140CPS11100
140CPS11100
140CPS11100
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◆ *所有備件經(jīng)過專業(yè)測試認(rèn)證。瘋狂低價(jià),趕緊來電搶購吧
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*請讓我們知道您有任何產(chǎn)品詢價(jià)的需要,我們會(huì)給您一個(gè)滿意的價(jià)格,我們等候您的詢盤(騙子勿擾)。
其實(shí)網(wǎng)卡的發(fā)展史也就是網(wǎng)絡(luò)的發(fā)展史。....
網(wǎng)卡雜談:
網(wǎng)卡的不同分類:根據(jù)工作對象的不同務(wù)器的工作特點(diǎn)而專門設(shè)計(jì)的,價(jià)格較貴,但性能很好。就兼容網(wǎng)卡而言,網(wǎng)卡一般分為普通工作站網(wǎng)卡和服務(wù)器專用網(wǎng)卡。服務(wù)器專用網(wǎng)卡是為了適應(yīng)網(wǎng)絡(luò)服種類較多,性能也有差異,可按以下的標(biāo)準(zhǔn)進(jìn)行分類:按網(wǎng)卡所支持帶寬的不同可分為10M網(wǎng)卡、100M網(wǎng)卡、10/100M自適應(yīng)網(wǎng)卡、1000M網(wǎng)卡幾種;根據(jù)網(wǎng)卡總線類型的不同,主要分為ISA網(wǎng)卡、EISA網(wǎng)卡和PCI網(wǎng)卡三大類,其中ISA網(wǎng)卡和PCI網(wǎng)卡較常使用。ISA總線網(wǎng)卡的帶寬一般為10M,PCI總線網(wǎng)卡的帶寬從10M到1000M都有。同樣是10M網(wǎng)卡,因?yàn)镮SA總線為16位,而PCI總線為32位,所以PCI網(wǎng)卡要比ISA網(wǎng)卡快。
網(wǎng)卡的接口類型:根據(jù)傳輸介質(zhì)的不同,網(wǎng)卡出現(xiàn)了AUI接口(粗纜接口)、BNC接口(細(xì)纜接口)和RJ-45接口(雙絞線接口)三種接口類型。所以在選用網(wǎng)卡時(shí),應(yīng)注意網(wǎng)卡所支持的接口類型,否則可能不適用于你的網(wǎng)絡(luò)。市面上常見的10M網(wǎng)卡主要有單口網(wǎng)卡(RJ-45接口或BNC接口)和雙口網(wǎng)卡(RJ-45和BNC兩種接口),帶有AUI粗纜接口的網(wǎng)卡較少。而100M和1000M網(wǎng)卡一般為單口卡(RJ-45接口)。除網(wǎng)卡的接口外,我們在選用網(wǎng)卡時(shí)還常常要注意網(wǎng)卡是否支持無盤啟動(dòng)。必要時(shí)還要考慮網(wǎng)卡是否支持光纖連接。
網(wǎng)卡的選購:據(jù)統(tǒng)計(jì),絕大多數(shù)的局域網(wǎng)采用以太網(wǎng)技術(shù),因而重點(diǎn)以以太網(wǎng)網(wǎng)卡為例,講一些選購網(wǎng)卡時(shí)應(yīng)注意的問題。購買時(shí)應(yīng)注意以下幾個(gè)重點(diǎn):
網(wǎng)卡的應(yīng)用領(lǐng)域:以太網(wǎng)網(wǎng)卡有10M、100M、10M/100M及千兆網(wǎng)卡。對于大數(shù)據(jù)量網(wǎng)絡(luò)來說,服務(wù)器應(yīng)該采用千兆以太網(wǎng)網(wǎng)卡,這種網(wǎng)卡多用于服務(wù)器與交換機(jī)之間的連接,以提高整體系統(tǒng)的響應(yīng)速率。而10M、100M和10M/100M網(wǎng)卡則屬人們經(jīng)常購買且常用的網(wǎng)絡(luò)設(shè)備,這三種產(chǎn)品的價(jià)格相差不大。所謂10M/100M自適應(yīng)是指網(wǎng)卡可以與遠(yuǎn)端網(wǎng)絡(luò)設(shè)備(集線器或交換機(jī))自動(dòng)協(xié)商,確定當(dāng)前的可用速率是10M還是100M。對于通常的文件共享等應(yīng)用來說,10M網(wǎng)卡就已經(jīng)足夠了,但對于將來可能的語音和視頻等應(yīng)用來說,100M網(wǎng)卡將更利于實(shí)時(shí)應(yīng)用的傳輸。鑒于10M技術(shù)已經(jīng)擁有的基礎(chǔ)(如以前的集線器和交換機(jī)等),通常的變通方法是購買10M/100M網(wǎng)卡,這樣既有利于保護(hù)已有的投資,又有利于網(wǎng)絡(luò)的進(jìn)一步擴(kuò)展。就整體價(jià)格和技術(shù)發(fā)展而言,千兆以太網(wǎng)到桌面機(jī)尚需時(shí)日,但10M的時(shí)代已經(jīng)逐漸遠(yuǎn)去。因而對中小企業(yè)來說,10M/100M網(wǎng)卡應(yīng)該是采購時(shí)的首選。
◆ *所有備件經(jīng)過專業(yè)測試認(rèn)證。
◆ 15" TFT LCD,亮度250cd/m2
◆ 最大分辨率1024×768
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◆ 支持3.5"硬盤,3.5"軟驅(qū)和光驅(qū)
◆ 標(biāo)配SHB-890工業(yè)長卡和PBP-11P4無源底板以及300W-ATX電源
◆ *請讓我們知道您有任何產(chǎn)品詢價(jià)的需要,我們會(huì)給您一個(gè)滿意的價(jià)格,我們等候您的詢盤(騙子勿擾)。
◆ *產(chǎn)品廣泛應(yīng)用領(lǐng)域如下:
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【水泥制品及生產(chǎn)制造】 【電力及水利行業(yè)】 【電力-電氣化水系統(tǒng)】
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【電站及小水電控制業(yè)】 【造紙及印刷行業(yè)】 【電力-除灰除渣系統(tǒng)】
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