bell-code signaling

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• Signaling System No. 5 — CCITT5 [http://www.itu.int/rec/T REC Q.140 Q.180/en ITU T Recommendation Q.140 Q.180] Specifications of Signalling System No. 5] was a multi frequency (MF) telephone signalling system in use from the 1970s for International Direct Distance… …   Wikipedia

• Dual-tone multi-frequency signaling — One of the few production telephone DTMF keypads with all 16 keys, from an Autovon Telephone. The column of red keys produces the A, B, C, and D DTMF events. Dual tone multi frequency signaling (DTMF) is used for telecommunication signaling over… …   Wikipedia

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• Timeline of electromagnetism — The timeline of electromagnetism, that is the timeline of the human understanding of electromagnetic forces, dates back over two thousand years ago. It lists, within the history of electromagnetism, the associated theories, technology, and events …   Wikipedia