first of these standards was Bell 103, which paved the way for today's complex and efficient modem standards, such as V.32bis and V.42bis.
Bell 113A and 113D A originates calls, and D answers calls.
www.linktionary.com /b/bell_modem.html   (217 words)

  
 Tele 2100: Introduction and History of Modems   (Site not responding. Last check: 2007-10-29)
It was called the Bell 103, by AT&T. This first modem allowed full-duplex transmission, and boasted data rates up to 300 bits per second.
Shortly after the Bell 103, there came the Bell 212, which reached speeds of 1200 bits per second.
The automatic adaptive equalizer was invented in 1965 at Bell Laboratories by Robert Lucky.
www.dementia.org /~julied/tele2100/intro.html   (509 words)

  
 AmericanHeritage.com / THE MODEM
Since the amplitudemodulation method was not robust enough to stand up to the noise of ordinary phone lines, the Bell 103 used the slower technique of “frequency-shift keying,” in which the carrier signal shifts between two different frequencies.
The Bell 103 had a top speed of 300 bps, but it was sturdy; technicians boasted that it would work over barbed wire.
The Bell 103 had a top speed of only 300 bits per second, but it was sturdy.
www.americanheritage.com /articles/magazine/it/2004/3/2004_3_12.shtml   (1181 words)

  
 Novation CAT - Wikipedia, the free encyclopedia
Novation's first CAT was an external 300 bit/s Bell 103-standard modem that connected to the phone lines using an acoustic coupler.
These operations were handled directly by software on the host computer; the modem set certain registers when tones were heard on the line, by timing when these registers were set or clear, the software could determine what was happening on the line.
As the names imply, the later included 1200 bit/s Bell 212 operation in addition to 300 bit/s Bell 103.
en.wikipedia.org /wiki/Novation_CAT   (1113 words)

  
 The TTY/TDD - Telecommunications for the Deaf   (Site not responding. Last check: 2007-10-29)
ORIG 1270 Hz In the Weitbrecht modem, tones are transmitted only for slightly longer than the duration of a transmitted character, so the party at the other end can interrupt.
Notice also that the mark is high for the Bell 103 and is the low tone for the Weitbrecht.
This means that in converting a a Bell 103 modem to TTY use, the data will be inverted from RS-232 standard and the mark hold circuitry will need to be inverted.
www.amrad.org /projects/hex/hex_tty.htm   (600 words)

  
 Bell 103 modem - Wikipedia, the free encyclopedia
It allowed digital data to be transmitted over regular telephone lines at a speed of 300 bits per second.
Its low signalling speed and use of audio frequencies makes it suitable for noisy or unreliable narrowband links.
For example, the CHU shortwave station in Ottawa, Canada transmits a Bell 103-compatible digital time code every minute.
en.wikipedia.org /wiki/Bell_103_modem   (295 words)

  
 dsPIC DSC Soft Modem Library   (Site not responding. Last check: 2007-10-29)
Bell standard 103 is also included in this library.
V.21, V.23 and Bell 103 are Frequency Shift Keying (FSK) modems.
Data pump modules, V.21, V.22, V.22bis, V.23, V.32, V.32bis and Bell 103 are implemented in Assembly language.
www.microchip.com /stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1406&dDocName=en023590   (615 words)

  
 Modem HOWTO - Linux Howto
In olden days (and even today), a computer dial-in site might have groups of phone lines, where each group which had a specific type modem on it which supported specific speeds and protocols.
For example, if you had a 2400 bps Bell 212A modem then you simply only dialed in to certain telephone numbers that supported that speed and protocol.
Once a site obtained modems that could support a wider variety of speeds and protocols, then there was no need to have different groups of phone lines.
www.icewalkers.com /Linux/Howto/Modem-HOWTO-27.html   (2536 words)

  
 AT Command Set and Register Summary for Analog Modem Modules
Informs the modem that commands are being sent to it.
Selects ITU or Bell connection mode when connecting at 300 and 1200 bps.
Bell 212A standard at 300 and 1200 bps, USA default
www.cisco.com /univercd/cc/td/doc/product/access/acs_mod/cis3600/sw_conf/firmware/analogat.htm   (3163 words)

  
 Bell Communications Research, Inc from FOLDOC   (Site not responding. Last check: 2007-10-29)
(Bellcore) The research laboratory for the seven regional Bell Telephone companies in the USA that were created by the divestiture of ATandT in 1984.
It can be compared to Bell Laboratories, for which many Bellcore employees used to work.
Currently jointly owned by the seven baby bells (as they are called), there are rumours that it is to be sold by its current owners to become an independent research laboratory
ftp.sunet.se /foldoc/foldoc.cgi?Bell+Communications+Research,+Inc   (113 words)

  
 103 en SoloStocks
103 - 7) y memoria de datos (26 - 163).
103 mm (l) x 67 mm (a) x 23 mm (h).
Peso: 103 g, Redes: GSM1800, GSM1900, GSM"> Samsung d820 (libre)...
www.solostocks.com /bRel_103_1_3.htm   (658 words)

  
 bell from FOLDOC   (Site not responding. Last check: 2007-10-29)
In the teletype days it really was a bell, since the advent of the VDU it is more likely to be a sound sample (e.g.
Also called "G-bell", because it is typed as Control-G. The term "beep" is preferred among some microcomputer hobbyists.
Nearby terms: belief revision « BELL « Bell « bell » Bell 103 » Bell Communications Research, Inc » Bellcore
ftp.sunet.se /foldoc/foldoc.cgi?bell   (92 words)

  
 Algotron Bell 103
Bell 103 Data Pump Software for Texas TMS320C54x/C55x and C2xx/C5x DSPs
This software implements the data pump function of the modem Bell 103, which provides full-duplex data transmission at rates of up to 300b/s over the telephone network.
Duplex channel separation is achieved by band splitting.
www.algotron.com /pages/bell103.html   (270 words)

  
 Modem-HOWTO : Appendix G: Antique Modems
You should read it if you are interested in modem history or are intending to actually use an antique modem.
Bell 103 300 bps; frequency shift keying = FSK
Bell 212A 1200 bps; quadrature differential phase shift keying = QDPSK = DPSK
burks.bton.ac.uk /burks/linux/howto/modem026.htm   (1057 words)

  
 Bell 103 Modem   (Site not responding. Last check: 2007-10-29)
Bell 103 is an American standard for PSTN modems with a bit rate of 300 bps.
Please contact us to propose new words or phrases for this glossary.
Please contact Argos Press to request information on licensing our content (for example this entry on Bell 103 Modem).
www.argospress.com /Resources/modems/bell103modem.htm   (47 words)

  
 Softmodem Bell 103 (Bell 103 Low Speed Software) - GAO Research   (Site not responding. Last check: 2007-10-29)
GAO's Bell 103 modem software implements the Bell 103 data set for up to 300bps full duplex data communication.
This is a split channel modem, like the ITU-T V.21, which uses different frequencies.
GAO's Bell 103 softmodem can either originate or answer calls and can be used with a direct connection or by acoustic coupler.
www.gaoresearch.com /products/modemsoftware/other/b103.php   (344 words)

  
 Bell 103 via soundcard - Digital Forum at eHam.net
I'm looking for software that will understand 300 Baud Bell 103 standard tones by way of the sound card input.
Basically 300 baud RTTY but with the 103 tones.
However, MixW has the most adjustable parameters for RTTY in a sound card program that I have found.
www.eham.net /forums/Digital/861   (138 words)

  
 Bell 103 definition - Small Business Computing Online Dictionary of IT Terms: Powered by Webopedia   (Site not responding. Last check: 2007-10-29)
Bell 103 definition - Small Business Computing Online Dictionary of IT Terms: Powered by Webopedia
The Bell 103A standard defines asynchronous, full-duplex communication.
Europe and Japan use the CCITT V.21 protocol.
sbc.webopedia.com /TERM/B/Bell_103.html   (76 words)

  
 Modems and Fax Boards - Bell, MNP and CCITT
Bell 103 and 212A are North American standards that specifies the way modems transmit information.
Version 103 applies to asynchronous modems transmitting at speeds up to 300 bps.
Version 212A applies to full duplex asynchronous or synchronous modems that transmit at speeds up to 1200 bps.
developer.intel.com /support/faxmodem/sb/CS-011464.htm   (837 words)

  
 DailyTech - Panasonic to Ship 103-inch Plasma in December 2006
In a move to 1-up itself in the plasma display market Panasonic showcased its 103-inch plasma TV at the New York Stock Exchange yesterday for its Closing Bell.
At 103 inches Panasonic's product will be seen as the world's largest plasma display, for now.
According to the press release Panasonic had to take measures to ensure the same reliability and quality in the 103-inch plasma as is in smaller screens because of the size.
www.dailytech.com /article.aspx?newsid=1855   (827 words)

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