Lexmark C 910 - Manual (Page 42)

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Attach cables
— Token-Ring networks (Shielded Twisted Pair) use a DB9
connector
— Ethernet 10Base2 networks (Thin Coax) use a
BNC T-connector
The printer automatically adjusts itself for the network speed.
Local printing
You can attach your printer locally using either a USB port or a
parallel port.