Évaluations - 2, GPA: 5
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Ordinateurs portables - VPCF22S8E_B (471.57 kb)
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WLAN standard Frequency band Remarks IEEE 802.11a 5 GHz Available only on models compliant with the IEEE 802.11a/b/g/n standard. IEEE 802.11b/g 2.4 GHz The IEEE 802.11g standard provides higher-speed communications than the IEEE 802.11b standard. IEEE 802.11n 5 GHz/2.4 GHz On models compliant with the IEEE 802.11b/g/n standard, only the 2.4 GHz band can be used. Using Your VAIO Computer > Using the Wireless LAN n 66 N Notes on Using the Wireless LAN Function General notes on using the wireless LAN function . In some countries or regions, using WLAN products may be restricted by the local regulations (e.g. limited number of channels). . The IEEE 802.11a standard and the IEEE 802.11n standard are not available on ad-hoc networks. . The 2.4 GHz band, with which wireless LAN devices work, is used by various devices. Although the wireless LAN devices use the technology to minimize radio interference from other devices that use the same band, such radio interference may cause slower communication speeds and narrower communication ranges or communication failures. . The communication speed and range may vary depending on the following conditions: . Distance between communication devices . Existence of obstacles between devices . Device configuration . Radio conditions . Ambient environment that includes existence of walls and materials of such walls . Software in use . Communications may be cut off depending on radio conditions. . Actual communication speed may not be as fast as the one displayed on your computer. . Deploying WLAN products compliant with different standards that use the same band on the same wireless network may reduce the communication speed due to radio interference. Taking this into consideration, WLAN products are designed to reduce the communication speed to ensure communications with another WLAN product if it is compliant with a different standard that uses the same band. When the communication speed is not as fast as expected, changing the wireless channel on the access point may increase the communication speed. Using Your VAIO Computer > Using the Wireless LAN n 67 N Note on the data encryption The WLAN standard includes the encryption methods: Wired Equivalent Privacy (WEP), which is a security protocol, Wi-Fi Protected Access 2 (WPA2), and Wi-Fi Protected Access (WPA). Proposed jointly by the IEEE and Wi-Fi Alliance, both WPA2 and WPA are specifications of standards based on interoperable security enhancements that increase the level of data protection and access control for existing Wi-Fi networks. WPA is designed to be forward compatible with the IEEE 802.11i specification. It utilizes the enhanced data encryption Temporal Key Integrity Protocol (TKIP) in addition to user authentication using 802.1X and Extensible Authentication Protocol (EAP). Data encryption protects the vulnerable wireless link between clients and access points. Besides that, there are other typical LAN security mechanisms to ensure privacy, such as: password protection, end-to-end encryption, virtual private networks, and authentication. WPA2, the second generation of WPA, provides stronger data protection and network access control and is also designed to secure all versions of 802.11 devices, including 802.11b, 802.11a, 802.11g, and 802.11n standards, multi-band and multi-mode. In addition, based on the ratified IEEE 802.11i standard, WPA2 provides government grade security by implementing the National Institute of Standards and Technology (NIST) FIPS 140-2 compliant AES encryption algorithm and 802.1X-based authentication. WPA2 is backward compatible with WPA. Using Your VAIO Computer > Using the Wireless LAN n 68 N Starting Wireless LAN Communications You first need to establish wireless LAN communications between your computer and an access point (not supplied). See Windows Help and Support for more information. For help on setting up a wireless network, click Start, All Programs, and VAIO Easy Connect, and then follow the on-screen instructions of the Easy Internet Connection Setup. ! For details on how to select the channel that will be used by the access point, see the manual that came with your access point. To start wireless LAN communications 1 2 Make sure an access point is set up. See the manual that came with your access point for more information. Turn on the WIRELESS switch. 3 4 Click Start, All Programs, and VAIO Smart Network or click the VAIO Smart Network iconClick the switch next to Wireless LAN to toggle it to On in the VAIO Smart Network window. Make sure the WIRELESS indicator light turns on. on the taskbar. 5 Click or on the taskbar. 6 Select the desired access point and click Connect. Using Your VAIO Computer > Using the Wireless LAN n 69 N Stopping Wireless LAN Communications To stop wireless LAN communications Click the switch next to Wireless LAN to toggle it to Off in the VAIO Smart Network window. ! Turning off the wireless LAN function while accessing remote documents, files, or re...
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