1794-TB2 AB
◆ 聯(lián)系人： 雷琳
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誠信經(jīng)營，質(zhì)量為首，服務至上，莫格電氣 小雷 竭誠為您服務?。?！————————————————————————————
wdm設備則首次拓展了光領域，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90年代中期商用以來，wdm系統(tǒng)發(fā)展極為迅速，已成為實現(xiàn)大容量長途傳輸?shù)闹髁魇侄?。不過，現(xiàn)階段大多數(shù)wdm系統(tǒng)主要用在點對點的長途傳輸上，聯(lián)網(wǎng)依然在sdh電層上完成。
基于sdh的mstp對傳統(tǒng)的sdh進行了改進。除了有標準sdh傳送節(jié)點所具有的功能外，還應具有具有tdm業(yè)務、atm業(yè)務或以太網(wǎng)業(yè)務的接入功能；具有tdm業(yè)務、atm業(yè)務或以太網(wǎng)業(yè)務的傳送功能，包括點到點的透明傳送功能；具有atm業(yè)務或以太網(wǎng)業(yè)務的帶寬統(tǒng)計復用功能；具有atm業(yè)務或以太網(wǎng)業(yè)務映射到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，面對電信業(yè)務all ip化，雖然還有很長的生存空間但最終會被ptn逐漸取代。
ptn可看作是mstp的更進一步的演進，其主要面對的是分組業(yè)務的傳送（ip等），但不同于由路由器或交換機組建的數(shù)據(jù)網(wǎng)絡，ptn主要還是定位于管道傳送，其在qos，時延等方面，雖不及tdm傳送網(wǎng)絡的嚴格保證，但比路由器或交換機的網(wǎng)絡強許多，同時在網(wǎng)絡的管理維護等方面，延續(xù)以往sdh/mstp網(wǎng)絡的管理維護理念，因此包括業(yè)務的發(fā)放，監(jiān)控與管理方面，都不同于以往的數(shù)據(jù)網(wǎng)絡。
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)計復用等數(shù)據(jù)網(wǎng)絡特性，相當于在tdm傳送與ip傳送間取了一個平衡，來滿足業(yè)務發(fā)展的需求。 ptn當前，主要用于傳送高質(zhì)量的精品業(yè)務，如企業(yè)數(shù)據(jù)專線，移動網(wǎng)絡回程等，接入的業(yè)務豐富，可以是e1/imae1/ip over e1等， 也可以使fe/ge等數(shù)據(jù)業(yè)務。
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