150-F201NBR
交換機處理幀有不同的操作模式： 存儲轉發(fā)：交換機在轉發(fā)之前必須接收整個幀，并進行檢錯，如無錯誤 再將這一幀發(fā)向目的地址。幀通過交換機的轉發(fā)時延隨幀長度的不同而 變化。 直通式：交換機只要檢查到幀頭中所包含的目的地址就立即轉發(fā)該幀， 而無需等待幀全部的被接收，也不進行錯誤校驗。由于以太網幀頭的長 度總是固定的，因此幀通過交換機的轉發(fā)時延也保持不變。
150-F201NBR
聯系人：郭先生
聯系電話：18971415643《優(yōu)先》
座機：027-83238871
傳真：207-61537051
QQ：810334512《優(yōu)先》
150-F201NBR
1985年是西門子與中國開展合作的里程碑。1985年10月29日，雙方在北 京簽署《西門子公司與中華人民共和國在機械工業(yè)、電氣工程和電子工 業(yè)等領域開展合作的備忘錄》。西門子是第一家應邀與中國進行如此深 入合作的外國企業(yè)。 1987年，西門子公司開始了與中國建立合資廠的探索。1988年10月31日 ，西門子達成在中國建立第一家生產型企業(yè)的協議，生產數字公共電話 交換系統(EWSD)。隨后，北京國際交換系統有限公司(BISC)于1990年11 月宣告成立，以滿足中國不斷增長的公共電話系統的需求。
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