[Elecraft] Connector on bottom right side of the fmain front panel board?

[Mark Goecke]

In the pictures of the K3 boards, for the front panel board, there is a 
connector on the right side of the board that faces downward, through a 
cutout in the front cover.  It looks like a Cat 5 Ethernet connector.  I 
have not been able to find anything in the documentation that describes what 
this connector is for.  Have I overlooked it?  Can someone please tell me 
what that connector is for?

TNX

Mark KC5VF