HO Higher Order 　 高階
    HOA Higher Order Assembler 高階組裝器
    HOI Higher Order Interface 高階接口
    HOVC Higher Order Virtual Container 高階虛容器
    HP Higher order Path 高階通道
    HPA Higher order Path Adaptation 　高階通道適配
    HPC Higher order Path Connection 　高階通道連接
    HPOM 　Higher order Path Overhead Monitor　 高階通道開(kāi)銷監(jiān)視
    HPP Higher order Path Protection 高階通道保護(hù)
    HPT Higher order Path Termination 高階通道終接
    HSUT 　 Higher order path Supervisory 　高階通道監(jiān)視未裝載終接
     　 Unequipped 　Termination
    HTCA 　Higher order path Tandem 高階通道串聯(lián)連接適配
     Connection Adaptation
    HTCT 　 Higher order path Tandem 　高階通道串聯(lián)連接終接
     　 Connection Termination
    HTCM 　 Higher order path Tandem 高階通道串聯(lián)連接監(jiān)視