1. to know the three basic processes of PCM: Sampling Quantizing Encoding Teaching 2. to understand that PCM is the heart of technology in communications in Objectives
1. to know the operation and advances of WDM and optical network Teaching 2. to understand the main idea and organization of the text; Objectives 3.to master some important new words, phrases and their
11, Circuit Switching and Packet Switching destination[. de ti' n e i jan]n.目的地,终点 allocate[' aelak e i t]vt.分配,分派,配给 release[ri'li:s]vt.释放,放松,发布 Jargon[吗a:gan]n.行话,土语