trunk exchange 中文意思是什麼
trunk exchange
解釋
長途電話局。-
That is to say, a 100, 000 - line tandem exchange needs machine room space less than twice as it needs 32 2 mbits trunk shelves but only 8 155 mbits trunk shelves
也就是說， 10萬線的匯接局， 2mbits中繼機架需要32個，而155mbits中繼機架只需要8個。 -
As a result, at all these connection points, the two coaxial cables are connected to different transmission equipment, sharing the traffic load from the tandem switch to a given end exchange, with half of the respective trunk circuits put into use, ensuring network safety. for such connectivity, see figure 4
因此，在所有的同軸電纜連接處，都採用兩條同軸電纜接到不同的傳輸設備的方法，將匯接交換機到某一端局的話務量在這兩條同軸連接上進行負荷分擔，中繼電路各開一半，從而保證網路的安全性。 -
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。 -
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。 -
Thus, in case of any fault over a coaxial cable, three thirds of the trunk circuits to an end exchange can still be used so that the safety and robustness of the network can be guaranteed
這樣，一旦某一條同軸出現故障，仍能保證到某一端局的中繼還有34的電路可用，不會造成太大的影響，保證交換網路的安全性與魯棒性。
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