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S
12
E C T I O N
Dial Pulse Address Signalling
D
IALLING
Dial Pulse Signalling is a type of address signalling that uses dial pulses (regular
S
PECIFICATIONS
momentary interruptions) to signal the equipment. In the Xen Alpha system, the
following Dial Pulse specifications are used.
Dual-Tone Multifrequency (DTMF) Address Signalling
DTMF signalling is a term that describes push button or Touchtone dialling. When a
key on a telephone is pushed, two tones (one high frequency and one low frequency)
are provided. In the Xen Alpha system, the following DTMF specifications are used.
Installation Manual, Chapter 1 – System Overview
November 2003, A6-506000-642-01(8508), Release 6.0
Pulse Rate:
10 ± 1 pps/20 ± 2 pps
Percent Break:
60 ± 1.5%
Inter-digit Interval: Break Period – 60 to 70 ms
Make Period – 30 to 40 ms
Frequencies
Two sinusoidal frequencies are provided, one from the high frequency group and
one from the low frequency group.
Frequency Deviation: Less than ±1.5%
Signal Level:
Nominal level per frequency:
Minimum level per frequency:
Maximum level per frequency: 0 dBm
Rise Time: Within 5 ms
Duration of Dual Frequency Signal:
•
110 ms default/60 ms. minimum
Inter-digital Time: 80 ms default/70 ms minimum
Nominal Low Group
Frequencies (Hz)
-22 to 05 dBm
Low Group: -22 dBm
High Group: -22 dBm
Nominal High Group
Frequencies (Hz)
1209
1336
697
1
770
4
852
7
941
1477
2
3
5
6
8
9
0
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