Hitachi WJ200 Series Quick Reference Manual page 19

For more details, please refer to the instruction manual of WL200 / WL200.
5.4 Install the ferrite core
Install the ferrite core (included in shipment) on the LAN cables (both IN and OUT)
communications connectors. (If the communications cable on the OUT side is not connected, install
the ferrite core for the IN side only.)
NOTE: Please fix the connected LAN cables.
Chapter 5 Wiring, Connecting
13
near the