HP LaserJet M5025 Multifunction Printer series - Manual (Page 20)

Interface ports
The device has one EIO slot and three ports for connecting to a computer or a network.
1 EIO slot
2 "Heartbeat" LED
3 Hi-Speed USB 2.0 connection
4 USB accessory connection
5 Foreign interface harness (FIH) port
6 Network connection
7 Fax connection (for connecting to an optional analog fax accessory)
8 Chapter 1 Basics ENWW