Nortel Networks DCT1900 manual Line Termination Unit, LTU REX-BRD0007 or Rofnb 157 02/06

Technical Product Manual - DCT1900

Product Specifications, System Boards

6.10Line 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

Specs-DCT1900/R8/mw	6-7
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