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1、请简买述接入网市场状,并说明对运营商的影响 测距允许消息,消息中指明ONU的上行应答的时隙:OU在指定的上行时隙中 状 p是,算是与 用测距 PLOAM信元应答:OLT计算往返时延并与理想时延比较,计算出差 的 占市 入市上 的格:市场市场竞争的实质—运营商抢占市场,入网市场上,硝值,发送一个测距时间给ONU:ONU根据测距时间调整均衡时延 烟四起,各运营商争抢用户技术
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TCPP协议和以太网协议是使用最广泛的通讯协议,而基于底层的以太网协议的实现就 由以太网控制器来负责了,目前比较常用的嵌入式以太网控制芯片有RTL8019AS、CS8900 等,我们先以RTL809AS为例子介绍以太网的控制芯片
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Unitl II. Listening Skills 1. M: Why don't we go to the concert today w: I'll go get the keys Q: What does the woman imply 2. W: I cant find my purse anywhere. The opera tickets are in it M: Have you checked in the car?
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II. Listening Skills Listening for names 1. Doris: Good morning. Can I help you? David: Yes. I need to change one of my courses Doris: I'll see what we can do. What's your name, please? David: My names David Brown Doris: Your first name again? David: David. D-A-V-L-D
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Ⅱ. Listening skills 1-12-a3-f4b5-c6-d7-h 9 III. Listening In Task 1: The Influence of Advertising Richard: Dad. I a pair of new shoes for an important basketball game. My old ones look
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Uinta I. Basic listening practice 1. Script M: Did you pick up the paper for me today? i really want to check the job vacancies W: I know, it's over there. There's not much happen though. I had a look already Maybe you should look on the Net instead
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Uinta I. Basic listening practice 1. Script M: Do you see yourself as a leader or more of a team player? W: Well, it depends on the circumstances. I usually enjoy working as part of a team and helping everyone work together. But if the leadership is weak, I'm not afraid to take over in order to achieve the goal at hand Q: What does the woman want to be?
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Ⅱ. Listening skills Identifying Numbers M: The stadium looks pretty big. How many people does it seat w: It holds around 20,000. They say more than 18,000 Tickets have been sold Q lany tickets are left 2. w: I was planning on signing up for the swimming class. Bit I heard it's full M: Really? Thats strange. There were nine swimming classes last semester, and this semester
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Uints I. Basic listening practice 1. Script W: I bought a camera from your store. Here's my receipt. I know it's just warranty period, but the camera hasn't worked properly for some time, and now it's not focusing at all. M: We're sorry you've has problem with one of our cameras. I t seems that the camera has suffered some damage, but you've been a regular customer, and wed
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Uints I. Basic listening practice 1. Script W: Why do some people stay in one job for life while others switch jobs from time to M: Some people want a fixed routine so that they dont have to adapt tot new circumstances over and over again, while others think variety is the spice of life Q: According to the dialog, why do some people stick to one job for life?
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