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Bell 202
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The Bell 202 modem was an early modem standard developed by the Bell System. It specifies audio frequency-shift keying to encode and transfer data at a rate of 1200 bits per second, half-duplex. It ha
The DEC DF112 from the mid-1980s used the Bell 202 protocol.
The DEC DF112 from the mid-1980s used the Bell 202 protocol.
Bell 103
Videos
The Bell 103 modem or Bell 103 dataset was the second commercial modem for computers, released by AT&T Corporation in 1963. It allowed digital data to be transmitted over regular unconditioned telepho
Bell 202
…standard for amateur VHF operation in most areas. Automatic Packet Reporting System (APRS) transmissions are encoded this way on VHF. On HF, APRS uses Bell 103 modulation. The Bell 202 standard was adopted around 1980 as the communications standard for subsea oil and gas production control systems, pioneered…
The Bell DataPhone 300 used the same protocol as the Bell 103. This modem is from 1978.
The Bell DataPhone 300 used the same protocol as the Bell 103. This modem is from 1978.