【文章內(nèi)容簡介】 ...................................................... 25 林業(yè)數(shù)據(jù)存儲(chǔ)特點(diǎn) ................................................................................................................................. 26 整體數(shù)據(jù)量大 .................................................................................................................................. 26 數(shù)據(jù)特征不一 .................................................................................................................................. 26 中間過程數(shù)據(jù)量大 ......................................................................................................................... 26 突發(fā)事件較多，數(shù)據(jù)呈波浪狀分布 ............................................................................................ 26 數(shù)據(jù)存儲(chǔ)技術(shù)選擇 ................................................................................................................................. 27 一體化存儲(chǔ) ...................................................................................................................................... 27 磁盤存儲(chǔ)陣列 .................................................................................................................................. 27 sy 市林業(yè)局?jǐn)?shù)字林業(yè)系統(tǒng)建設(shè)總體方案 sy 在線通信信息有限公司 第 3 頁 版權(quán)所有（ sy 在線通信信息有限公司），未經(jīng)允許不得使用 網(wǎng)絡(luò)附加存儲(chǔ) .................................................................................................................................. 27 存儲(chǔ)區(qū)域網(wǎng) SAN ............................................................................................................................ 28 數(shù)據(jù)存儲(chǔ) 方案選擇 ......................................................................................................................... 29 系統(tǒng)數(shù)據(jù)流程設(shè)計(jì) ................................................................................................................................. 30 數(shù)據(jù)接口 ................................................................................................................................................. 30 用戶的數(shù)據(jù)視圖 ..................................................................................................................................... 31 4 網(wǎng)絡(luò)結(jié)構(gòu)設(shè)計(jì) .............................................................................................. 31 網(wǎng)絡(luò)設(shè)計(jì)原則 ......................................................................................................................................... 31 技術(shù)先進(jìn)性 ...................................................................................................................................... 31 保護(hù)用戶投資 .................................................................................................................................. 32 技術(shù)標(biāo)準(zhǔn)化程度 ............................................................................................................................. 32 網(wǎng)絡(luò)的可伸縮性和易管理性 ......................................................................................................... 32 良好的規(guī)劃 ...................................................................................................................................... 32 網(wǎng)絡(luò)應(yīng)用層次設(shè)計(jì) ................................................................................................................................. 32 第一層與互聯(lián)網(wǎng)連通 ..................................................................................................................... 32 第二層政府辦公專網(wǎng) ..................................................................................................................... 33 第三層內(nèi)部局域網(wǎng) ......................................................................................................................... 33 網(wǎng)絡(luò)架構(gòu)設(shè)計(jì) ......................................................................................................................................... 33 局域 網(wǎng)架構(gòu) ...................................................................................................................................... 33 網(wǎng)絡(luò)總體架構(gòu) .................................................................................................................................. 34 網(wǎng)絡(luò)平臺設(shè)計(jì) ......................................................................................................................................... 34 網(wǎng)絡(luò)平臺技術(shù)選型 ......................................................................................................................... 34 以太網(wǎng)分層結(jié)構(gòu) ............................................................................................................................. 35 通信傳輸系統(tǒng) ......................................................................................................................................... 35 撥號接入 .......................................................................................................................................... 36 ISDN 接入 ........................................................................................................................................ 37 DDN 接入 ........................................................................................................................................ 37 幀中繼接入 ...................................................................................................................................... 37 ADSL 接入 ...................................................................................................................................... 37 CableModem 接入 ........................................................................................................................... 37 無線接入 .......................................................................................................................................... 37 衛(wèi)星接入 .......................................................................................................................................... 38 以太網(wǎng)端口接入 ..........................................................................