Bell 103

Bell 103

(protocol)
The original variant of V.21 created by AT&T when they had a telephone system monopoly in the USA.

Bell 103

An AT&T standard for asynchronous 300 bps full-duplex modems using FSK modulation on dial-up lines.
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References in periodicals archive ?
Warren Yoder 476 (187), Haith 517 (184), Zeni 230 (131), Gregerson 635 (217), Faje 601 (241), Bell 103 (103).
32bis protocol from 14,400bps down to Bell 103 at 300bps.
This is Bell 103 at 300 bps and Bell 212 A at 1200 bps.
7V, the versatile ISD61S00 can perform a range of powerful telephony-based communications functions, such as the detection and generation of both dual-tone multi-frequency (DTMF) signaling and frequency-shift keying (FSK) for Bell 103, Bell 202 or V.
In contrast, designers can use the new PSoC modem configuration, combined with a minimal amount of external passive circuitry, to create a Bell 103 and V.
21 - Bell 212A, Bell 103, Bell 202, Bell 202T - FSK (V.