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
697 123
770 456
852 789
941
,
0#
Nominal Low Group
Frequencies (Hz)
Nominal High Group
Frequencies (Hz)
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