designing a wireless network phần 7 ppt

... functional boundary of the warehouse naturally makes it a separate subdomain.The www.syngress.com 152_wan_ 07 6/21/01 3:25 PM Page 239 234 Chapter 7 • Designing a Wireless Industrial Network: Retail Case ... Office Office Office Break Room AP AP 152_wan_06 6/21/01 3:24 PM Page 219 Designing a Wireless Enterprise Network: Hospital Case Study • Chapter 6 225 Place the directi...

Ngày tải lên: 14/08/2014, 14:20

... the signal cannot penetrate metal. Assume you have a metal sphere. As an EM wave hits the leading edge of the sphere, it acts like an antenna, and the wave induces a voltage in the metal.This voltage ... data. An example of this is when an animal is tagged with a transmitter and the signal is collected and data is gathered over a period of time to be interpreted at a later date. Mon...

Ngày tải lên: 14/08/2014, 14:20

... mounted flat on a wall, yet still have the proper- ties and gain of a directional antenna. Figure 2. 17 shows a planar array antenna. www.syngress.com Figure 2. 17 Planar Array Antenna and Associated ... antennas. Planar Array Antennas Planar array antennas are similar in concept to Yagi antennas except all elements, both active and parasitic, lie in the same plane.This results in a...

Ngày tải lên: 14/08/2014, 14:20

... maintaining IP addresses, you can get the details necessary to obtain a range. In North America, South America, the Caribbean, and sub-Saharan Africa, the organization responsible is the Address ... of Sight RP FAU FAU Factory 152_wan_04 6/22/01 3:35 PM Page 120 94 Chapter 3 • TCP/IP and the OSI Model company.You support voice and data, which means that you might have a Frame Relay netwo...

Ngày tải lên: 14/08/2014, 14:20

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Ngày tải lên: 12/07/2014, 15:20

... technology. Around the same time that Faraday worked with electromagnetism, an American professor named Joseph Henry became the first person to transmit a practical electrical signal. As a watchmaker, he constructed batteries ... 273 Tracking the Administration Needs 274 Tracking the Athletic Needs 275 Tracking the Academic Department Needs 276 Tracking Student Union Needs 277 Trackin...

Ngày tải lên: 14/08/2014, 14:20

... can authenticate a wireless device against a list of MAC addresses.This list could reside locally on the AP, or the authentication could be checked against a database of allowed MACs located on the ... received and will transmit it again. All this takes place at the MAC layer. Noticing that an ACK has not been received, the sending unit is able to grab the radio medium before any othe...

Ngày tải lên: 14/08/2014, 14:20

... their greatest weaknesses.The same can be said when examining the attributes of a wireless network. Both mobility and ease of access are touted as some of the greatest characteristics available when ... with an issue before escalating it? ■ How will an escalation take place? ■ Which procedures will be automated? ■ What tools are available to which organization? ■ What security changes a...

Ngày tải lên: 14/08/2014, 14:20

... academic areas of the campus. At this time, only three academic areas are addressed.The planned network must be easy to adapt as these areas of study increase or change. For example, the Math and ... Athletic department may have functional groups of coaches, players, and the press.The Administrative department may designate a Financial functional group, as well as Student Records and Mana...

Ngày tải lên: 14/08/2014, 14:20

... of raw data passed through a link or network and includes both overhead signaling data as well as user data.Throughput refers to the actual amount of user data passed through the link or network. Q: ... Page 296 300 Chapter 8 • Designing a Wireless Campus Network: University Case Study A: Signal power and antenna type are the two primary factors in the range of the signal. Noise...

Ngày tải lên: 14/08/2014, 14:20