Configure WEP key 4 for service set interfaces. The number of characters required for each WEP key depends on how user sets 'Key Length' and 'Key Type': - If Key Length is 40 bits and the Key Type is 'ASCII', then each WEP key be 5 characters long. - If Key Length is 40 bits and Key Type is 'Hex', then each WEP key must be 10 characters long. - If Key Length is 104 bits and Key Type is 'ASCII', then each WEP Key must be 13 characters long. - If Key Length is 104 bits and Key Type is 'Hex', then each WEP Key must be 26 characters long.