A data channel on which the information transmitted can take any value between the limits defined by the channel. Voice - grade channels are analog channels.
一种数据信道，其传输的信息可取该信道规定界限内的任何值。话音信道就是模拟信道。
2
Check the dimensions of dug pipe channel, especially the grade level, inclination against design requirements, check to see whether the bedding is rammed hard enough.
检测开挖的管槽尺寸，特别是水平高程、斜度是否满足设计要求，垫层是否夯实。
3
Using professional-grade multi-channel elec volume control, high reliability;