VAIO User Guide

Reference

# Notes on Using the Wi-Fi(R) (Wireless LAN) Function

Before using the Wi-Fi function, read the following precautions for correct use.

- You cannot bring your VAIO computer back from Sleep mode via Wi-Fi.

- In some countries or regions, using the Wi-Fi products may be restricted by the local regulations.

- Wi-Fi devices work on the 2.4 GHz band, which is used by a variety of devices. They use the technology to minimize radio interference from other devices that use the same band; however, radio interference may still slow communication speeds, reduce communication range, or cause communication failure.

- If both the BLUETOOTH function and the 2.4 GHz Wi-Fi function of your VAIO computer are enabled, interference may occur and cause slower communication speeds or other problems.

- The communication speed and range may vary depending on the following conditions:

- Distance between devices

- Existence of obstacles between devices

- Device configuration

- Radio conditions

- Ambient environment (including wall material, etc.)

- Apps in use
  Communications may be cut off depending on radio conditions.

- The data transfer rate specified in the specification is the theoretical maximum, and may not reflect actual data transfer rate.

- Actual communication speed may not be as fast as the one displayed on your VAIO computer.

- The 2.4 GHz and 5 GHz Wi-Fi frequency bands are not communicable with one another.

- The data transfer rate of IEEE 802.11g and IEEE 802.11n (2.4 GHz) may be affected by interference when used with an IEEE 802.11b product. Also, IEEE 802.11g and IEEE 802.11n automatically lower the transfer rate to maintain compatibility with an IEEE 802.11b product. The transfer rate may be regained by changing the channel settings of your access point.

- To stop the Wi-Fi function abruptly, turn off your VAIO computer.

- 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.

Related Topic
About the Wi-Fi(R) (Wireless LAN) Standards
Starting Wi-Fi(R) (Wireless LAN) Communications
Stopping Wi-Fi(R) (Wireless LAN) Communications
Notes on Using the BLUETOOTH(R) Function