NEC Electra Elite 192, Hardware Manual

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Issue 6 Electra Elite
2 - 12 System Specifications
APR-U Unit
Standard 2500 Set: 500 type network
Nominal Current: 30 mA
Ring Signal: 56 Vac RMS @ 20 Hz
4.6 Dialing Specifications
4.6.1 Dial Pulse Address Signaling
Dial Pulse address Signaling uses dial pulses (regular
momentary interruptions) to signal the equipment. In the
Electra Elite 192 system, the following Dial Pulse
specifications are used.
Pulse Rate: 10 ± 0.5 pps/20 ± 1.0 pps
Percent Break: 60 ± 1.5%
Interdigit Interval: 10 pps/20 pps 500 ms. ~ 800 ms.
4.6.2 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 192 system, the following
DTMF specifications are used.
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