What is the advantage of using complex schemes such as QAM, in translating digital signals to analog signals?

Digital signals can be translated to analog signals by using relatively simple techniques such as varying the amplitude or frequency between two specified values. What is the advantage of using more complex schemes such as QAM (Quadrature Amplitude Modulation)?

Do 56.6 Kbps modems violate Shannon's Result? Explain.

During the 1940s, Claude Shannon developed Shannon's Result which concluded that phone lines can only handle up to about 35Kbps. During the 1990s it was possible to create 56.6 Kbps modems. Does this violate Shannon's Result? Explain.

Compute the minimum allowable "signal to noise ratio" to achieve the desired bit rate.

Suppose you want to achieve a bit rate of 64 Kbps using a maximum bandwidth of 10,000 Hz. What is the minimum allowable signal-to-noise ratio? Express this ratio in deciBells.

Networking: Subnetting

Hi, I need help solving this network problem: You must have at least 2500 subnets with IP address 16.0.0.0 and want to have between 50 to 60 users per network. 1. What is the class: _______________ 2. What is the default mask: ________________ 3. How many bits do you need to borrow: _________ 4. What is the subnet mask: ________________ 5. How many available subnets do you have: ________ 6. How many available hosts per subnet do you have: __________ 7. Give the network number, local broadcast and the usable IP address ranges for the 5000th, 50000th & 150000th networks.

What are Microsoft traditional name resolution approaches? What are Microsoft current name resolution approaches?

What are Microsoft traditional name resolution approaches? What are Microsoft current name resolution approaches? What are the differences between them ? Note: The old versions of Microsoft OS depends on NetBIOS name resolution, since windows 2K, Microsoft has moved towards to the standard name resolution, that is DNS. For the compatibility with the legacy applications, the NetBIOS is still in use.