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The Bell 212A scheme was the most common standard used for 1200 bit/s transmission on US data networks such as CompuServe during the 1980s and 1990s, when dial-up access to time-sharing services was the norm, and, starting in 1989, dial-up Internet access.
The DEC DF112 from the mid-1980s used the Bell 202 protocol. The Bell 202 modem was an early (1976) modem standard developed by the Bell System. It specifies audio frequency-shift keying (AFSK) to encode and transfer data at a rate of 1200 bits per second (bit/s), half-duplex. It has separate sets of circuits for 1200 bit/s and 300 bit/s rates. [1]
The back of a Teletype Model 33 teleprinter with a Bell 101C Data Set in the pedestal, 1963.. The Bell 101 Data Set was the first commercial modem for computers, released by AT&T Corporation in 1958 for use by SAGE, and made commercially available in 1959, shortly after AT&T's Bell Labs announced their 110 baud modulation frequencies.
If you change this default setting, you can activate PRIVATE WiFi at any time clicking on the status icon (PC: right-click the icon in the Taskbar at the bottom right of your screen, Mac: click the Menu Bar icon at the top right of your screen) and selecting Activate. To deactivate PRIVATE WiFi, click on the Menu Bar icon and select Deactivate.
Pages in category "Bell System modem standards" The following 4 pages are in this category, out of 4 total. This list may not reflect recent changes. B. Bell 101 modem;
Most early telephone-line modems used audio frequency-shift keying (AFSK) to send and receive data at rates up to about 1200 bits per second. The Bell 103 and Bell 202 modems used this technique. [15] Even today, North American caller ID uses 1200 baud AFSK in the form of the Bell 202 standard.
The 103 modem would eventually become a de facto standard once third-party (non-AT&T) modems reached the market, and throughout the 1970s, independently made modems compatible with the Bell 103 de facto standard were commonplace. [7] Example models included the Novation CAT and the Anderson-Jacobson.
The telephone company usually has the ability to remotely activate loopback, without even needing personnel at the customer site. When looped back, the customer equipment is disconnected from the line. Additional smartjack diagnostic capabilities include alarm indication signal, which reports trouble at one end of the line to the far end. This ...