Part3 Practice on Text Task 1: Listening training Dictation of some key words Directions: You will hear some key words twice, most of which are taken from the Word Study. Then finish the Crossword Puzzle. ( See you book p. 2. Dictation of some key expressions Directions: You will hear some key expressions twice, most of which are taken from this text. Then you are asked to complete the missing words 1)most messages4)serial interface standard 2)serial transmission 5) error detecting bits 3)through eight parallel channels. 6)an agreed-upon_convention 2021/2/20 P.6
2021/2/20 P.6 Task 1: Listening training Dictation of some key words Directions: You will hear some key words twice, most of which are taken from the Word Study. Then finish the Crossword Puzzle. (See you book p. ) 2. Dictation of some key expressions Directions: You will hear some key expressions twice, most of which are taken from this text. Then you are asked to complete the missing words. @ Part3 Practice on Text 1) most ____________messages 2) serial__________________ 3) through eight_______________ 4) ________interface__________ 5) __________detecting________ 6) an ______________convention digital transmission parallel channels serial standard error bits agreed-upon
Task 2. Read. Write and Translate Read and Reply Directions: Students are required to read aloud the whole text after the teacher. Then give short answers to the following questions a) How does bit-serial transmission transfer a message? Bit-serial transmission conveys a message one bit at a time through a channel. Each bit represents a part of the message The individual bits are then reassembled at the destination to com pose the message. b)Why is the transfer rate of byte-serial transmission eight times higher than that of bit-serial transmission? Byte-serial transmission conveys eight bits at a time through eight parallel channels. Eight channels are needed; the cost thus may be as much as eight times higher to transmitthe message. c)What does a communications protocol refer to? A communications protocol is an agreed-upon convention that defines the order and meaning of bits in a serial transmission. It may also specify a procedure for exchanging messages 2021/2/20 P7
2021/2/20 P.7 Read and Reply Directions:Students are required to read aloud the whole text after the teacher. Then give short answers to the following questions: a) How does bit-serial transmission transfer a message? b) Why is the transfer rate of byte-serial transmission eight times higher than that of bit-serial transmission? Task 2: Read, Write and Translate Bit-serial transmission conveys a message one bit at a time through a channel. Each bit represents a part of the message. The individual bits are then reassembled at the destination to compose the message. Byte-serial transmission conveys eight bits at a time through eight parallel channels. Eight channels are needed; the cost thus may be as much as eight times higher to transmit the message. A communications protocol is an agreed-upon convention that defines the order and meaning of bits in a serial transmission. It may also specify a procedure for exchanging messages. c) What does a communications protocol refer to ?