Dual-Tone Multifrequency (Dtmf) Address Signaling - NEC Electra Elite IPK II General Description Manual

Electra Elite IPK II
9.2
General Description Manual

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.
Frequencies
H
Two sinusoidal frequencies are provided, one from the high frequency
group and one from the low frequency group.
Frequency Deviation: Less than ±1.0%
H
Signal Level:
H
Nominal level per frequency:
Minimum level per frequency:
Low Group:
High Group:
Maximum level per frequency: 0 dBm
Rise Time: Within 5 ms.
H
Duration of Dual Frequency Signal:
H
110 ms. default/60 ms. minimum
Interdigital Time: 80 ms. default/70 ms. minimum
H
Nominal Low Group
Frequencies (Hz)
-6 ~ -4 dBm
-10 dBm
-8 dBm
Nominal High Group
Frequencies (Hz)
1209 1336
697 1 2
770 4 5
852 7 8
941 , 0
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