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1D54581G03

集線器的工作特點(diǎn)： 集線器多用于小規(guī)模的以太網(wǎng)，由于集線器一般使用外接電源（有源） ，對(duì)其接收的信號(hào)有放大處理。在某些場(chǎng)合，集線器也被稱為“多端口 中繼器”。 集線器同中繼器一樣都是工作在物理層的網(wǎng)絡(luò)設(shè)備。 共享式以太網(wǎng)存在的弊端：由于所有的節(jié)點(diǎn)都接在同一沖突域中，不管 一個(gè)幀從哪里來或到哪里去，所有的節(jié)點(diǎn)都能接受到這個(gè)幀。隨著節(jié)點(diǎn) 的增加，大量的沖突將導(dǎo)致網(wǎng)絡(luò)性能急劇下降。而且集線器同時(shí)只能傳 輸一個(gè)數(shù)據(jù)幀，這意味著集線器所 有端口都要共享同一帶寬。 交換式以太網(wǎng)

1D54581G03

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》

1D54581G03

簡(jiǎn)介 柔性制造技術(shù)(FMS）是對(duì)各種不同形狀加工對(duì)象實(shí)現(xiàn)程序化柔性制造加 工的各種技術(shù)的總和。柔性制造技術(shù)是技術(shù)密集型的技術(shù)群，凡是側(cè)重 于柔性，適應(yīng)于多品種、中小批量（包括單件產(chǎn)品）的加工技術(shù)都屬于 柔性制造技術(shù)。 柔性可以表述為兩個(gè)方面。第一方面是系統(tǒng)適應(yīng)外部環(huán)境變化的能力， 可用系統(tǒng)滿足新產(chǎn)品要求的程度來衡量；第二方面是系統(tǒng)適應(yīng)內(nèi)部變化 的能力，可用在有干擾（如機(jī)器出現(xiàn)故障）情況下，這時(shí)系統(tǒng)的生產(chǎn)率 與無干擾情況下的生產(chǎn)率期望值之比可以用來衡量柔性。“

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