2711-B6C10 2711-B6C10
在總線兩端連接有端結(jié)器(或終端匹配器)，主要與總線進(jìn)行阻抗匹配，限度吸收傳送端部的能量，避免信號反射回總線產(chǎn)生不必要的干擾。
總線結(jié)構(gòu)是使用同一媒體或電纜連接所有端用戶的一種方式，也就是說，連接端用戶的物理媒體由所有設(shè)備共享，各工作站地位平等，無中央結(jié)點控制，公用總線上的信息多以基帶形式串行傳遞，其傳遞方向總是從發(fā)送信息的結(jié)點開始向兩端擴(kuò)散，如同廣播電臺發(fā)射的信息一樣，因此又稱廣播式計算機(jī)網(wǎng)絡(luò)。各結(jié)點在接受信息時都進(jìn)行地址檢查，看是否與自己的工作站地址相符，相符則接收網(wǎng)上的信息。
使用這種結(jié)構(gòu)必須解決的一個問題是確保端用戶使用媒體發(fā)送數(shù)據(jù)時不能出現(xiàn)沖突。在點到點鏈路配置時，這是相當(dāng)簡單的。如果這條鏈路是半雙工操作，只需使用很簡單的機(jī)制便可保證兩個端用戶輪流工作。在一點到多點方式中，對線路的訪問依靠控制端的探詢來確定。然而，在LAN環(huán)境下，由于所有數(shù)據(jù)站都是平等的，不能采取上述機(jī)制。對此，研究了一種在總線共享型網(wǎng)絡(luò)使用的媒體訪問方法：帶有碰撞檢測的載波偵聽多路訪問，英文縮寫成CSMA/CD。
這種結(jié)構(gòu)具有費用低、數(shù)據(jù)端用戶入網(wǎng)靈活、站點或某個端用戶失效不影響其它站點或端用戶通信的優(yōu)點。缺點是一次僅能一個端用戶發(fā)送數(shù)據(jù)，其它端用戶必須等待到獲得發(fā)送權(quán)；媒體訪問獲取機(jī)制較復(fù)雜；維護(hù)難，分支結(jié)點故障查找難。盡管有上述一些缺點，但由于布線要求簡單，擴(kuò)充容易，端用戶失效、增刪不影響全網(wǎng)工作，所以是LAN技術(shù)中使用***普遍的一種。
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AUTOMATED LOGIC MX880 USPP MX880
AUTOMATED LOGIC LGC USPP LGC
AUTOMATED LOGIC G4106P USPP G4106P
AUTOMATED LOGIC 008610 NSPP 008610
AUTOMATA VME MULTI /EA D-2100-022-1 VME-GRUNDKARTE ADEPT
AUTOMATA 700603 NSPP 700603
AUTOMATA 60001200600 NSPP 60001200600
