NEC ELECTRA ELITE IPK II, Руководство по аппаратному обеспечению системы, Страница: 63 / 642

Electra Elite IPK II Document Revision 3
System Hardware Manual 3 - 29
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5.6 Dialing Specifications
5.6.1 Dial Pulse Address Signaling
Dial Pulse address Signaling uses dial pulses (regular momentary
interruptions) to signal the equipment. In the Electra Elite IPK II
system, the following Dial Pulse specifications are used:
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Pulse Rate: 10 ± 0.5 pps/20 ± 1.0 pps
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Percent Break: 60 ± 1.5%
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Interdigit Interval: 0 pps/20 pps 500 ms. ~ 800 ms.
5.6.2 Dual-Tone Multifrequency (DTMF) Address Signaling
DTMF signaling 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:
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Frequencies
Two sinusoidal frequencies are provided, one from the high
frequency group and one from the low frequency group.
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Frequency Deviation: Less than ±1.0%
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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
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Rise Time: Within 5 ms.
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Duration of Dual Frequency Signal:
110 ms. default/60 ms. minimum
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Interdigital Time: 80 ms. default/70 ms. minimum