Nortel Networks DCT1900 User Manual

Specs-DCT1900/R8/mw

6-7

© 2000-2005

Compliance to Regulations and Standards 
EIA-470

: USA

Environmental
Temperature

Operating

: 32 to 158

°F (0 to 70°C)

Storage

: -40 to 158

°F (-40 to 70°C)

Relative humidity

: 20 to 80%, non condensing

General Specifications
Length x width

13.5" x 7.7" (343 x 195.6mm)

Telephone Line Interface Specifications
Insulation

: 1.5 kVac between line and secondary circuitry
: 1 kVac between line and cabinet

DC Characteristics 
Range of line current

: 10-100mA

On–hook equivalent resistance :  > 1M  between wires a and b for 50 - 250 V

AC Characteristics
On–hook impedance

: > 100 k  for voice signals

> 15 k  for ringing signal

Off–hook impedance

: return loss optimized against 210  + (880  // 150 nF)

Ringing Detection
Ringing voltages

: 10 - 90 Vrms

Frequency range

: > 20 Hz

Pulse Dialing
Waveform

: 60ms pulse, 40ms pulse-USA, Sweden

Selected digit N generates

: N + 1 pulse or

N pulses and digit 0 generates 10 pulses

Resistance during pulsing

:  > 5 M  and < 560

Line voltage

: limited to 100 - 14Vdc

DTMF Dialling 
The DTMF signals are determined by the combination of the SPU and the SICOFI parameters.

Speech Coding
Method

: software selectable

AD Gain

: determined by SICOFI parameters

DA Gain

: determined by SICOFI parameters

Hybrid balance impedance

: determined by SICOFI parameters