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              深圳市金維通訊技術有限公司
              電話交換機程控電話交換機威譜電話交換機國威電話交換機...網點分布:深圳 廣州 中山 佛山 珠海 惠州

              什么叫E1(數字中繼板)



              1、一條E1是2.048M的鏈路,用PCM編碼。 
              2、一個E1的幀長為256個bit,分為32個時隙,一個時隙為8個bit。 
              3、每秒有8k個E1的幀通過接口,即8K*256=2048kbps。 
              4、每個時隙在E1幀中占8bit,8*8k=64k,即一條E1中含有32個64K。 
              E1幀結構 :E1有成幀,成復幀與不成幀三種方式,在成幀的E1中第0時隙用于傳輸幀同步數據,其余31個時隙可以用于傳輸有效數據;在成復幀的E1中,除了第0時隙外,第16時隙是用于傳輸信令的,只有第1到15,第17到第31共30個時隙可用于傳輸有效數據;而在不成幀的E1中,所有32個時隙都可用于傳輸有效數據. 
              一. E1基礎知識 
              E1信道的幀結構簡述 
              在E1信道中,8bit組成一個時隙(TS),由32個時隙組成了一個幀(F),16個 幀組成一個復幀(MF)。在一個幀中,TS0主要用于傳送幀定位信號(FAS)、 
              CRC-4(循環冗余校驗)和對端告警指示,TS16主要傳送隨路信令(CAS)、復幀定 位信號和復幀對端告警指示,TS1至TS15和TS17至TS31共30個時隙傳送話音或數據 等信息。我們稱TS1至TS15和TS17至TS31為凈荷,TS0和TS16為開銷。 如果采用帶外公共信道信令(CCS),TS16就失去了傳送信令的用途,該時隙也可用來傳送信息信號,這時幀結構的凈荷為TS1至TS31,開銷只有TS0了。由PCM編碼介紹E1:由PCM編碼中E1的時隙特征可知,E1共分32個時隙TS0-TS31。每個時隙為64K,其中TS0為被幀同步碼,Si, Sa4, Sa5, Sa6,Sa7,A比特占用, 若系統運用了CRC校驗,則Si比特位置改傳CRC校驗碼。TS16為信令時隙, 當使用到信令(共路信令或隨路信令)時,該時隙用來傳輸信令, 用戶不可
              用來傳輸數據。所以2M的PCM碼型有
              ① PCM30 : PCM30用戶可用時隙為30個, TS1-TS15, TS17-TS31。TS16傳送信令,無CRC校驗。 
              ② PCM31: PCM30用戶可用時隙為31個, TS1-TS15, TS16-TS31。TS16不傳送信令,無CRC校驗。 
              ③ PCM30C: PCM30用戶可用時隙為30個, TS1-TS15, TS17-TS31。TS16傳送信令,有CRC校驗。 
              ④ PCM31C: PCM30用戶可用時隙為31個, TS1-TS15, TS16-TS31。TS16不傳送信令,有CRC校驗。 
              CE1,就是把2M的傳輸分成了30個64K的時隙,一般寫成N*64, 
              你可以利用其中的幾個時隙,也就是只利用n個64K,必須接在ce1/pri上。 
              CE1----最多可有31個信道承載數據 timeslots 1----31 timeslots 0 傳同步 
              二. 接口 
              G.703非平衡的75 ohm,平衡的120 ohm2種接口 
              三. 使用E1有三種方法, 
              1,將整個2M用作一條鏈路,如DDN 2M; 
              2,將2M用作若干個64k及其組合,如128K,256K等,這就是CE1; 
              3,在用作語音交換機的數字中繼時,這也是E1最本來的用*,是把一條E1作為32個64K來用,但是時隙0和時隙15是用作signaling即信令的,所以一條E1可以傳30路話音。PRI就是其中的最常用的一種接入方式,標準叫PRA信令。 用2611等的廣域網接口卡,經V.35-G.703轉換器接E1線。這樣的成本應該比E1卡低的目前DDN的2M速率線路通常是經HDSL線路拉至用戶側. E1可由傳輸設備出的光纖拉至用戶側的光端機提供E1服務. 
              四. 使用注意事項 
              E1接口對接時,雙方的E1不能有信號丟失/幀失步/復幀失步/滑碼告警,但是雙方在E1接口參數上必須完全一致,因為個別特性參數的不一致,不會在指示燈或者告警臺上有任何告警,但是會造成數據通道的不通/誤碼/滑碼/失步等情況。這些特性參數主要有;阻抗/ 幀結構/CRC4校驗,阻有75ohm和120ohm兩種,幀結構有PCM31/PCM30/不成幀三種;在新橋節點機中將PCM31和PCM30分別描述為CCS和CAS,對接時要告訴網管人員選擇CCS,是否進行CRC校驗可以靈活選擇,關鍵要雙方一致,這樣采可保證物理層的正常。
              : 1. E1 與 CE1是由誰控制,電信還是互連的兩側的用戶設備?用戶側肯定要求支持他們,電信又是如何 分別實現的。首先由電信決定,電信可提供E1和CE1兩種線路,但一般用戶的E1線路都是CE1,除非你特別要只用E1,然后才由你的設備所決定,CE1可以當E1用,但E1卻不可以作CE1。 
              : 2. CE1 是32個時隙都可用是吧? CE1的0和16時隙不用,0是傳送同步號,16傳送控制命令,實際能用的只有30個時隙1-15,16-30 
              : 3. E1/CE1/PRI又是如何區分的和通常說的2M的關系。和DDN的2M又如何關聯啊? E1 和CE1 都是E1線路標準,PRI是ISDN主干線咱,30B+D,DDN的2M是透明線路你可以他上面跑任何協議。E1和CE1的區別,當然可不可分時隙了。 
              : 4. E1/CE1/PRI與信令、時隙的關系 E1,CE1,都是32時隙,30時隙,0、16分別傳送同步信號和控制信今,PRI采用30B+D ,30B傳數據,D信道傳送信令, E1都是CAS結構,叫帶內信令,PRI信令與數據分開傳送,即帶外信令。 
              : 5. CE1可否接E1。 CE1 和E1 當然可以互聯。但CE1必需當E1用,即不可分時隙使用。 
              : 6. 為實現利用CE1實現一點對多點互連,此時中心肯定是2M了,各分支速率是N*64K<2M,分支物理上怎么接呢? 電信如何控制電路的上下和分開不同地點呢? 在你設備上劃分時隙,然到在電信的節點上也劃分一樣同樣的時隙順序,電信 只需要按照你提供的時隙順序和分支地點,將每個對應的時隙用DDN線路傳到對應 分支點就行了。 
              : 7.CE1端口能否直接連接E1電纜,與對端路由器的E1端口連通 
              : .................(以下省略) 不行 
              8.Cisco 7000系列上的ME1與Cisco 2600/3600上的E1、 CE1有什么區別? 
              答 : Cisco 7000上的ME1可配置為E1、 CE1, 而Cisco 2600/3600上的E1、CE1僅支持自己的功能。 
              補充: 
              六. 配置

              光端機用*: 

              光纖---光端機--同軸線---G703轉v35轉換器--同步串口or BNC-DB15,BNC-RJ45 --



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