pdh 中文意思是什麼

pdh 解釋
光纖準同步數字
  1. The local network resoure management system is mainly engaged in the lacal network resoure management, at the same time and the network quality managerment as well, also including network line - pipe management, equipment management, configure management, topology management, attemper management and systimatic analysis, the main equipments include pdh, sdh, dwdn, idlc, pon, fwa, adsl, bits etc. by means of the main equipments " s resoure attemper and running state, we can finds out something abnornal in operation, from the whole point of local network, adjusting network is to be made to reach overal optimiztion. ensuring the network operating quality, realizing the the dispatching solution on the basis of network resource management and circuit closed - loop dispatching circulation

    本地網網路資源管理系統是側重於本地網網路資源的管理，同時兼顧網路質量管理。重點網路管線管理、設備管理、配置管理、拓撲管理、調度管理以及統計分析，主要設備包括pdh 、 sdh 、 dwdn 、 idlc 、 pon 、 fwa 、 adsl 、 bits等。通過主要設備的資源配備和運行狀態，該系統發現處理運行異常，從本地網全局的角度調整網路達到整體優化，保證網路的運行質量，在網路資源管理的基礎上，實現調度方案的生成，以及電路通道的閉環調度流程。
  2. Code for construction of railway optical fiber cable pdh communication project

    鐵路光纜pdh通信工程施工規范
  3. Technical condition for pdh optical line terminals used in access neteork

    接人網用pdh光端機技術條件
  4. Before the 1990s, the digital transmission equipment was based on the technical standards of plesiochronous digital hierarchy ( pdh ). in order to connect the switch to pdh transmission equipment, the switch side needs lots of terminal equipment of the primary rate, i. e., 2048 kbits ( 2m ) switching terminal circuits in compliance with itu - t standards ( e. g. s1240 s dtm trunk module and axe10 s etc module ) and ansi - standard - based 1544 kbits ones

    在90年代初期以前，數字傳輸設備是建立在pdh （ plesiochronousdigitalhierarchy ）技術標準上，為了連接交換機到pdh傳輸設備上，在交換機側需要大量的符合基群速率的終端設備，即符合itu - t標準的2048kbits （ 2m ）交換終端電路（如s1240的dtm中繼模塊， axe10的etc模塊）和符合ansi標準的1544kbits交換終端電路等。
  5. Pdh pulse code modulation

    脈碼調制
  6. Pdh plesiochronous digital hierarchy

    準同步數字體系
  7. After that, as to the transportation of ces in ip networks, two types of protocol stacks are identified, " ip over sdh / pdh " and " ip over ethernet "

    最後，針對在全ip網路中承載電路模擬業務的問題，論文分別對物理層能夠傳遞同步信息和不能傳遞同步信息兩類情況進行了討論。
  8. Some clock synchronizing resource of scc used in sdh and pdh is researched

    3 、研究了scc在pdh和sdh中使用的多種時鐘同步策略。
  9. Pdh pseudo synchronous digital hierarchy

    準同步數字序列
  10. Electric tributary pdh etp1s

    電支路插槽
  11. 39 % of total conversion efficiency at pump level of 600mw 858nm is obtained experimentaily with our single - resonant, external ring frequency - doubler pumped by tr. sapphite laser at room temperature ( about 21. 50c ). the conversion efficiency is seriously limited by what is called " blura " ( blue light induced infrared absorption ) and thermal effects. yet, up to 137 mw of cw blue light at 429nm at pump level of 565 mw has been achieved and stabilized over a hour when the cavity is locked via pound - drever - hall ( pdh ) technique

    泵浦功率為600mw時，由於兩種效應「藍光導致紅外吸收（ bliira ） 」和「熱效應（ thermaleffects ） 」的嚴重影響，室溫下（約21 . 5 ）獲得了39的倍頻轉換效率；採用邊帶鎖頻技術， 565mw的泵浦光獲得137mw的藍光輸出，在沒有外界強烈的干擾下可以鎖定1小時以上而不失鎖。
  12. Pdh microwave point - to - point communication

    B模擬微波
  13. 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。
  14. Pdh pseudo - synchronous digital hierarchy

    準同步數字系列
  15. Pdh : plesiochronous digital hierarchy

    準同步數字系列
  16. The sdh ( synchronous digital hierarchy ) is originally developed from the pdh ( plesiochronous digital hierarchy )

    它是目前光纖通信系統中應用最廣泛的數字傳輸體制。
  17. Sdh ( synchronous digital hierarchy ) has some primary advantages such as synchronous multiplexing, standard optical interface and strong network management compared with pdh ( plesiochronous digital hierarchy )

    同步數字體制（ sdh ）與傳統的偽同步數字體制（ pdh ）相比，有三大核心優勢，即同步復用、標準光介面和強大的網管能力。
  18. Initially, pdh was introduced to improve and replace the obsolete analog frequency division multiplex ( fdm ) system. however, it was soon found that pdh had shortcomings such as difficulty in management, high construction cost, limited applications and lack of connectivity standards at the optical layer. thus, in the early 1990s, synchronous digital hierarchy ( sdh ) was introduced in the transmission system

    Pdh最初引入是為了改進和替代老式的模擬頻分復用器系統，但很快被發現pdh管理困難、造價高、應用范圍窄，且缺乏在光層面上的連接標準，因此90年代初期， sdh （ synchronousdigitalhierarchy ）標準被首先引入了傳輸系統。
  19. Numeral simulations microwave transmission equipments, pdh correspondence microwave and army,

    模擬微波傳輸設備， pdh通信微波，部隊，
  20. Transportation of mpeg - 2 stream over pdh / sdh is a solution for digital video broadcasting

    利用pdh / sdh網路傳輸mpeg - 2碼流，是數字電視廣播的一種解決方案。
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