Thrane&Thrane TT-3064A, User Manual

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Appendix E - Tone Signals
15Oct99
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E E - T - T
ONE ONE
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IGNALS IGNALS
In the following the tone signals in the Inmarsat-M system are
defined.
1 2 3 4 5
Busy
Congestion
Out-of-Service
Ringing
6
7
Proceed-to-dial
Figure Figure 6 6 --55: Tone signals : Tone signals
The proceed-to-dial tone consists of 2 continuous tones with
frequencies of respectively 350 Hz and 440 Hz.
The ringing tone is used when the telephone by the called subscriber
is ringing. The ringing tone is used in an outgoing satellite call only.
It is a frequency of 425 Hz, 1.0 seconds ON, 4.0 seconds OFF, 20%
duty cycle.
Please do not mix the ringing tone together with the tone used for an
incoming call. The tone for an incoming call is not a part of the
Inmarsat-M system. It is completely designed by the customer.
The busy tone is used if the called subscriber is busy. It is a
frequency of 425 Hz, 0.5 seconds ON, 0.5 seconds OFF, 50% duty
cycle.
The congestion tone is used if the Inmarsat-M network is congested.
It is a frequency of 425 Hz, 0.25 seconds ON, 0.25 seconds OFF, 50%
duty cycle.
The out-of-service tone is used if the called number is not available. It
is a continuous tone with a frequency of 425 Hz.