四川邮电职业技术学院教案专用纸 Teaching Content Contents Time apparatuses I. Revision Teacher uses the following exercise to help the students to revise the important expressions projector, or phrases or sentences which were learnt in the study of last unit. loud speake Teacher: When I say a phrase or an expression in Chinese, you respond by giving an English equivalent your learnt in the study of Unit 2 Asynchronous Serial Data Transmission. Teacher( Chinese Students( English) 个人通信 personal communications 通信标准 communication standards 固定电话业务 fixed telephone service 网络容量 移动交换中心 mobile switching center 因际漫游 international roamin 宽带业务 broad band services 频谱分配 frequency allocation 模拟方式 analogue mode 蜂窝通信原理 cellular communication principle 基站 突发脉冲传输方式 burst transmission mode 接入方法 收费功能 切换算法 短消息服务 short message service 技术规范 technical specification II. Pre-reading Activities Ask the Ss the following two questions related to the theme of the text 1) Can you enumerate what you contacted in the study of the courses including Switching? s min Possible answers: Circuit Switching and Packet Switching 2) Can you enumerate the trait of Circuit Switching and Packet Switching? Possible answers: The circuit is set up by a special signal ing message that finds its way through the network, seizing channels in the path as it proceeds. A var iation of message switching is packet switching. Here the message is broken up into several pieces of a given maximum length, called packets. As with message switching, each packet contains a header and Page 2 of 5 Teaching Plan of English for Telecommunications Unitl I四川邮电职业技术学院教案专用纸 Page 2 of 5 Teaching Plan of English for Telecommunications Unit11 Teaching Content Contents Time Teaching Apparatuses I. Revision Teacher uses the following exercise to help the students to revise the important expressions or phrases or sentences which were learnt in the study of last unit. Teacher : When I say a phrase or an expression in Chinese, you respond by giving an English equivalent your learnt in the study of Unit 2 Asynchronous Serial Data Transmission. Teacher ( Chinese ) Students ( English) 个人通信 personal communications 通信标准 communication standards 固定电话业务 fixed telephone service 网络容量 network capacity 移动交换中心 mobile switching center 国际漫游 international roaming 宽带业务 broadband services 接口转换 interface conversion 频谱分配 frequency allocation 模拟方式 analogue mode 蜂窝通信原理 cellular communication principle 基站 base station 突发脉冲传输方式 burst transmission mode 接入方法 access method 收费功能 billing function 切换算法 handover algorithms 短消息服务 short message service 技术规范 technical specification II. Pre-reading Activities Ask the Ss the following two questions related to the theme of the text: 1) Can you enumerate what you contacted in the study of the courses including Switching? Possible answers: Circuit Switching and Packet Switching . 2) Can you enumerate the trait of Circuit Switching and Packet Switching? Possible answers: The circuit is set up by a special signaling message that finds its way through the network, seizing channels in the path as it proceeds. A variation of message switching is packet switching. Here the message is broken up into several pieces of a given maximum length, called packets. As with message switching, each packet contains a header and 3 mins 5 mins computer， projector， loud speaker blackboard