sdh a 中文意思是什麼

sdh a 解釋

  • sdh : SDH ＝synchronous digital hierarchy 【電信】同步數字式程序。
  • a : an 用在以母音音素開始的詞前〉 indefinite art 1 〈普通可數名詞第一次提到時，冠以不定冠詞主要表示類...
  1. Recently, several key - exposure - free chameleon hashes have been constructed based on rsa assumption and sdh strong diffie - hellman assumption. in this paper, we propose a factoring - based chameleon hash scheme which is proven to enjoy all advantages of the previous schemes

    更具體地講，變色簽名的構造遵循了著名的先哈希再簽名的範例hash - and - sign paradigm ，但是稍有不同
  2. With the expansion of exchange capacity and network convergence, quite a lot of manufacturers has installed built - in sdh interfaces in their switches so as to provide trunk modules of the stm - 1 ( 155 mbs ) rate, such as shanghai bell s p3s exchange and huawei s c & co8 exchange

    隨著交換機容量的擴大和網路融合的趨勢，目前已經有相當多的廠家都內置了sdh的介面，能夠提供stm - 1 （ 155mbits ）速率的中繼模塊，具體如上海貝爾的p3s交換機和華為公司的c & c08交換機。
  3. At present, ip based network is becoming more and more popular in daily life and commercial operation. however, the traditional sdh equipment could not provide high speed and low cost data service and it ' s not economical of investing too much on new equipment and withdrawing the primary investment. furthermore, the entire digital network cannot fulfil the existing traditional operation. so how to inosculate ip based data network and sdh network becomes a very inportant and pratical technology

    現在，應用ip技術的數據網路在日常生活和商業運作中變得越來越普遍，而傳統的sdh設備不能提供高速率、低成本的數據業務；同時要對新設備進行可觀的投資和撤出對現有sdh設備的投資，把sdh網路重組成一個純數據網路也不經濟；而且純數據網路不能經濟地實現現有的傳統業務，如固定帶寬的租用線業務和話音業務。
  4. Chongqing expressway networking toll data communication network cotains 2 - ring and 8 - ray network structure based on expressway physical structure, setting up a trasmission trunk layer of sdh stm - 4 ( can be up - graded to stm - 16 ), and channel protection business entry layer consisting of sdh onu / olt stm - 1 ( can be up - graded to stm - 4 ). data exchange layer, through ip route exchange network above sdh network, forms 3 - level computer network structure of account settlement center - road section management company - toll station. to ensure obtaining original and reliable toll data from communication network, 2m circuitous chain is established between each toll station, accountsettlement center and road section management company, and also pstn dialing backup chain is set up between toll station and account settlement center. in order to maintain clock synchronization of the whole communication network, a proposal of sub - stage clock sychrononization signal network for differet network construction scale has been put forward in this design. in view of sensitivity and importance of toll data, this design particularly gives considerations of network safety and information safety for external and internel of network. therefore, communication safety, smoothness and reliability of networking toll system can be able to maintained in many ways

    重慶高速公路聯網收費數據通信網的結構是根據高速公路的物理結構構築了2環8射的網狀結構，建立了以sdhstm - 4 （可升級到stm - 16 ）的傳輸主幹層，以sdhonu / oltstm - 1 （可升級到stm - 4 ）組成的通道保護業務接入層。數據的交換層是在sdh網之上的ip路由交換網，形成了結算中心-路段管理公司-收費站之間的3級計算機網路結構。為從通信網路上保證收費數據的原始性和可靠性，每個收費站和結算中心、路段管理公司之間建立了2m迂迴鏈路，同時在收費站和結算中心之間建立了pstn的撥號備份鏈路。
  5. In this thesis, principles of data coding for transferring data among different network hierarchies is described, a channel and program management center and a user authorization center are designed, and the integration and application of the system into sdh / hfc network are investigated and implemented

    本文對系統中支持不同網路體系間數據格式的轉換的數據編碼原理進行了描述。設計了該系統頻道和節目管理中心以及用戶授權管理中心的構架，並對高速數據廣播系統在sdh hfc網路中的集成和應用進行了較為深入的研究。
  6. By adopting qam ( quadrature amplitude modulation ) modulation, we have researched and implemented a high - speed data broadcasting system compatible with dvb ( digital video broadcasting ) standard in the past years, and integrated and applicated the system into sdh / hfc ( synchronous digital hierarchy / hybrid fiber coax ) network for the first time in china

    經過多年的研究，開發出了符合dvb標準、採用qam調制方式的陽光網高速數據廣播系統，同時在國內首次實現了基於sdh hfc網路的高速數據廣播系統集成應用。
  7. This item, a basic part of sdh communication product, is to work as a normal router, that is, to take on the operation of transmitting data packets in special network

    本項目是公司sdh通信產品中的一個組成部分，目的是實現基本路由器功能，在專用網中承擔數據包轉發的業務。
  8. Ccc owns a public telecommunication network dwdm sdh and has established six regional communication hub centres which are located in beijing, shanghai, chongqing, shenzhen, xian and harbin. with various public communication networks interconnected and resources shared via the hub centres, ccc is able to provide its customers with quality telecommunication services

    在北京上海重慶深圳西安及哈爾濱等六個節點城市建有通信樞紐中心，通過樞紐中心與各公眾通信網路互聯互通資源分享，為廣大用戶提供優質的電信業務服務。
  9. In order to adapt to different implementation, linux has been modified and refined to be a specific embeded system. the implement of an sdh adm control platform based on the embeded system, which is used to configure the adm and accomplish the timeslot configeration 、 overhead insertion 、 loopback configeration 、 mapmode configeration 、 mode selection and reset etc., is introduced in this dissertation

    論文介紹了一種基於嵌入式系統的「 sdh專用分接器控制平臺」實現方案，可通過網路在線配置sdh專用分接器，完成時隙配置、開銷插入配置、環回配置、映射模式配置、模式選擇、晶元復位控制等功能。
  10. Owing to fact that at present 155 mbits and 2 mbits trunks coexist in the switching network and the latter has a larger share, and traffic has to go through several sdh rings in the transmission network, it is necessary to develop stringent management procedures in configuring the circuits and carry out all - length tests

    由於目前交換網155mbits中繼和2mbits中繼並存，並且仍以2mbits為主，在傳輸網路中要通過多個sdh環，在配置電路時，要有嚴格的管理程序，在傳輸生成電路時，全程測試是不可忽視的環節。
  11. Apon is a passive optical network where atm is adopted to transmit broadband and narrowband cells via the sdh frame structure. the service node interface is stm - n. the statistical multiplexing feature of atm enables a concentrated transmission of broadband services in apon

    Apon是在無源光網路中採用atm傳送技術，利用sdh幀結構傳送各種寬帶和窄帶業務的信元，業務節點介面採用stm - n介面。
  12. The dissertation ’ s emphasis is on the research of a sdh multiplexer which can be used in specific field of sdh transmission network

    本論文主要研究滿足特定應用場合要求的sdh分接器，屬于sdh網元，在此稱為sdh專用分接器。
  13. Siemens, lucnet, ciena, zte and huawei also poured in handsome resources to evolve the single - wave 2. 5gbits sdh equipment to a high - end, large - capacity network exchange, with the processing capacity doubled semi - annually

    5gbits容量的sdh設備朝著大容量、可交換的高端網路產品發展，每半年就推出處理能力翻一番的新設備。
  14. On physical layer, it consists of a variety of ne ( network elements ) with different functions connected by optical fibre cables. compared with pdh, sdh is more widely used in fibre optical communication system these days. the reasons of the wide applicability of sdh are : first, it provides worldwide standards for electrical interface and optical interface, which can promote multi - vendor interoperability ; second, it has the feature of synchronous multiplexing and flexible mapping mechanism, so it can use stm - 1 signal to bundle atm cells, fddi signals as well as pdh signals

    Sdh之所以具有強大的生命力和廣泛的適應性，主要有兩個原因:提供統一標準的光介面和電介面，使不同廠家設備實現橫向兼容;採用同步復用方式和靈活的映射結構，以基本傳輸模塊stm - 1為橋梁，與原有的pdh信號實現縱向的前向兼容，與atm 、 fddi等數字體制實現後向兼容。
  15. To realize the multi - service transport ability in metro wdm networks, we have built a platform based on sdh / wdm in chapter 3. the platform composes of sdh & wdm equipments at two nodes which connected by only one 50km sm fiber. some vlan modules are inserted, and the sdh forms a single - fiber bidirectional lan to transport ip service. some coders / decoders of video are connected to the modules to finish the video service transport

    在第四章，我們提出兩種保護方案： sfvpp保護方案充分利用光纖的波分復用特性，針對復雜的網路結構，把不同波長通道業務劃分成不同虛拓撲（虛環網） ，綜合利用wdm環網光層保護策略，實現網路中不同的環網綜合保護。
  16. A unified and large - capacity multi - service transport platform should support multiple protocols and transport mixed traffic, thus necessitating marked changes in the traditional sdh technology and equipment

    採用統一的、大容量、多業務傳送平臺來支持多種協議和傳送混合業務，這就要求傳統的sdh技術和設備要有較大的變化。
  17. However, survivable technology in all transport network ( otn ) is different from sdh because the former handle optical signal and the latter handle electrical signal. a lot of problem of survivability in otn need to be solved

    然而由於全光傳送網處理的是光信號，以具有模擬特徵的波長為單位，使得全光傳送網的生存性技術與比較成熟的sdh生存性技術相比，有了許多新的特點，有許多問題期待解決。
  18. In addition, the simple sdh multiplexer has special use because of its small and exquisite character. the e1 multiplexer which the dissertation focuses on is a subsystem of the 2. 5g terminal multiplexer ( the specific demultiplexer of sdh ). its function is tapping e1 signal from stm - 1 and multiplexing e1 signal into stm - 1

    本文所研究的e1映射復用模塊，是2 . 5g終端復用器（ sdh專用分接器）的一個子系統，它所實現的功能就是從stm - 1中分接出e1信號以及把e1信號復用進stm - 1 。
  19. If the sdh network can carry atm and ip services, a unified network and technology would be in sight to resolve the problem of multi - service transport. as a result, telcos would become the ultimate beneficiary. 2

    若sdh網路能夠承載atm 、 ip網路所承擔的業務，以一個統一的網路和技術來解決多種業務的傳送問題，則可使電信運營商從多方面獲益。
  20. With the principle and method in this paper, a general functional model of sdh fiber communication training simulation system is established, the universal model of simulation system is reasonable

    在該思想中歸納的建模原則和建模規范的指導下，對sdh光纖通信訓練模擬系統建立總體功能模型，說明該通用模型思想的合理性。
分享友人
分享到 Line

分享到臉書