1) передача сигналов
2) сигнализация
3) вызов ( в телефонии )
4) телеграфирование
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- ac signaling
- addressed signaling
- alarm signaling
- associated signaling
- automatic block signaling
- automatic signaling
- automatic train signaling
- bandlimited signaling
- baseband signaling
- block signaling
- cab signaling
- carrier signaling
- common-channel signaling
- compelled signaling
- dc signaling
- digital signaling
- distress signaling
- en-block signaling
- end-to-end signaling
- error-control signaling
- fault signaling
- frequency signaling
- frequency-exchange signaling
- frequency-change signaling
- fully dissociated signaling
- generator signaling
- harmonic signaling
- idle signaling
- in-band signaling
- in-slot signaling
- lamp signaling
- link-by-link signaling
- multifrequency signaling
- multiple-aspect signaling
- nonassociated signaling
- on-off signaling
- out-of-band signaling
- out-band signaling
- out-of-slot signaling
- out-slot signaling
- partial-response signaling
- remote signaling
- route signaling
- selective signaling
- single-direction automatic block signaling
- speed signaling
- spurt signaling
- station signaling
- three-aspect signaling
- tone-on-idle signaling
- track block signaling
- track-circuit controlled signaling
- train signaling
- wayside signaling