Troubleshooting
• Move the Ericsson W21 to another location. Make sure that the mobile
network signal is still acceptable before finalizing the installation.
• Check that the “Transmit power [dBm]” on the Wireless LAN page is
configured in accordance with your requirements on wireless network
coverage. The maximum transmit power value is “20”.
• Configure the Ericsson W21 Wireless LAN authentication method to
Open. This will verify if the Wireless LAN connection is working without
encryption. If so, the problem is related to the security settings. See the
information below to get help to identifying the problem.
• Verify that the operating system and Wireless LAN interface of the
client supports the Ericsson W21 authentication and encryption method
(WEP 64-bit, WEP 128-bit, WPA, or WPA2). The Ericsson W21
security settings are displayed on the Wireless LAN web page. If the
security method is not supported, configure the Ericsson W21 to use
another method.
• Verify that the network name (SSID) on the Ericsson W21 and the
wireless client are the same. Note that the network name is case-
sensitive.
• If you are using WEP, make sure that the encryption key length (64-bit
or 128-bit) is the same on the Ericsson W21 and the wireless client.
• If you are using WEP, make sure that the wireless client is configured
with the same encryption key as the Ericsson W21. Check that the
encryption key consists of hexadecimal characters only.
• If you are using WPA or WPA2, make sure that the passphrase is the
same on the Ericsson W21 and the wireless client. Note that the
passphrase is case sensitive.
• If Whitelist is enabled, make sure that the wireless client is included on
this list.
• If the wireless client uses a static IP address, make sure that this IP
address is on the same subnet as the Ericsson W21. For instructions
on how to check the client’s IP address, see the operating system
documentation or online help. The Ericsson W21 IP address and
subnet mask is displayed on the LAN page.
• Make sure that your Ericsson W21 network does not use the same
radio channel as other wireless devices in the premises, for example
security systems. The radio channel is displayed on the Wireless LAN
page. To avoid interference, let the Ericsson W21 select a channel
72 1/1551-CRH 102 167 Uen Rev D 2007-11-16