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First, engineering requirements
1, The transmission capacity : Keeping four television programs and four audio signals. Four back to traditional television programs and four audio signals.(Increase in the future only encoder and decoder, and back-Keeping both traditional TV programming can be expanded to the Eighth Route Army and the Eighth Route Army audio signal)
2, 6KM transmission distance, point-to-point transmission.
3, MPEG-2 coding, 45MHz (DS3 Interface) digital transmission.
Second, engineering design
1, Can choose 11GC,13GC or 15GC band microwave.
2, Digital microwave using QPSK modulation, forward error correction (RS, weaving, and volumes organization encoding and decoding)bit error rate of 10-6, as the regularity of films is 6.5 dB higher SNR (RF Receiver threshold up -82dBm)35M occupied bandwidth.
3, Multiplexing and demultiplexing codec using DVB programs, programs to facilitate future increases (up to 8 sets).They can be extracted directly TS, transmitted through microwave coaxial cable or fiber-optic modulator.Low cost, reliable equipment operation, the error-correcting capability, better digital signal indicators.
4, The equipment shown in the following diagram :
Note : ① Be extended to the Eighth Route Army and the Eighth Route Army TV Audio
② ASI interface
③ DS3 switch embedded ASI Protocol Conversion
④ DS3 switch ASI Protocol Converter
⑤ DS3 interface
⑥ 1.4G IF
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