answer-meter signal off-hook signal answer signal undisturbed response signal
start signal starter s bell starting signal nought output signal
zero output zero output signal undisturbed zero output read output
read output signal undisturbed one output undisturbed output signal one-output signal
one output signal selection signal spacing signal sign flag
line sync pulse line sync signal line synchronizing pulse line synchronizing signal
frame adjustment signal frame synchronization signal framing signal frame alignment signal
distress signal call request signal supervisory signal timing signal
clear forward signal end-of-pulsing signal seizing signal seizure signal
threshold marking runway threshold marking urgency signal video signal
composite video signal touchdown zone marking down-link signal sensor signal
referee s signal assistant referee s signal runway designation marking digital signal
n-ary digital signal distorted signal electro-magnetic signal electromagnetic signal
electronic beep signal ground signals spurious signal fixed signal
hydrographical signal radio time signal carriageway marking lane marking
pavement marking pavement surface marking road marking roadway marking
surface marking horizontal marking barred signal disabling signal
inhibiting signal line tilt correction mark bias octonary signaling
field bend correction line bend line bend correction interfering signal
group reference pilot synchronizing pilot plesiochronous signal mandatory sign
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