Product manual

Product specifications, System boards
Technical Product Manual - DCT1800-GAP
TD 92093 (1/LZBNB 103 108 R4D) / 2006-03-09/ Ver.C
© 2006
12
Return loss : 15 dB min.
Relative levels: : Software programmable
Input (AD loss) range : 6 to −11 dBr against 270 Ω + (750 Ω // 150 nF)
Output (DA loss) range : 12 to −4.5 dBr against 270 Ω + (750 Ω // 150 nF)
Balancing impedance : Software programmable; 600 Ω, 900 Ω or complex
Longitudinal conversion loss : 60 dB min. between 50 Hz and 4 kHz
Ringing detection
Impedance : 10 kΩ min. between 24 to 90 Vrms, 25 to 50 Hz
Impedance for voice signals : 100 kΩ 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 dialling
Make/break period : Software programmable between 0 and 255 ms
Selected digit N generates : N pulses and digit 0 generates either 10 pulses (default) or N + 1
pulses (Sweden)
Line voltages during pulsing : Limited at 240 Vdc
DTMF dialling
Level : Software programmable by a combination of the output level of
LTU and SPU parameter
Recall signalling
Timed break signalling : Software programmable break; between 0 and 2550 ms in steps
of 10 ms
Earth signalling : Software programmable connection of a-wire to LTU/MCCB
ground cable; between 0 to 2550 ms
Speech coding
Standard : G.712
Method : 64 kbit/s A-Law or μ-Law PCM
5.2 Digital Trunk Unit T1, DTU-T1 – REX-BRD0021 (2/ROFNB 157 13/2)
Same as DTU-E1 but is operating on 1.544 Mbit/s. For further specifications refer to paragraph 5.3.
5.3 Digital Trunk Unit E1, DTU-E1 – REX-BRD0003 (2/ROFNB 157 13/6)
Compliance to regulations and standards
The DTU-E1 provides 2 standard CEPT primary rate interfaces. The DTU-E1 complies with the
following CCITT recommendations:
G.703 : Electrical characteristics of the 2.048 Mbit/s synchronization
interface
G.704 : Synchronization frame structure at 2.048 Mbit/s
G.823 : Input jitter requirements
G.732 : Characteristics of primary rate PCM multiplex equipment
operating at 2.048 Mbit/s