HP Color LaserJet CM2320 Multifunction Printer series - Manual (Page 17)

Back view
11 Power connector
12 DIMM door (for adding additional memory)
13 Hi-Speed USB 2.0 port and network port.
14 Fax ports (HP LaserJet CM2320 Fax Model / CM2320 Memory-Card Model only)
15 Rear door for jam access
ENWW Product walkaround 5