HP Color LaserJet CM4730 Multifunction Printer series - Manual (Page 96)

Auxiliary connection
This MFP supports an auxiliary connection for paper handling input devices. The port is located on the
back of the MFP.
NOTE This connector cannot be used by the 3-bin mailbox or stapler/stacker accessories.
Figure 6-3 Auxiliary connection
1 Auxiliary connection port (Jetlink)
80 Chapter 6 Connectivity ENWW