NEC PASOLINK+, Manual

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PASOLINK
+
155 MB 1+0/1+1 SYSTEM MTD-PL-028/141005
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5.4 Indoor Unit (IDU)
The IDU consists of six (6) panels that have following functions. (Figure 4-1)
1. ODU INTFC
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Performing the multiplexing/demultiplexing of the transmitting signal, receiving signal, SV and
EOW signal
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Compensating the signal loss depending on IF cable length
•
Automatic Gain control
2. 32 QAM MODEM / 128 QAM MODEM
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32/128 QAM (Quadrature Amplitude Modulation), Modulator/Demodulator
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Compensating quality degradation caused by fading
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Error correction of burst error using the Reed –Solomon encoding/decoding
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MLC (Multi Level Code) encoding/decoding. (Only for 32-AM)
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Data streams conversion depending on the modulation scheme
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Scrambling/de-scrambling of the data
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RFCOH multiplexing/demultiplexing
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Velocity conversion for radio frame
3. 150M INTFC / OPT INTFC / 10/100 BASE-T(X) INTFC (Selectable)
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STM-1 signal interface (150M INTFC / OPT INTFC)
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RSOH multiplexing/demultiplexing (150M INTFC / OPT INTFC)
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Hitless switching of No.1 and No.2 receiving signal (150M INTFC / OPT INTFC)
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2 ports 10 BASE-T/100 BASE-TX INTFC (Each port traffic is separated) (10/100 Base-
T(X))
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Transparency for VLAN (IEEE 802.1Q Tagged frame) (10/100 Base-T(X))
4. CTRL
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Setting of equipment operation
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Monitoring alarm status of the equipment
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Performing performance monitoring
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Providing upper rank NMS interface
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LCT terminal interface
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EOW interface
5. WS INTFC (option) (32-QAM option)
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Interface of 2048/1544 kbps Wayside signal
6. LAN CARD (Option)
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Ethernet interface (10 Base-T) card with bridge function (exclusive use against WS
interface)