【正文】 信令傳輸速度快；信令容量大；信道利用率高；信令易于管理和維護；易于開發(fā)一些基于信令的上層應用。同一個信令鏈路集中的所有鏈路是負荷分擔的。下面就著重介紹一下這三要素： 1） .信令點（ SP）：即為信令網(wǎng)中發(fā)送或接收信令 消息的實體。直連方式即指兩個信令點直接相 連，中間不經(jīng)過任何轉(zhuǎn)接；而準直連方式是指兩個信令點間的連接是經(jīng)過一個或多個信令轉(zhuǎn)接點轉(zhuǎn)接的。其三層結(jié)構(gòu)分別為：高級信令轉(zhuǎn)接點 HSTP（分布在各主要省分）、低級信令轉(zhuǎn)接點 LSTP（分布在地級市 ）、信令點 SP（又稱為端局，一般分布在地級縣）；而雙平面結(jié)構(gòu)主要是為了提 高信令網(wǎng)的可靠性，我們一般采用 A、 B 雙平面結(jié)構(gòu)，即 HSTP一般都成對出現(xiàn)，并兩兩相連，這樣即使一個 HSTP 故障了，另外一個還可以接替： 信令的承載方式有三種，分別為： TDM、 ATM 和 IP；其各自在承載層上有很大的不同，但這些不同對上層用戶來說是透明的。下面將詳細介紹這四層的作用以及在 CPCI 平臺的哪個模塊處理： 1） . MTP1 信令數(shù)據(jù)鏈路層：對應于 OSI 模型中的物理層。在我們移動通信網(wǎng)絡中，都采用數(shù)字信令數(shù)據(jù)鏈路。 2） . MTP2 信令鏈路層：對應于 OSI 模型中的數(shù)據(jù)鏈路層。而信令鏈路狀態(tài)監(jiān)視主要包括：信令單元差錯率的監(jiān)視、處理機故障處理及信令鏈路故障處理和擁塞時的流量控制。 MTP2 層就好像一條安裝了交通指示燈的公路，該公路上的車流有斷連和暢通的狀態(tài)。 MTP2 層保證了兩個直接連接的信令點之間傳送信令消息的可靠性，但它對信令消息不作任何處理（從用戶層面上看，其實 MTP2 層會向消息碼流中插入定位定界符和差錯校驗位）， MTP3 則是處理信令消息的最低一層。信令消息 處理內(nèi)部又可以分為三大塊：消息識別、消息分配和消息編路。該公路上的車流不但有斷連和暢通的狀態(tài)，而且還有路由尋址的功能。 結(jié)論：七號信令應用非常廣泛，就是因為它的傳輸快，容量大，還有支持 業(yè)務的擴展，這些特點一方面滿足當前的社會需求，同時，未來通信技術(shù)的發(fā)展也是以業(yè)務的擴大來進行的，這些需求 信令基本都能滿足，因此得到廣泛應 用。在 信令系統(tǒng)中，信號信息可以是與一群電路有關(guān)的信號信息或是用于網(wǎng)絡管理的其他信息 ，因此， 信令系統(tǒng)實質(zhì)上是電信網(wǎng)中各個處理機之間用作傳遞信息的專用數(shù)據(jù)通信系統(tǒng)，而 信令網(wǎng)作為通信網(wǎng)的支撐網(wǎng)也可視為一個相對獨立的數(shù)據(jù)通信網(wǎng)。 信令系統(tǒng)的優(yōu)點 信令系統(tǒng)最適合由數(shù)字程控交換機和數(shù)字傳輸設備所組成的綜合數(shù)字網(wǎng)，能滿足現(xiàn)在及將來傳送呼叫控制、遙控、維護管理信令及處理機之間事務處理信息的要求，提供了可靠的方法，使信令按正確的順序傳送又不至丟失或重復。 信令系統(tǒng)還能在通信網(wǎng)中傳送呼叫控制、統(tǒng)計、計費及其他維護管理信息 ,適合綜合業(yè)務數(shù)字網(wǎng) (ISDN)和智能網(wǎng)等新業(yè)務的使用。M)，它與 HSTP 之間分別采用 鏈路和 鏈路連接， 鏈路用來傳遞 SP 點的管理消息。 信令網(wǎng)集中檢測系統(tǒng) 集中監(jiān)測系統(tǒng)采用分層的體系機構(gòu)，主要分為三層：數(shù)據(jù)采集和本地數(shù)據(jù)預處理層；數(shù)據(jù)處理和存儲層，包括遠端站、服務器中心站服務器和數(shù)據(jù)庫服務器；數(shù)據(jù)應用層。遠端站和中心站要使用廣域網(wǎng)絡系統(tǒng)來連接，廣域網(wǎng)可采用。 利用 信令監(jiān)測系統(tǒng)，我們能夠完成對 信令網(wǎng)的測試與維護、接通率和呼損統(tǒng)計分析、故障、告警和性能管理，實現(xiàn)對電話用戶的管理。但目前兩個系統(tǒng)都不能完善地擔負起對 信令網(wǎng)的維護與管理，其中后者是對前者的必要補充是對目前電話網(wǎng)網(wǎng)管的必要支持。另一輔助控制模塊 SACEN7 完成Level3 (第三級 )的鏈路路由轉(zhuǎn)換功能。 S1240和 EWSD交換機中與 20多條，可用來顯示、創(chuàng)建、修改和刪除某一 (如 EXCHTYPE、 L KTYPE)及 信令鏈路參數(shù) (如 OPC、 DPC)還有鏈路狀況等。 結(jié)論 七號信令有著廣闊的應用前景。 目前 信令系統(tǒng)主要用于電話網(wǎng)、電話交換的數(shù)據(jù)網(wǎng)、交換局與網(wǎng)絡數(shù)據(jù)智能網(wǎng)、網(wǎng)絡的操作管理和維護。 NO. 7 signalling system research In this paper The No. 7 signalling work is an important part of modern munication work, it supports the entire munication work business at present. Our country adopts No. 7 signalling work is business supporting work has a variety of functions, and has built a set of relatively perfect work system. Papers from No. 7 signalling work structure was introduced in detail our country currently in No. 7 signalling work maintenance and management work, is the No. 7 signalling work pipe system and the difference between the No. 7 signalling monitoring system, this paper introduces the SPC exchange in the No. 7 signalling system hardware and software configuration and maintenance, and the deficiency existing in the current work and the problems faced by the brief explanation. At the same time also sums up the NO. 7 signalling system in the future development direction. The introduction Strong monality of No. 7 signalling System (Signaling System No. 7) is the international telegraph and telephone consultative mittee (CCITT) in 1980, now No. 7 signalling through extended modified many times, has formed a plete System of Signaling. In the heart of the modern munication work users voice, data and control data transfer of control data (signaling) sent separately special transmitting signaling work is called the signalling work, No. 7 signaling work system is the signalling work system. No. 7 signaling work system is the core of the modern munication work, it supports the current all the business of the whole munication work, the telemunication work data work to the cellular telephone work the whole munication industry are dependent on the No. 7 signaling work system. No. 7 signaling work system itself is a data work, and provides a set of protocols and message types of standard, so all signaling and control information can be in the form of data message transmission and can support the infinite variety of data. No. 7 signalling work is one of the three supporting work of telemunication work, is an important part of telemunication work, its application is very extensive. So far our country has been established by senior signalling (HSTP), lowlevel signalling (LSTP) and a large number of signaling point (SP), consisting of tertiary really makes as neural work and supporting work of telemunication work. Therefore no. 7 signalling work operation quality directly affects the telemunication work and its various work operation stability and actual benefits. With the increasingly development of munication work, the transmission quality enhances unceasingly, digital munication has been widely used. Due to No. 7 signalling system has many wellknown advantages, No. 7 signalling gradually replaced with road signaling applications in the field of all kinds of munication, in our country has initially formed the independent No. 7 signalling work. Key words: signaling channel mobile munications work base station 1: the signal is divided into with road and road signaling two, ss7 is mon way signaling, said speech signal from a signaling message transmission, is at present our country mainly adopts technology. It has a large capacity of transmission, faster 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。 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。 High channel utilization。 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 an