A06B-6087-H115發那科購買

A06B-6087-H115

1988年，西門子決定建立一家生產計算機斷層掃描系統(CT)的合資廠。 這份協議最終促成了西門子醫療器械有限公司于1992年成立，這是西門 子在德國以外成立的第一家CT生產基地。 1995年，西門子（中國）有限公司在武漢、福州和廣州建立了西門子在 中國最早的3個地區辦事處。西門子同年在中國建立了13個運營公司。 同年7月，時任中國國家主席江澤民在訪德期間參觀了西門子在慕尼黑 的總部。

A06B-6087-H115

聯系人：郭先生
聯系電話：18971415643《優先》
座機：027-83238871
傳真：207-61537051
QQ：810334512《優先》

A06B-6087-H115

沖突（Collision）：在以太網中，當兩個數據幀同時被發到物理傳輸介 質上，并完全或部分重疊時，就發生了數據沖突。當沖突發生時，物理 網段上的數據都不再有效。 沖突域：在同一個沖突域中的每一個節點都能收到所有被發送的幀。 影響沖突產生的因素：沖突是影響以太網性能的重要因素，由于沖突的 存在使得傳統的以太網在負載超過40%時，效率將明顯下降。產生沖突 的原因有很多，如同一沖突域中節點的數量越多，產生沖突的可能性就 越大。此外，諸如數據分組的長度（以太網的最大幀長度為1518字節） 、網絡的直徑等因素也會影響沖突的產生。因此，當以太網的規模增大 時，就必須采取措施來控制沖突的擴散。通常的辦法是使用網橋和交換 機將網絡分段，將一個大的沖突域劃分為若干小沖突域。

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