Nortel Networks DCT1900 manual Line Termination Unit , LTU2 REX-BRD0019A

Technical Product Manual - DCT1900

Product Specifications, System Boards

6.11Line Termination Unit , LTU2 - REX-BRD0019A

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 7.6" x .8" (344 x 192 x 20 mm)
Weight	.95 lb (430 grams) (excluding packaging)

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	:	60 mA max.
On–hook equivalent resistance	:	> 9 M between wires a and b for 200 Vdc
Resistance to earth (in quiescent
and loop state)	:	1 G between wires a/b and E-wire for up to 250 Vdc
AC Characteristics
On–hook impedance	: Software programmable 600			or complex
Off–hook impedance	: See ’Ringing Detection’
Return Loss	:	15 dB min.
Relative levels	:	Software programmable
Input (AD loss) range	:	6 to -11dBr against 270	+ (750 // 150 nF)
Output (DA loss) range	:	12 to -4.5 dBr against 270	+ (750		// 150 nF)
Balancing impedance	:	Software programmable; 600		, 900	or complex
Longitudinal conversion loss	:	60 dB min. between 50 Hz and 4 KHz
Ringing Detection
Ringing voltages	:	10 k min. between 24 to 90 Vrms, 25 to 50 Hz
Impedance for voice signals	:	100 k min. at AC voltages up to 2 V (peak),300 Hz to 3400 Hz
Capacity	:	1 μF +/- 5%
Ringing voltages	: 24 to 120 Vrms
Insensitive to signals	:	17 Vrms max.
Frequency range	: Software programmable between 16 and 64 Hz
Pulse Dialing
Make/break period	: Software programmable between 0 to 255 ms
Selected digit N generates	: N pulses and digit 0 generates either 10 pulses (default)
Line Voltage during pulsing	:	Limited to 240 Vdc

6-8	Specs-DCT1900/R8/mw
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