A16B-1010-0150

勇?lián)?zé)任 致力于符合道德規(guī)范的、負(fù)責(zé)任的行為 西門子努力滿足一切法律和道德要求，并且，只要可能，我們還努力超 越這些要求。我們的責(zé)任是按照最高的職業(yè)和道德標(biāo)準(zhǔn)和慣例來(lái)開展業(yè) 務(wù)：公司絕不容忍任何不合規(guī)的行為。 我們?cè)凇坝聯(lián)?zé)任”方面的原則堪稱我們制定業(yè)務(wù)決策的指南針。我們 還必須鼓勵(lì)我們的商業(yè)伙伴、供應(yīng)商和其他利益相關(guān)者遵循同樣高的道 德標(biāo)準(zhǔn)。

A16B-1010-0150

聯(lián)系人：郭先生
聯(lián)系電話：18971415643《優(yōu)先》
座機(jī)：027-83238871
傳真：207-61537051
QQ：810334512《優(yōu)先》

A16B-1010-0150

以太網(wǎng)的工作原理 以太網(wǎng)采用帶沖突檢測(cè)的載波幀聽多路訪問(wèn)（CSMA/CD）機(jī)制。以太網(wǎng) 中節(jié)點(diǎn)都可以看到在網(wǎng)絡(luò)中發(fā)送的所有信息，因此，我們說(shuō)以太網(wǎng)是一 種廣播網(wǎng)絡(luò)。 以太網(wǎng)的工作過(guò)程如下： 當(dāng)以太網(wǎng)中的一臺(tái)主機(jī)要傳輸數(shù)據(jù)時(shí)，它將按如下步驟進(jìn)行： 1、監(jiān)聽信道上是否有信號(hào)在傳輸。如果有的話，表明信道處于忙狀態(tài) ，就繼續(xù)監(jiān)聽，直到信道空閑為止。 2、若沒有監(jiān)聽到任何信號(hào)，就傳輸數(shù)據(jù) 3、傳輸?shù)臅r(shí)候繼續(xù)監(jiān)聽，如發(fā)現(xiàn)沖突則執(zhí)行退避算法，隨機(jī)等待一段 時(shí)間后，重新執(zhí)行步驟1（當(dāng)沖突發(fā)生時(shí)，涉及沖突的計(jì)算機(jī)會(huì)發(fā)送會(huì) 返回到監(jiān)聽信道狀態(tài)。 注意：每臺(tái)計(jì)算機(jī)一次只允許發(fā)送一個(gè)包，一個(gè)擁塞序列，以警告所有 的節(jié)點(diǎn)）

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