May 2001
System Hardware Manual 2 - 27
A6-324000-642-01 – Release 4.0
May 2001
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
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