SDH Radio

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SDH Radio
Synchronous Digital Hierarchy
3000 Series SDH Digital Microwave Radio Systems
ITI offers a variety of SDH radio systems for
long-haul , which can be applied as a trunk-link
system connecting switching nodes or backup
system to fiber optics transmission systems.
Short-haul transmission radio , often applied as
access system in urban areas , cover the 18 and
26 GHz band .
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Features
- Conforming to ITU-T , ITU-T and ETSI standard
.
- Compatibility with existing frequency
allocations
- Frequency-efficient modulation scheme
128 QAM for 28 MHz to 30 MHz spacing
64 QAM for 40 MHz spacing
16/32 QAM for 55 MHz spacing
- MLCM (Multi Level Coding Modulation ) for
improved error performance
- TMN (Telecommunications Management Network
) interface compatible with ITU-T
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Features
Continue
- Fading equalizers and space/frequency diversity

configuration as a countermeasure against
fading
- Error-less N1 protection switching
- Wayside traffic and digital service channel
transmission
- Digital XIPC (Cross Polarization Interference
Canceller )
- ATPC (Automatic Trans mission Power Controller )
- PDH (Plesiochronous Digital Hierarchy )
compatible-existing hierarchy interface available
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Technical Specification
Radio Frequency
4 , 5 , U6,7 , 8 , 11 , 13 , 18 ,26 GHz
Channel Separation
40 MHz for 64 QAM
29 MHz for 128 QAM
Modulation
128 QAM and 64 QAM
1.5 to 3 dB ( depend on band)
Noise figure
TX output power
from 29 to32 dBm
20dBm at 18 and 26 Ghz
RX threshold level
-73 dBm at BER 10e-3 for 64QAM
-70 dBm for 128 QAM
Protection configuration
From 10 to 71
2x2Mbit/s for 64 QAM and 1x2Mbit for 128 QAM
Wayside
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ATPC (Automatic Transmitter Power Control)
The ATPC provides the function to automatically
vary the TX power of the Radio SDH equipment
according to the path conditions .
The provision of this function allows
- Reduction of interference to neighboring systems
- Improvement in up fading characteristics
- Improvement in residual BER characteristics
- Savings on power consumption
-Increase life of power amplifier component on
TX
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Function of ATPC
Condition 1, Propagation loss -110dB
RX RSL -50 dBm
TX 20 dBm
TX 30 dBm
RX RSL -50 dBm
Condition 2,Propagation loss -120 dB
RX
TX
BCK
BCK
RX
TX
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Application
1
Long-haul transmission radio covering
3 x STM1
or 3 x 140 Mbit/s
3 x STM1
or 3 x 140 Mbit/s
City B
City A
SDH Radio
SDH Radio
31
31
Each STM1 or 140 MB 1920 telephone channels
3 STM1 or 140 MB 5760 telephone channels
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Application 2
high capacity exchange
Short-haul Trunk for
140 MB
140 MB
Exchange A
Exchange B
SDH Radio
SDH Radio
11
11
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Application
3
Fiber optic backup
4 x STM1
4 x STM1
SDH Radio
SDH Radio
41
41
City A
City B
Fiber optic line