May 2001
System Hardware Manual
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4.6
Dialling Specifications
4.6.1
Dial Pulse Address Signalling
Dial Pulse Signalling is a type of address signalling that
uses dial pulses (regular momentary interruptions) to
signal the equipment. In the Xen system, the following Dial
Pulse specifications are used.
✆
Pulse Rate:
10 ± 0.5 pps/20 ± 1.0 pps
✆
Percent Break:
60 ±ms. ~ 830 ms.
✆
Interdigit Interval:
10 pps/20 pps 770 ms. ~ 830
ms.
#
Dial Pulse is not allowed in New Zealand.
4.6.2
Dual-Tone Multifrequency (DTMF) Address Signalling
DTMF signalling 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 system, the following DTMF specifications
are used.
Table 2-8 DTMF Specifications
Frequencies
Two sinusoidal frequencies are
provided, one from the high frequency
group and one from the low frequency
group.
Frequency Deviation
Less than ±1.0%
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
Rise Time
Within 5 ms.
Duration of Dual Frequency
Signal
110 ms. default/60 ms. minimum
Interdigital Time: 80 ms. default/70 ms.
minimum
