| Along with mobile communications network development, the microwave SDHsystem was widely applied by its big capacity, good transmission performance andconvenient network nimble. But in certain transmission situations, capacity is not bigenough, the SDH superiority is unable to display. On the contrary, the PDH system,because its capacity is moderate, the disposition is flexible, the cost is inexpensive andthe function is complete, has the certain superiority and status in the wirelesstransmission network construction.Whether it’s in the mobile base station or in the engine room, thetelecommunications sector has provided a wealth of G.703E1interface resources.Meanwhile, the growing popularity of the Internet makes IP data services become moremainstream business. Telecommunication operators are facing the challenge ofaccomplishing telecommunication link bearers for data services by fully exploiting theadvantages of current E1lines. Therefore, the study different types of communicationinterface between the network conversion, thus making the packet-based Ethernet andTDM-based circuit-switched telecommunications network merging, has become animportant research topic.This thesis is just in the above background and in the basis of PDH multi-servicedigital microwave transmission system. After describing the basic multi-service digitalmicrowave theory and introducing the key technologies which means the conversionbetween the two business, the article proposes the conversion of E1/Ethernet adapterblock diagram of the overall design and the scheme of data processing on the use ofmicrowave transmission system IDU’s two business units disc characteristics. Then, thepaper focuses on the completion of the multi-service interface functional modules in theFPGA logic design and implementation and in this way accomplished Ethernet datatransmission in E1transparent channel. The test result gained in practical environmentshows the scheme has better performance and potential applications in practical. |
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