no7信令系统研究外文翻译(编辑修改稿)

no7信令系统研究外文翻译(编辑修改稿)内容摘要：

speed, the advantage of high channel utilization, to meet the demand of modern digital munication applications. First of all, introduced the munication work can be divided into work and work, and in the work and the munication work foundation. Run by the signaling protocol in the work can be mainly divided into: China39。 s number one signaling (signaling) with road and NO. 7 signaling signaling (road). And the munication work in our country mainly USES in the NO. 7 signalling. NO. 7 signaling is the foundation of the whole munication work, I can use such a metaphor to express NO. 7 signalling role, if the will of the entire munication work hardware to a human skeleton, then NO. 7 signalling is flowing in the blood in the body. Therefore, NO. 7 signaling is throughout the munication work, it is in order to plete the call in a munication language. NO. 7 signalling we also can say is to acplish a certain business operation interaction and some instruction or mand. NO. 7 signalling have four kinds of classification: according to the deferent direction points can be divided into to signal before and after the signal。 According to the feature points can be divided into management signaling, line signal。 According to the working area can be divided into interoffice signaling and subscriber line signal。 According to the transmission channel points can be divided into a total signaling and road signaling. 2. To introduce total signaling and road signaling: along with the road signaling refers to transmit signaling link with speech path is a link。 Signaling refers to the total road transport signaling link and the words of road on the same link. China39。 s number one signaling is signaling along with the road, and NO. 7 signaling is mon way signaling. Total signal based on its own structure and trigger out some advantages: signaling transmission speed。 Signaling large capacity。 High channel utilization。 Signaling is easy to management and maintenance。 Easy to develop some upper application based on signaling. But there are advantages as well as to the way signaling proposes some special requirements: the safety of the channel transmission is higher。 Lower bit error rate of channel transmission。 Speech path channel to add their own monitoring function, because in road signalling link is same in signaling system does not represent the speech path is interlinked. The above focuses on the NO. 7 signalling classification and their respective characteristics. basic concept of NO. 7 signalling: 1 signaling links (Link) : namely physical channel is used to transmit signal, usually a time slot for the E1 line。 2. The signaling links. (LinkSet) : a collection of attributes have the same link, also can say as a bureau to the set of all links. The same signaling links all links of concentration is where the load sharing. The direct link between the two signaling set only one。 Next we39。 ll introduce NO. 7 basic concepts of the . NO. 7 signalling work is the basis of munication work in China, it is responsible for signaling interaction to plete a business requirements of users. The NO. 7 signaling is posed of signaling point, signalling and signaling links. Here are emphatically introduce the three elements: 1) signaling point (SP) : is the signaling messages are sent or received in the signalling work entities. If the signaling messages are sent, you can call the signaling point source signaling point。 If they are receiving signaling messages, you can call the signaling point for the purpose of signaling point。 In general, each point is the signaling point for both in the signalling work and for the purpose of signaling point。 2) signalling (STP), was one of the signalling work entity, but it is neither a signal source point isn39。 t signaling point, it is will receive the message is forwarded to the other a signalling entity. 3) signaling links: the concept has been introduced in front, it is mainly responsible for the connection in the signalling work different signaling point or signalling, make its can be well versed in each other. As for the work of the connection mode and can be divided into two kinds: direct mode and direct way. Direct way namely two signaling point directly connected, without any middle transfer。 And collimating the way refers to the connection between the two signaling point is through one or more signalling transfer. Because signalling is transparent to users, as directly connected, so we call it a collimating even. Now the connection in the majority with collimation even the way in the . Introduce China39。 s NO. 7 signalling work structure, its structure is more clear, can use words to describe the entire work structure: China39。 s NO. 7 signalling work is three layer architecture, adopts double plane structure. Three layer structure are: senior signalling HSTP (distributed in all major provinces), lowlevel signalling LSTP (distribution in the prefecture level), signaling point SP (also known as end bureau, general distribution in the regional county)。 And double flat str ucture is mainly in order to improve the reliability of signalling work, we usually use A and B double flat structure, namely the HSTP usually e in pairs, and the two are linked together, so even if A HSTP fault, another can replace: NO. 7 signaling load mode, there are three, respectively is: the TDM, ATM and IP。 Their are quite different in the bearing layer, but the different is transparent to the upper user. TDM and ATM we called narrowband transmission and IP we called broadband transmission。 TDM and ATM need clocks, and IP does not need the clock。 There are two kinds of TDM speed, a 64 k (E1 line in a certain time slot), another is 2 m (using E1 line 31 slots)。 ATM at a rate of 2 m, the use of E1 line of 30 time slot (0 time slot is used for the clock, 16 slot is used to t。