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Signalling Systems Specifications

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A OTMF en oder/decoder and auxiliary equipment should be supplied for
each base station and remote operating position, such that:

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a) A speaker muting switch will allow the operator to mute his
monitor speaker by at least 30 dB, or to return it to full volume,

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When another station transmits a DIMF code for this Station, a
code for the group which includes this station, or an all-cal]
code, this station's decoder will un-mute the monitor speaker,

will ‘light a call- indication lamp, and will sound a high- volume
audible alarm, a |

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A reset switch will allow the operator to reset the decoder and
restore the normal state,

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The DTMF encoder and keypad will enable the operator to alert any
Single station, a specific group of stations, or all Stations, as
necessary.

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Removal of microphone from microphone hook will return. speaker to.
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