Nortel Networks DCT1900 사용자 설명서
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
EIA-470
: USA
Environmental
Temperature
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
Length x width
13.5" x 7.7" (343 x 195.6mm)
Telephone Line Interface Specifications
Insulation
Insulation
: 1.5 kVac between line and secondary circuitry
: 1 kVac between line and cabinet
: 1 kVac between line and cabinet
DC Characteristics
Range of line current
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
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
Ringing voltages
: 10 - 90 Vrms
Frequency range
: > 20 Hz
Pulse Dialing
Waveform
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.
The DTMF signals are determined by the combination of the SPU and the SICOFI parameters.
Speech Coding
Method
Method
: software selectable
AD Gain
: determined by SICOFI parameters
DA Gain
: determined by SICOFI parameters
Hybrid balance impedance
: determined by SICOFI parameters