Epson 802.11g Reference Manual page 17

Security
WEP (Wired Equivalent Privacy) is a security protocol for
wireless network. Data is encrypted using the WEP Key
providing the security of your wireless network. You must set the
same WEP Key to the network interface and the access point.
The network interface supports a 64-bit or 128-bit encryption key,
and you can use either hexadecimal or ASCII characters.
WPA-PSK(TKIP) is a Wi-Fi security with a strong encryption
algorithm as well as user authentication. It provides a high
security that user data remains protected and that only authorized
users may access the network.
Note:
The wireless transmission speed is reduced when WEP or
WPA-PSK(TKIP) is enabled because time is required for encryption and
decryption.
SSID is a unique identifier to specify a wireless LAN. All devices
and access points connected to a specific wireless LAN must use
the same SSID to communicate with devices on the wireless LAN.
Radio signal range
The data transfer rate of the network interface depends on the
environment where the network interface is located.
Note:
The wireless transmission speed decreases as the distance between the
network interface and the computer or the access point increases.
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