Element management system (EMS) 網(wǎng)元管理系統(tǒng)
    Embedded control channel (ECC) 　嵌入控制通路
    End system 　末端系統(tǒng)
    Error detection code (EDC) 　差錯(cuò)檢測(cè)碼
    Errored block (EB) 　誤塊
    Errored block count (EBC) 　 誤塊計(jì)數(shù)
    Errored second (ES) 　誤碼秒，誤塊秒
    Errored second ratio (ESR) 　誤碼秒比，誤塊秒比
    Extinction ratio (EX) 　消光比