Now shielded can be used for some types of equipment

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Now shielded can be used for some types of equipment to absorb their EMI emissions. However, the EMI in some environments is strong enough, that really the only solution is to implement a wired network instead of a wireless network. Summary 9:09-9:25 That's it for this lesson. In this lesson, we talked about many issues you may have to troubleshootwhen managing wireless network clients. We talked about checking basic misconfiguration issues first. We talked about security configuration issues. We talked about connecting to hidden wireless networks. And then we discussed the issues that may degrade the radio signal used by wireless networks. Regardless of the type of wireless network you use, the actual transmission speed will likely be less than the rated speed. This is because various factors cause a degradation of the signal. If a single connection drops below 2 Mbps, the connection could be terminated. If you are having trouble establishing or keeping a wireless connection, consider the following factors: Consideration Description Wireless on/off switch Some portable devices have a physical wireless switch on the outside of the device. The wireless switch turns the device's integrated wireless network adapter on and off. When in the off position, no wireless networks are displayed as available. Airplane Mode Instead of a physical switch, some portable devices have a software-controlled switch called Airplane Mode. When in Airplane Mode, all wireless functionality is disabled. When in Airplane Mode, some wireless functionality (e.g., Wi-Fi or Bluetooth) can be manually enabled individually without needing to disable Airplane Mode. Incorrect configuration The most common source of problems with wireless networking is incorrect configuration. Before considering other problems, verify that the correct SSID and WEP/WPA keys have been configured. Remember that WEP/WPA keys are not case sensitive, but passphrases are case sensitive. In the case of a standalone (or thick) configuration, make sure each individual AP is properly configured. With a controller-based (or thin ) configuration, make sure each AP can communicate with the wireless controller. A similar form of an incorrect configuration is trying to access a wireless network that uses one standard (e.g., 802.11a) with a wireless card that supports a different standard (802.11b or 802.11g). Range Wireless standards have a limited range. Moving a notebook outside the effective range will weaken the signal and likely cause intermittent reception. Moving outside of the stated range can cause the connection to drop entirely. Obstructions In situations where there is no clear line-of-sight between transmitter and receiver due to obstructions (e.g., concrete or metal studs), the wireless signal is reflected along multiple paths before finally being received. This can cause phase shifts, time delays, and attenuation. To address this, antenna diversity implemented, which uses two or more radio antennas to increase the quality and reliability of a wireless link. There are two common antenna diversity implementations:
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  • Spring '14
  • Computer network, Local area network, Network topology, Metropolitan area network

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