HP Color LaserJet Pro MFP M278 - Printer back view

Printer back view
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1 Rear door (access for clearing jams)
2 Serial number and product number label
3 Power connection
4 USB interface port
5 Ethernet port
6 Fax “line in” port for attaching the fax phone line to the printer (fax models only)
7 Telephone “line out” port for attaching an extension phone, answering machine, or other device (fax models only)
8 Duplexer (duplex models only)
ENWW Printer views 3