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Electra Elite IPK II
Document Revision 1
General Description Manual
5 - 17
9.2
Dual-Tone Multifrequency (DTMF) Address Signaling
DTMF signaling is a term that describes push button or Touchtone dialing.
When a key on a telephone is pushed, two tones (one high frequency and one
low frequency) are provided. In the Electra Elite IPK II system, the following
DTMF specifications are used.
H
Frequencies
Two sinusoidal frequencies are provided, one from the high frequency
group and one from the low frequency group.
H
Frequency Deviation: Less than ±1.0%
H
Signal Level:
Nominal level per frequency:
-6 ~ -4 dBm
Minimum level per frequency:
Low Group:
-10 dBm
High Group:
-8 dBm
Maximum level per frequency: 0 dBm
H
Rise Time: Within 5 ms.
H
Duration of Dual Frequency Signal:
110 ms. default/60 ms. minimum
H
Interdigital Time: 80 ms. default/70 ms. minimum
1209
1336
1477
697
1
2
3
770
4
5
6
852
7
8
9
941
,
0
#
Nominal Low Group
Frequencies (Hz)
Nominal High Group
Frequencies (Hz)
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