ddn 中文意思是什麼

For a long time, incumbent carriers tended to regard spc exchange, ddn, fr, atm and ip equipment as leading network elements. most often than not, the transmission equipment is only seen as supportive parts for those leading elements

長期以來，主體電信經營商都認為程式控制電話交換機、 ddn 、 fr 、 atm 、 ip等設備是作為網路的主體，而傳送設備僅認為是這些設備的配套。

Adopt ddn data cables organize wide area network, safe and reliable

採用ddn數據專線組建廣域網路，安全可靠。

For the time being, the standard 155mbits interface is widely deployed in equipment like fr, ddn, router and atm. with stm - 1 being adopted for accessing vip customers, private networks have also become a key access means

目前fr 、 ddn 、路由器、 atm等設備都有155mbits的標準介面，由stm - 1接入大型客戶，組成客戶的專網也成為主要的接入手段。

It is really the best choice for your business conference. travel etc. 5 minutes from jiuzhou port, 15 minutes. from zhuhai gongbei customs and 45 minutes from zhuhai airprt 534 guest room and suites offers view of mounta - in sea, satellite tv and closed - circuit tv, idd, ddn mini - bar, electronic burglary - resisting system, laundry service, 24 hours room service, safe, refrigerator, electric heat kettle, weight balance etc, some rooms equipped with far infrared ray light wave bathroom.

酒店共有534間標準豪華客房共有各種規格會議室28間，其中金色年華多功能大廳，面積3000平方米，能容納2500人同時舉行宴會或者會議，是高層次大型會議舉辦場地的首選。酒店藉著東方傳統的款客禮儀，恭迎五湖四海的嘉賓，細微周到的服務功能備的設施，讓您盡情舒展商旅奇跡。

Digita1 data network ( ddn ) is a digita1 transmitting network that transmi ts data by digital channe1s

數字數據網ddn （ digitaldatanetwork ）是利用數字通道傳輸數據信號的數據傳輸網路。

Gaoyou telecommunication network has built five communication platforms such as ddn, exchange in groups, internet

高郵網路應用層建成了ddn分組交換internet等五個通信平臺。

The research and developing of gps / gsm vehicles watch and control system based on analyzing gps positioning technology is discussed in this article. this system is a public security prevention and far distance watching control telecommunication management which has adopt the advanced system in the world including gps / gsm, gis and internet. through this system, all the movable objectives covered by gsm net can be kept being watched and controlled from far distance. the gps data of the movable objectives and different kinds of alarm data will be sent back to the service center through gsm or cable. then the center may send the information of movable objectives " gps data and help alarms that have been already classified and identified to the different departments to deal with linking the consumers through ddn, isdn, pstnand adsl. the advantages of this system is that it adopts mature gps technology and combines the movable telecommunication net - gsm provided by china telecommunicate trades throughout the nation and it can get voice information everywhere. by utilizing internet, vbandsql server computer technology, watch and control center and far distance terminals can aim at how to increase vehicles operating efficiency, decrease wear, promote service quality and build a concentrated system of watch and control, deploy and cammand, scientific management, coordinate and process, and safety in the professions relevant with transfortation of the city

移動目標的gps數據及各類報警數據通過gsm網路及電信有線網路傳回監控服務中心。該中心可通過ddn 、 isdn 、 pstn或adsl等方式與用戶相聯，將移動目標的gps定位信息，求救信息，報警等信息進行分類確認后，實時傳送到相應的職能部門進行處理。本系統的優點在於利用了成熟的gps全球衛星定位技術，並結合了我國電信行業在全國所開通的gsm移動通訊網路，在話音上實現了全國漫遊等特點，在監控中心和遠程用戶終端利用網際網路技術、 vb數據庫管理系統、 sqlserver分散式數據庫管理系統等計算機技術，可針對城市中與交通有關的各行各業如何提高車輛使用效率，降低損耗，提高服務質量，建立集監控、調度指揮、科學管理、協調運營、安全防範為一體的指揮控制體系，發揮其不可替代的作用。

Media gatewaytdmatm integrated access equipment is the main way of narrow band and data private line access. users may access fixed telephone network and dial - up access braodband man through twisted cable ; users may access broadband data network through adsl or ddn, or fr, etc ; mobile comminication users may access 2g or 3g mobile communication network through base station equipment and wireless gateway

媒體網關tdmatm綜合接入設備主要是窄帶和數據專線接入方式，用戶通過雙絞線可以接入固定電話網以及撥號接入寬帶ip城域網；用戶通過adsl或ddn 、 fr等可接入寬帶基礎數據網；移動通信用戶通過基站設備和無線網關可接入第二代或第三代移動通信網。

Typical applications but not limited to, are professional quality video communications ( ip - video ), remote digital surveillance, video conferencing, corporate access for banks, military, villas, mines, border surveillance, traffic control, switching cabinets, warehouses, equipments, remote education medical, high - speed internet service to commercial customers, ddn extension, internet cafes, and real time remote data backup

促使許多企業用戶放棄adsl ， t1e1和幀中繼線路，轉而使用sdsl ，一些t1e1或幀中繼業務提供者已經開始將發展重點放在sdsl上。因為sdsl的穩定性、可靠性、安全性均遠高於adsl 。造價又遠低於t1e1和幀中繼線路，越來越多的企業用戶開始使用sdsl服務。

Application of vhdl in voice system of ddn

網語音系統中的應用

It is also a good place to rest and chat with friends and colleagues. all rooms are installed with internet ddn access and a video - on - demand system

為關注環保公益事業，特設三層不吸煙樓層，分別在9層20層和24層以及一間能夠滿足殘疾人士需求的殘疾人房間。

Wuxi boasts a first - grade water port at jiangyin harbour, a secong - grade water port at xiadianqiao bridge and a second - grade land port, where the establishment of china customs wuxi superintendent section has made fast and easy customs clearance possible. wuxi superintendent section is equipped with an advanced network system linked with nanjing customs and wuxi customs through ddn line. the complete electronic declaration and control system make direct import and export declaration possible at wuxi superintendent section. this function brings about a one - stop service for declaration, inspection and dispatch, and offers flexibility in the arrival, declaration, inspection and clearace of goods

無錫擁有江陰港水路一類口岸、下甸橋水路二類口岸和無錫陸路二類口岸，並開通了海關直通點的海關電腦網路系統，通過ddn專線連接無錫海關和南京海關，完善的電子報關及監管系統使貨物出口封關與進口檢驗啟關可全部在無錫直通點完成，做到貨物隨到、隨報、隨驗、隨清。

Network education teaching on internet divides into synchronous and asynchronous teaching two classes. the synchronous teaching transfers the multimedia classroom ’ s scene and teacher ’ s media in teaching with ddn / adsl / atm and sky satellite to distance classroom at real - time by internet audio and video technology so that the teacher questions their students and their students ask the question as well or the students consult their teacher, which realizes the similar teaching at a classroom. the courseware on demand ( cod ) is a important study method in asynchronous teaching, that the courseware was stored in the computer server, the student demand the courseware according to their plan to self - study, accompanying that the teachers answer the students ’ question on internet, bbs at the same time, which complete the asynchronous teaching

利用internet實現網路教學可以分為同步式和異步式兩種:同步式教學主要應用internet的網路音視頻技術，通過地網（ ddn / adsl / atm ）或天網（衛星）將多媒體教室中教師授課內容和授課情景實時轉播到遠端多媒體聽課教室，學生可在遠端即時回答老師的提問或向老師提問，實現了與真實課堂類似的實時互動式教學;異步教學的重要學習方式是課件點播（ coursewareondemand ） ，即將多媒體課件放在服務器上，學生依據個人學習進度通過網路點播所需課件進行自主學習，同時與教師在網上輔導答疑、網上討論等環節相結合，完成網路教學的異步教學過程。

One reason for this increase is that the traffic on the 155 mbits dedicated lines increased ; the other reason is the use of 155 mbits trunk ports in the data networks ( ddn, fr, etc. ) and switches

其中一個原因是155mbits專線業務有所增加，另一個原因就是數據網（ ddn 、 fr等）和交換機採用了155mbits中繼埠。

Through the special - line connection of ddn with the various major banks, the system can send the data, which taxpayers may need to visit in a real - time way, from the tax - bank interface program to the corresponding bank in the user information. the bank terminal will deduct the fund from the account of the user. afterwards, the results will be returned to the declaration database

通過與各大銀行的ddn專線聯接，可以將各納稅人需實時訪問銀行的數據由系統提供的稅銀介面程序發送至各納稅用戶信息中對應的銀行，由銀行端對用戶進行扣款處理，處理完成後一併將結果返回至申報數據庫中。

Bes ides these, it has a1 so successfu1ly connected with the equipments of ddn produced by new bridge corp

產品通過二次定型，並成功地進行了與gdc公司和新橋公司節點機的對通測試。

While enterprises will find it much easier to build up intranet by using leased line or ip vpn services offered by telecom companies, users, with access points at their doorstep, will be able to plug - and - play the leased line services without caring about which technology is being used, be it ddn, fr or atm, thanks to the development of telecom technologies and consolidated telecom networks

企業將能夠更加方便地採用電信公司提供的專線或ipvpn來組成企業內部網。隨著電信技術的發展和電信網路的整合，用戶將不再需要關心採用的網路技術是ddn 、 fr還是atm ，網路的接入點就在自己的家門口，實現專線業務的即插即用將不是一個夢想。

Since the existing networks are classified according to technologies used, the pstn, ddn network, fratm network and ip network are independent of each other, which has resulted in many problems such as waste of investment, complicated maintenance and inconvenient business deployment. on the contrary, future networks will be moving towards convergence with uniform network core and access layer while paying less attention to technical differences

現有的網路常常是按技術特徵區分的，形成相互獨立的電話網、 ddn 、 fratm網、 ip網，造成投資浪費並且維護復雜、業務部署困難，未來的網路將越來越淡化技術細節上的差異，謀求網路融合，形成統一的網路核心和統一的網路接入層。

The design of hotel of wine, fitting up the novel and luxurious guest room all original and different, the room is spacious and bright, ddn special line broadband network insert, individualized article disposition, will let you experience favourite show loving care for in most slight place, have a taste of the true feelings carefully, the independent desk disposed in commercial separate room and suite is designed for one degree of bodies of modern travelling businessman especially, try the piss of the travelling businessman in beilun of your excellency best very much

酒店設計裝修新穎豪華的客房皆獨具匠心，房間寬敞明亮， ddn專線寬帶網接入，個性化的物品配置，在最細微處都會讓您感受到至愛關懷，領略細意真情，商務單間及套房所配置的獨立寫字臺更是為現代商旅度身而設，極盡閣下北侖商旅之便。

Adopting advanced sdh light cable transmission facilities, the group exchange net, ddn data telecommunications net, isdn wide band net and xinji information net. xinji has advanced financial system

採用sdh先進的光纜傳輸設備，建成了分組交換網ddn數字數據通信網， isdn寬帶和高水平辛集信息港，形成了高速大容量互動式的現代信息網路。