Toshiba Tecra A4 (PTA42) - Manual (Page 109)

User’s Manual 7-7
HW Setup and Passwords
Built-in LAN
Do not install or remove an optional memory module while Wake-up on
LAN is enabled.
Wake-up on LAN does not work without the AC adaptor. Leave it
connected, if you are using this feature.
Enabled Enables built-in LAN functions. (Default)
Disabled Disables built-in LAN functions.