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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Raby Castle vs Middleton in Teesdale RABY CASTLE: M Dent c Fletcher b Bell 103, S Lee retired hurt 102, D Lee c Iverson b Dent 29, G Walton not out 29, J Forster b bell 2, J Dent not out 26.
Warren Yoder 476 (187), Haith 517 (184), Zeni 230 (131), Gregerson 635 (217), Faje 601 (241), Bell 103 (103).
The new modems are also compatible with modems utilizing ITU-T V.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.