HP LaserJet Enterprise 600 Printer M603 series - Manual (Page 25)

Interface ports
1
2
3
4
5
1 RJ-45 Network connection
2 Power connection
3 Host USB connection, for adding fonts and other third-party solutions (this connection might have a removable cover)
4 Slot for a cable-type security lock
5 Hi-speed USB 2.0 connection, for connecting directly to a computer
Serial number and model number location
The label that contains the model and serial numbers is on the back of the product.
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