8-level Vestigial Side Band (8-VSB)八级残余边带A-law-律AAL 1 circuit emulation mode AAL1电路仿真模式AC signaling交流信令ACK cycle确认周期ADSL transceiver unit (ATU) ADSL收发器单元AFE analog front end模拟前端AND逻辑和AND gate和门APD avalanche photodiode雪崩光电二极管ASCII美国国家信息交换标准代码ASCII asynchronous support package (AASP) ASCII异步支持程序包ASIC cell专用集成电路单元，专用集成电路组AT command set AT命令集ATM adaptation layer (AAL) ATM适配层ATM bearer service ATM承载电路业务 ATM cell ATM信元 ATM management objects ATM管理对象
