SMC Networks SMC2804WBR V.2 - Manual (Page 59)

Advanced Setup
57
Security
If you are transmitting sensitive data across wireless channels,
you should enable Wi-Fi Protected Access (WPA) or Wired
Equivalent Privacy (WEP) encryption. Encryption security
requires you to use the same set of protocol (WPA or WEP)
and encryption/decryption keys for the Wireless Barricade™
and all of your wireless clients.