Network Performance for Davis Networks Capstone Project

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Network Implementation for Davis Networks Inc.

In the proposal, effort is made to develop an affordable local LAN for Davis Networks Inc. The effort involves provision of wireless Internet connection to all individuals for their desktops and laptops from the current high speed connection they have at an affordable price (800 USD -- 1000 USD). Provision of the internet to the same location costs approximately 700 USD including all other expenses like doing the wiring etc. To implement the project, there are various obstacles that have to be considered like electric poles, trees and walls. The core location is the Computer Center building. It has the highest speeds of connection. From this building, there will be distribution to the surrounding buildings located between 500 and 1000 meter range. The establishment of the network needs 5 Wireless Access points (WAP) having Omni antennas (A, B, C, D, E) and two directional (X and Y) are taken. A Wireless Access Point will be installed at the computer building and it will have 2 Antennas (one Omni and another one Directional). Directional antenna (X) will be communicating with antenna (Y) which is also a directional antenna and Omni antenna (B) will be supported in between (Deep, Kush & Kumar, 2010).

Figure 1: Wireless network (ad-hoc mode)

Figure 2: Wireless network (infrastructure mode)

Communication will be made through the antennas by corresponding WAP. Line of sight existing between the antennas will be clear. In the network, all the used antennas shall communicate through other antennas and so there will be Access points at A, B, C, D and E (and working in repeater mode). As illustrated in the figure above, every access point gives the signals to the laptops and computers or other devices that can be found around. Support will be given to weak access points by a stronger one (Deep, Kush & Kumar, 2010).

As soon as the area is understood properly and the locations for the Wi-Fi identified, a survey of the market will be carried out to identify which products have the highest cost-benefit expectations and ratios. An alternative strategy can have a wired network being maintained as the pillar of the WAP. Laying down Wired networks can be expensive. To increase the bandwidths, fiber optics may be brought on board. Besides, a collection of low gain antenna WAP can be positioned to cover two to four houses that neighbor each other (Deep, Kush & Kumar, 2010).

2. Review of What Other Work

These days, several Radio Access Technologies (RATS ) are in existence including GSM/GPRS, UMTS, IEEE 802.11-based wireless LAN (e.g. WiFi) as well as IEEE 802.16-based Wireless Metropolitan Area Network (e.g. WiMAX). The coming systems of mobile communications foretell the availability of wireless communication environment that is heterogeneous and makes communication seamless. Also available will be adaptive service quality and joint service management. In a setting that has several technologies, making Radio Access Networks (RANs) that cooperate with one another can be challenging. Next Generation Mobile Networks (NGMN) gives recommendations to help in the supporting of the job of bodies concerned with standardization as well as manufacturers so as to achieve cost-effectiveness in integrated mobile communication systems in the future. There are 3 he recommendation groups. The first is functional recommendations which target the service provider's ability to give attractive and flexible services. The second relate to efficiency as far as cost is concerned. The third concerns guidance given towards the evaluation of suitability of deployment. The NGMN has expectations of the integrated network maximizing its exploitation of resources in situations where terminals are needed to give support to other RATs. A subsystem based on Session Initiation Protocol might be implemented to control access and also for network and service function (Luo & Bodanese, 2008).

Several access points and laptops with wireless capabilities can be found in homes today. It is expected that the wireless devices numbers will continue rising given the falling costs. Because only 3 non-interfering channels in 802.11 exist, performance will suffer due to the interference that will be caused by the wireless devices. Spectrum scarcity could be a big issue in the future. Solving this problem could take actively monitoring the usage of spectrum in a specific location and allocate spectrums efficiently as the wireless devices need them (Li & Liu, 2005).

Infrastructure Mode

The wireless LAN can be infrastructure mode because of the wireless access point. The mode allows wireless connection to devices in the given area covered.

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The access point has at least one antenna that allows interaction with wireless nodes. In infrastructure mode, the wireless access point ensures conversion of airwave data into wired Ethernet data, connecting wireless clients and the LAN. The network coverage can be extended by connecting several access points through a wired Ethernet backbone. A mobile device moving away from the range of an access point, it gets into the range of a different access point. Wireless clients can therefore seamlessly roam from one point to another without the connection being cut. IEEE 801.11 g/b wireless nodes are in communication with one another by way of radio frequency signals in the Industrial Scientific and Medical (ISM) band ranging from 2.4 GHz to 2.5 Ghz. The surrounding channels are apart by 5 MHz. Nonetheless, because of the effect of the spread spectrum, a node that is sending signals will make use of frequency spectrum 12.5 MHz below and above the frequency of the center channel. Interference will therefore result because of the closeness of the channels. The use of two channels which are optimally separated will improve performance a great deal as the amount of channel cross-talk will be greatly reduced. There is vulnerability and risk of theft of information as well as eaves dropping because of the wireless nature of the connection (Chapter 2 Wireless Networking Basics, 2005).

The most used WLAN protocol is 802.11b EEE standard. The protocol's operation is in the frequency range of 2.4 GHz having a 54 Mbps maximum data link and about 26 Mbps throughput rate. Depending on the technique of modulation, higher frequency means higher bandwidth, the range decreases as a result. The recently developed 802.11g protocol is a specification of the IEEE that was developed as 802.11b extension that operates in the frequency band of 2.4 Ghz, but employs better modulation so as to increase the bandwidth. The standard has a 54 Mbps data ceiling and a throughput of 22 Mbps on the higher end. So, 802.11g aims at capturing the benefits of both 802.11b and 802.11a. Radio signal propagation by the three protocols is determined by several factors and so the feature performances as outlined by the manufacturer may be misleading. The factors could include barriers like glass, metal and wood (Sohal & Dowdy, 2004).

3. Project Rationale

The wireless technology has revolutionized several cost-effective and popular wireless solutions for educational and business purposes. This paper seeks to make an affordable wireless local area network. In the case of Davis Networks Inc., it has been found out that the proposal is workable and very good given the budget as well as the time frame. Wireless technology is becoming more popular in computing and also in everyday life as it is made use of in TV remotes, unlocking or locking cars, radio, Wi-Fi and phones. Wireless adoption has enhanced the mobility of workers allowing them to travel around the world while being able to gain access to information through electronic media. The past two years has seen widespread adoption of wireless networking and mobile telephony. These devices have been further integrated to various networks like the internet. The reasons people give for not using the wired networks are delays and expenses, and hassles. Even homeowners and enterprises are foregoing installation of wired networks. Wireless networks are less expensive and have higher throughput. This has ensured the exponential growth of wireless networks in communities, homes and businesses as well as open spaces. This explains the widespread usage of wireless networks the world over and high-speed internet is no longer a luxury and is enjoyed by all travelers the world over. Two variations exist of mobile wireless networks. The first one is infrastructure networks and the other is called infrastructure less mobile network that is also referred to as ad-hoc network.

The market for wireless networking is rapidly growing as various establishments discover the advantages of using wireless networks. Wi-Fi affords users higher mobility and this is crucial in business operations in various fields like warehousing, manufacturing, transportation, airports, hotels, colleges and convention centers. Within the business, public areas, conference rooms as well as branch offices are some areas that need LANs (WLANs) (Tsi -Global, n.d).

The project has the competency to execute this big Wi-Fi rollout.

Requirements Analysis

This involves defining technical requirements as well as specifications that is the basis upon which the wireless network is designed (Tsi -- Global, n.d)......

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