甚高数据速率数字用户线路
VDSL Very high data rate Digital Subscriber Line
线路潮流速率约束
available transfer c apability limitations of lines
超高速线路保护
super high-speed route protection
低速线路适配器
LLA Low speed Line Adapter
对数比率线路
log-ratio signal processor
高速线路
high-speed transmission line
高速线路适配器
HSLA High Speed Line Adapter
HLA High speed Line Adapter
高速线路转换数据
HSCSD High Speed Circuit Switch Data