Of: Sichuan Nanchong TV station Strength Bo Nanchong in Sichuan television stations, local news is well received by the audience concerned the program. For the good news columns, Nanchong, Sichuan television to keep investing resources, extensive use of primary information. However, local stations conditions, there is always news of transmission difficulties. Previously under the jurisdiction of six counties in Nanchong Broadcasting Board to Nanchong, Sichuan television transmission material, thanks to cars, trains hand to send with each consuming travel is not that difficult to guarantee the timeliness of news, coupled with news cameras filming county Board species diversity, which often need to send material re-transcription, resulting in decreased signal indicators. Primary transmission of news material become Nanchong, Sichuan television news content to improve information-rich bottleneck limitation. An overview 2000, the three sets of programs to address the city and the province of Taiwan, Taiwan part of the program to download, Nanchong City, built a broadcasting system using optical fiber transmission of the city's SDH (SynchronosDigitalHierarchy) transmission ring network, and is prepared to use this network from the cities and counties Radio and Television Council Network Room return to the City, Taiwan News. As the return is still the analog video and audio signals, in addition to sending and receiving side terminals must be equipped with optical transceiver and decoding equipment, the city of Taiwan also equipped with video and audio matrix and the duty to send your hand, a large capital investment, low efficiency, very meet the high efficiency of the news program Make . System this year, Nanchong, Sichuan television broadcast networks, media, information systems have been built, non-linear editing system in the County Broadcasting, also widely used. Nanchong, Sichuan television as an opportunity to invest in equipment without inc reasing the county bureau cases, relying on SDH transmission network of multi-service characteristic, counties in Nanchong, Sichuan Bureau of production networks and information systems of the Internet television media. 6 counties (cities) in the upload program NLE On format, the program adopted by the network to transmit data files, effectively solve the problem of transmission of news material. 2 Network Architecture Network architecture County Bureau of radio and television equipment, Windows2000 system using a computer (as shown in Figure 1, "From Gateway"), system configuration requirements are as follows: * P4 2.0GHz or above CPU ; * 256MB Memory ; * 40GB or more Hard disk . System to dual-LAN, a network card and connected to the internal production and broadcast systems, and the other an SDH ring network card and Ethernet backplane interface to connect, and install a unified media information software, which specifies the storage database (capital city of Taiwan media array cabinet). City, Taiwan media information Server Also installed dual LAN, a network card connected to the internal LAN and another one with the connection interface board of county SDHEthernet Switch Connected. SDHEthernet interface board connected to the network card's IP address assignment in the same segment, so that six counties this workstation and the capital city of Taiwan media servers to form a network of long-range return. County, Taiwan, return the media capital program must be running the software, add in the material implementation of the task bar, then add the stream has been generated good ES MPEG II (IBP) format, can be automatically uploaded and automatically saved in the media capital of the database server specified. City, Taiwan media capital separate the part of the hard disk array cabinet space, for the counties to establish special directory, county radio stations upload MpegIIES stream of material stored in this directory, upload material by sof tware to facilitate uniform cataloging television stations Nanchong material retrieval and management. From broadcast program be finished the way with another storage server can directly broadcast into the air, be re-processed material is transferred through the network code point to convert non-compiled format can be used in workstations for editing to ensure that the City Desk of the uploaded material for the management and use. 6 counties since the use of non-code system is not the same as the balance between video quality, transmission speed and data compatibility, determine the county Board uploaded material uniformly applied MPEGII (IBP) ES of the compression format, the stream Make 8Mbps (to the quality of Betacam-sp) case, the per minute video program generates about 60MB of data files (audio files, video comparison relatively small, ignored). Through the SDH network, cities and counties the flexibility to allocate the bandwidth Ethernet interfaces, the transmission time in case there are no special requirements, we temporarily assign each interface to 4Mbps bandwidth, program upload time is about 1:2.5. Transmitted by this program do not need an appointment, responsible for municipal units do not need your hand to ensure that the county Shangwang timeliness of delivery of programs, truly a 24-hour delivery, accompanied by six counties and cities their Welcome. Three security mechanisms * City, Taiwan media owned servers and workstations are dual-county bureau upload card configuration, without changing the original structure cities and counties and local area network settings, the second network card and SDHEthernet connected to the different distribution of the same network segment IP (example: 192.168. 0.10-192.168.0.17). Dual card mode, can not Router Reduce costs, both to avoid the conflict of the IP network, but also avoid the other hosts on the LAN between the inter-visit, to ensure security within the network. * Connection SDHEt hernet the switch to use the switch with VLAN isolation between counties and upload station visit. * Use a strong media network management information system capabilities, only allows the system administrator to add the equipment and the user can access media information systems, to prevent other users of other computer network access to upload. Strong security policies using Windows2000server to upload workstation can only access the upload directory dedicated to refuse access to other directories, to prevent the media information in other directories and information exposure. * City, Taiwan media information between the server and SDH Ethernet settings Fireproof Wall, fully guarantee the safety of production and broadcasting network. * In the transmission, since SDH is protected with a self-healing ring network structure, can effectively prevent the transmission medium is cut off, communication services all the termination occurs, any point in the ring will not affect the transmission interruption of normal, its physical reliability trusted. We have six counties in the Ethernet distribution channels to achieve a fixed-bandwidth Ethernet services end to end bandwidth guarantee, complete line of interconnect Ethernet, and SDH transmission network to show the rest of the business strictly separate to avoid the Internet business of the infection, to ensure the safe operation of production and broadcasting network. After several months of actual operation, county bureau with the city's programs in exchange for full implementation of the free zone, and to prevent multiple copies of the program due to lower signal indicators
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