Nortel Networks DCT1900 - Manual (Page 188)

Technical Product Manual - DCT1900
Product Specifications, System Boards
6-8 Specs-DCT1900/R8/mw
© 2000-2005
6.11 Line 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