Specifications

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AS/CA S002:2010 COPYRIGHT
OCTOBER 2010
D.2.4 Cadences
Figure D1 shows the cadences for the eight ring patterns. All Ring
and Silent Interval durations are in multiples of 200 ms. The cycle
time for all cadences is 3 s.
Note 1: The Distinctive Ring signals described in this diagram are those provided by Telstra.
Consult other carriers for possible variations.
Note 2: The diagram does not show the initial (immediate) burst of ring (Early Guard) which
precedes the modem transmission (if required for Calling Line Identity Presentation)
and these ring cadences. The duration of this initial burst can be in the range
400 ms to 800 ms at some exchanges where Distinctive Ring is implemented. If no
modem transmission is required, there will be at least a 200 ms silent interval
between the Early Guard and the first burst in the ring cadence.
FIGURE D1 28
Distinctive ring cadences