trunk switching 中文意思是什麼
trunk switching
解釋
長途交換-
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。 -
Toll switching trunk
長途交換干線 -
This requires new kinds of circuit - switching gateways that feature lan interfaces and telephony trunk connections to public networks and pbxs
這就要求用新型的電路交換網關，它們具有局域網介面和與公用網和用戶交換機電話中繼線連接的特點。 -
The advent of sdh technology has created conditions for the improvement of the switching network. that is why switch manufacturers developed sdh interfaces at the switch side, i. e., 155 mbits trunk modules, such as et155 etsi for ericsson s axe10, sld for alcatel s s - 1240 and stu for huawei s c & c08
Sdh技術的出現，為交換網路的改進創造了條件，因此各交換機設備供應商都在交換機一側開發了sdh介面，即155mbits中繼模塊，如愛立信公司axe10et155etsi模塊，阿爾卡特公司s - 1240的slk模塊和華為公司c & c08的stu模塊。 -
All the switches that use 155 mbits trunk ports are switching systems newly installed
採用155mbits中繼埠的交換機都是新建交換系統。 -
From these figures we can see that the use of 155 mbits trunk ports in the switches simplifies the interface between the switching and transmission networks, reduces lots of multiplex equipment of 2 mbits tributary channels in the transmission network
圖2交換機間155mbits埠互通類型二從圖中可看出，交換中繼埠採用155mbits后，交換和傳輸的介面簡單了很多。 -
It is necessary to appropriately combine and rationally plan the switching trunks in the same direction, and combine the trunk circuits in different direction into a stm - 1 port and determine the way to network the trunk circuits in the transmission network according to the trunk direction and taking into account the structure of the transmission network
此時，需要將同方向的交換中繼進行適當的組合與合理規劃，根據中繼方向，結合傳輸網路的結構，將不同方向的中繼電路組合在stm - 1埠中，並確定中繼電路在傳輸網中的組網方式。 -
In the manufacture of communication equipment, we shall further raise the proportion of homemade products in the newly added fixed switching devices ( 99 % ) ; we shall lay emphasis on the science research for development of equipment of mobile communication and optical communication equipment and try to raise the proportion of independent intellectual property rights so as to make homemade equipment take the leading position in the domestic market and let the market proportion of newly installed equipment exceed 50 % and 30 % ( for the trunk network ) respectively ; we shall basically let the low - end equipment and border equipment of the data communication network be homemade products, and quicken our steps in nationalization of the core equipment ( the backbone atm switchboard and the high - bit routing device ) on the basis of introduction, digestion and assimilation of foreign advanced technology
對于通信設備製造業，將進一步擴大新增固定交換設備國產化的比例（ 99 % ） ；將重點加強移動通信和光通信設備的科研開發力度，努力擴大自主知識產權的比例，使國產化設備在國內市場中佔主導地位，新增設備市場佔有率分別超過50 %和30 % （骨幹網）以上；基本實現數據通信網路低端設備和邊緣設備國產化，在引進、消化、吸收國外先進技術的基礎上，加快骨幹核心設備（骨幹atm交換機、高比特路由器）的國產化步伐。
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