What ports are available on the back of the HP Color LaserJet Pro MFP 3301-3304/3388?
The back of the printer includes a USB port, an Ethernet port, a power connection, and — on fax models only — two fax ports: a 'line in' port and a telephone 'line out' port. (Page 6)
From the official HP Color Laserjet Pro Mfp 3301 3304 3388 Printer manual, page 6
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