bell 103 การใช้

In practice 1200 baud Bell 103 tones, although very little use of AX . 25 on HF exists today.
Bell 101 modems are no longer in use, and were quickly replaced by its successor the Bell 103 modem.
Surplus Bell 202 modems were used by amateur radio operators to construct the first packet radio stations, despite its low Bell 103 modulation.
As the names imply, the later included 1200 bit / s Bell 212 operation in addition to 300 bit / s Bell 103.
The modem for this service was the Bell 101 dataset, which is the direct ancestor of the Bell 103 modem that launched computer time-sharing.