GENERAL ROI-S02775
1-6
1.2 Equipment Performance
The performance characteristics of the IDU are listed in Table 1-1.
Table 1-1 Performance Characteristics of IDU
Data signal interface (between IDU and DTE)
Bit rate: • 2.048 Mbps ±50 ppm (2 MB x 2/2 MB x 4/2 MB x
8/2 MB x 16 system)
• 8.448 Mbps ±30 ppm (8 MB x 1 system)
• 34.368 Mbps ±20 ppm (34 MB x 1 system)
Level: Meets specifications of ITU-T G.703
Code format: High density bipolar-3 (HDB-3)
Impedance: 75 ohms, unbalanced or
120 ohms, balanced
Modulation method: 4-phase shift keying (4 PSK) system
Demodulation method: Quasi-coherent detection
IF signal interface (between IDU and ODU)
Signal frequency
TX: 850 MHz
RX: 70 MHz
Signal level
IF output: −5 dBm, nominal
IF input: −15 to 0 dBm (at , RX IN), varies with cable length
(maximum cable length (8D-FB): l=300 m)
Impedance: 50 ohms, unbalanced
Insertion loss: 15 dB at 70 MHz (l=300 m)
45 dB at 850 MHz (l=300 m)
Orderwire frequency
Output: 468 kHz, amplitude modulation (AM)
Input: 450 kHz, AM
Power supply: −43 V DC (through) at IF IN/OUT
Control/Monitor signal frequency: 10 MHz, amplitude shift keying (ASK) (at IF IN/OUT)
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