1794-TB2 AB
◆ 企業(yè)名稱：廈門莫格電氣自動(dòng)化有限公司
◆ 聯(lián)系人： 雷琳
◆ 手機(jī)：18050035902
◆ Q Q ：1982497648
◆ 電話：0592-6808394
◆ 傳真：0592-6514751
誠(chéng)信經(jīng)營(yíng)，質(zhì)量為首，服務(wù)至上，莫格電氣 小雷 竭誠(chéng)為您服務(wù)！！！————————————————————————————
wdm設(shè)備則首次拓展了光領(lǐng)域，充分利用光纖通信的波分特性，大大提高了傳送網(wǎng)的容量。自20世紀(jì)90年代中期商用以來(lái)，wdm系統(tǒng)發(fā)展極為迅速，已成為實(shí)現(xiàn)大容量長(zhǎng)途傳輸?shù)闹髁魇侄巍２贿^(guò)，現(xiàn)階段大多數(shù)wdm系統(tǒng)主要用在點(diǎn)對(duì)點(diǎn)的長(zhǎng)途傳輸上，聯(lián)網(wǎng)依然在sdh電層上完成。
基于sdh的mstp對(duì)傳統(tǒng)的sdh進(jìn)行了改進(jìn)。除了有標(biāo)準(zhǔn)sdh傳送節(jié)點(diǎn)所具有的功能外，還應(yīng)具有具有tdm業(yè)務(wù)、atm業(yè)務(wù)或以太網(wǎng)業(yè)務(wù)的接入功能；具有tdm業(yè)務(wù)、atm業(yè)務(wù)或以太網(wǎng)業(yè)務(wù)的傳送功能，包括點(diǎn)到點(diǎn)的透明傳送功能；具有atm業(yè)務(wù)或以太網(wǎng)業(yè)務(wù)的帶寬統(tǒng)計(jì)復(fù)用功能；具有atm業(yè)務(wù)或以太網(wǎng)業(yè)務(wù)映射到sdh虛容器的指配功能，具有以太網(wǎng)二層交換、以及中間的智能適配層。mstp的出現(xiàn)解決傳統(tǒng)sdh技術(shù)難以有效處理數(shù)據(jù)傳送要求，但是mstp的內(nèi)核仍然是電路交換，面對(duì)電信業(yè)務(wù)all ip化，雖然還有很長(zhǎng)的生存空間但最終會(huì)被ptn逐漸取代。
ptn可看作是mstp的更進(jìn)一步的演進(jìn)，其主要面對(duì)的是分組業(yè)務(wù)的傳送（ip等），但不同于由路由器或交換機(jī)組建的數(shù)據(jù)網(wǎng)絡(luò)，ptn主要還是定位于管道傳送，其在qos，時(shí)延等方面，雖不及tdm傳送網(wǎng)絡(luò)的嚴(yán)格保證，但比路由器或交換機(jī)的網(wǎng)絡(luò)強(qiáng)許多，同時(shí)在網(wǎng)絡(luò)的管理維護(hù)等方面，延續(xù)以往sdh/mstp網(wǎng)絡(luò)的管理維護(hù)理念，因此包括業(yè)務(wù)的發(fā)放，監(jiān)控與管理方面，都不同于以往的數(shù)據(jù)網(wǎng)絡(luò)。
sdh/mstp如果看作剛性的管道傳送， 則ptn可看作彈性的管道傳送， 其具有類似sdh/mstp的傳送能力與質(zhì)量，又具有收斂，統(tǒng)計(jì)復(fù)用等數(shù)據(jù)網(wǎng)絡(luò)特性，相當(dāng)于在tdm傳送與ip傳送間取了一個(gè)平衡，來(lái)滿足業(yè)務(wù)發(fā)展的需求。 ptn當(dāng)前，主要用于傳送高質(zhì)量的精品業(yè)務(wù)，如企業(yè)數(shù)據(jù)專線，移動(dòng)網(wǎng)絡(luò)回程等，接入的業(yè)務(wù)豐富，可以是e1/imae1/ip over e1等， 也可以使fe/ge等數(shù)據(jù)業(yè)務(wù)。
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