Oki Pos 441 - Manual (Page 13)

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4-2-4. Connecting Ethernet Cable
() Make sure the printer is turned off.
() Affix the ferrite core onto the ethernet cable as
shown in the illustration below.
() Pass the fastener through the ferrite core.
(4) Loop the fastener around the cable and lock it.
Use scissors to cut off any excess.
(5) Connect the interface cable to the connector on
the rear panel of the printer.
Ferrite core
Ethernet cable
1 cm
(maximum)
Fastener