Nortel Networks DCT1900 - Manual (Page 87)

Technical Product Manual - DCT1900
Product Specifications, System Boards
Specs-DCT1900/R8/mw 6-7
© 2000-2005
6.10 Line Termination Unit, LTU - REX-BRD0007 or ROFNB 157 02/06
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