User's Manual

Chapter 27 Troubleshooting 224
To optimize the speed and quality of your wireless connection, you can:
• Move your wireless device closer to the AP if the signal strength is low.
• Reduce wireless interference that may be caused by other wireless networks or surrounding
wireless electronics such as cordless phones.
• Place the AP where there are minimum obstacles (such as walls and ceilings) between the AP and
the wireless client.
• Reduce the number of wireless clients connecting to the same AP simultaneously, or add
additional APs if necessary.
• Try closing some programs that use the Internet, especially peer-to-peer applications. If the
wireless client is sending or receiving a lot of information, it may have too many programs open
that use the Internet.
 What wireless security modes does my Device support?
Wireless security is vital to your network. It protects communications between wireless stations,
access points and the wired network.
The available security modes in your ZyXEL device are as follows:
• WPA2-PSK: (recommended) This uses a pre-shared key with the WPA2 standard.
• WPA-PSK: This has the device use either WPA-PSK or WPA2-PSK depending on which security
mode the wireless client uses.
• WPA2: WPA2 (IEEE 802.11i) is a wireless security standard that defines stronger encryption,
authentication and key management than WPA. It requires the use of a RADIUS server and is
mostly used in business networks.
• WPA: Wi-Fi Protected Access (WPA) is a subset of the IEEE 802.11i standard. It requires the use of
a RADIUS server and is mostly used in business networks.
• WEP: Wired Equivalent Privacy (WEP) encryption scrambles the data transmitted between the
wireless stations and the access points to keep network communications private.
27.6 USB Device Connection
 The Device fails to detect my USB device.
1 Disconnect the USB device.
2 Reboot the Device.
3 If you are connecting a USB hard drive that comes with an external power supply, make sure it is
connected to an appropriate power source that is on.
4 Re-connect your USB device to the Device.