NEC ElectraElite 48, System Hardware Manual

Page: 92 / 435

Electra Elite Issue 6
System Hardware Manual 2 - 13
AP(A)-R Unit
Standard 2500 Set: 500 type network
Nominal Current: 30 mA
AP(R)-R 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 to signal
the equipment. In the Electra Elite 48 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 770 ~ 830 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 48 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.