2B1Q 2Binary,1Quaternary 兩個(gè)二進(jìn)位的，一個(gè)四進(jìn)位的
    AAL ATM Adaptation Layer ATM適應(yīng)層
    ADSL Asymmetric Digital Subscriber Line 非對(duì)稱數(shù)字用戶線路
    CDV Cell Delay Variation 信元延遲變更
    CLR Cell Loss Ratio 信元丟失比率
    IDLC Integrated Digital Loop Carrier 綜合數(shù)字環(huán)路載波
    AD-PCM Adaptive Differential Pulse Code Modulation 適應(yīng)微分-脈沖碼調(diào)制
    AM Amplitude Modulation 幅度調(diào)制
    AMI Alternate Mark Inversion 交替標(biāo)記倒置
    AN Access Node 訪問(wèn)節(jié)點(diǎn)
    ANSI American National Standards Institute 美國(guó)國(guó)家標(biāo)準(zhǔn)協(xié)會(huì)
    APS Automatic Protection Switching 自動(dòng)保護(hù)開(kāi)關(guān)
    ARQ Automatic Repeat reQuest 自動(dòng)重復(fù)請(qǐng)求
    AT&T American Telephone & Telegraph 美國(guó)電話/電報(bào)
    ATM Asynchronous Transfer Mode 異步傳輸模式
    ATU ADSL Termination Unit ADSL終端單元
    AWG American Wire Gauge 美國(guó)線規(guī)