Questions:
1)What are the components of a communication channel ?
2) How does multilevel coding increase a channel's effective data transfer rate?
3)what is the function of a hub? How does it differ from a switch or router?
4)Describe the processes of encapsulation and address resolution.Why are they necessary
features of the internet?
5) Investigate the videoconferencing equipment and software offerings of a major networking or telecommunication vendor, such as Cisco Systems (www.cisco.com), Tandberg (www.tandberg.net), Radvision (www.radvision.com), or Polycom (www.polycom.com).
1. What related standards are supported in each company's product line?
2. Which vendors and products support high-definition video, and what are the related standards?
3. Describe available infrastructure products, including gatekeepers and multipoint control units (MCUs), and compare their capabilities with routers and switches in data networks.
1- For data is transmitted over twisted -pair cable , you have these characteristics:A signal's power on the channel is 75 dB, signal attenuation is 5 dB per 100 meters , and average noise power on the cable is 0.1 dB per meter. Answer the following questions:
-What's the S/N ratio at the end of a 50 - meter channel?
-What's the S/N ratio at the end of a 1 -kilometer channel?
-What's the maximum channel length if the receiving device requires at least 20 Db of S/N ratio for reliable operation?