1200000112356. Communication System.pptx

Coursee 1

1. Communication System Achmad Naufal Irsyadi Dept. of Informatics Engineering, UNTAG Surabaya ©2023

2. Voice over Internet Protocol (VoIP) is a way of making phone calls using the internet. It could dramatically reduce the cost of long-distance calls. Japan has the most VoIP users but it is likely that the US and Europe will catch up fast. VoIP first digitizes your voice signal. The digital data is then reduced by audio compression using codecs (coder/decoder software and hardware). These operate in a similar way to MP3, which compresses music files. The compressed data is then broken into packets and sent across the internet. At the end, it is reconverted into audio data. Because the data rate is high, for good audio quality a broadband connection works best. Each packet of data is delivered by any route the network can find. Packets can be delayed or lost. VoIP deals with loss by dividing the data into 30-millisecond packets. If such a small packet is lost, you won’t notice. When VoIP was first introduced, the connection has to be made between PCs online at the same time. This is no longer necessary. Gateways provided by ITSPs (Internet Telephony Service Providers) make it possible to link a PC to a standard phone. For better sound quality, everyone can use a VoIP phone wherever there is a broadband connection. We can be certain that eventually all of the current circuit switched networks will be replaced with packet-switching technology. In UK, British Telecom is committed to changing its entire network. In the US, 17.5 million households will have VoIP phone services by the end of 2008. 2 The VoIP

3. 3 The VoIP Questions: Can you explain the process of the VoIP based on the picture? What type of connection does the VoIP use for communication purpose? Can you find another form of communication which resembles the picture? Could you mind telling us ‘how’ you use the media for certain communication?

4. Certainty expression is used to expressed the probability of something to happen in a certain time. The expression can happen in verb, adjective, and adverb, with vertically typology of level – from more certain to less certain. See example: The internet users will find difficult to access specific website. The internet users may find difficult to access specific website. Analysis These two sentences indicate the use of certainty expression with different level of certainty. The (a) is more certain than the (b), so that the sentence (b) is less certain – indicating that the internet users find or even do not find any difficulty. There is an uncertainty in sentence (b). 4 Certainty Expression

5. Here is the classification of certainty expression used in verb, adjective, and adverb. 5 Classification Examples: Verbs: She will buy a new hardware. She will not buy a new hardware. She could buy a new hardware. She may buy a new hardware. She might buy a new hardware. Adverbs: They are certainly the computer technicians. They are probably the computer technicians. They are possibly the computer technicians. Adjective: I have a certain task to do in the computer lab. I have a likely easy task to complete. I have unlikely easy task to complete. I am probable to be at the computer lab. It is possible for me to complete the task.

6. Please rank these predictions according to how certain the speakers are. 6 Predictions VoIP phones will revolutionize the way we communicate. VoIP phones may revolutionize the way we communicate. It’s likely VoIP phones will revolutionize the way we communicate. It’s unlikely VoIP phones will revolutionize the way we communicate. It’s probably VoIP phones will revolutionize the way we communicate. It’s possible VoIP phones will revolutionize the way we communicate. VoIP phones will certainly revolutionize the way we communicate.

7. Please make 2 sentences using certainty expression. The sentences should concern your field of study (the informatics). 2 sentences for each student. 7 Exercise! 1.

8. Thank You