Compute checksums of a given bit pattern, using "single parity bit" and "two-dimensional parity" schemes.

Suppose that the information content of a packet is the bit pattern 1111000010100101 and an even parity is being used [a] What would be the checksum field in a single parity bit scheme? [b] What would be the value of the checksum field for the case of a two-dimensional parity scheme? Your answer should be such that a minimum-length checksum is used.

WLAN over wired

Discuss reasons that might make it favorable or unfavorable to install a Wireless LAN network in an organization over a traditional wired network. Search the Internet to find one example such as a university or museum or any other organization and their rationale behind such a decision.

Network

1. Discuss the advantages and disadvantages of using radio frequency (RF) communications vs. infra red (IR) communications. Comparisons may include bandwidth, FCC regulation, interference, and eavesdropping. 2. Discuss the client-side software that can be used by your local hospital doctors to access patients' information using their cellular phones or PDAs while they are not in the hospital.

Voice over IP (VoIP)

An interesting emerging market is using Internet phone and a company's high speed LAN to replace the same company's PBX. Write a one page report on this issue. Cover the following questions in your report: a. What is a PBX? b. Consider a call between a user in the company and another user out of the company who is connected to a traditional telephone network. What sort of technology is needed at the interface between the LAN and the traditional telephone network? c. In addition to Internet phone software and the interface in Part b (above) what else is needed to replace the PBX?

RF technology

Search the Internet to find examples of devices that use radio frequency technology and those that use infrared (IR which includes the IrDA specifications IrPHY, IrLAP, IrLMP, IrCOMM, Tiny TP, IrOBEX, IrLAN and IrFM "Point & Pay"). Recommend at least two IR devices and two 802.11 devices to be used in the design of the WLAN of your local hospital. Compare costs and capabilities.