LED number five on the 7716 meaning

Issue

LED number five on my 7716 flashes constantly what does this mean?

Product Line

TAC I/NET

Environment

I/NET Site

Cause

LED number five on my 7716 flashes constantly what does this mean?

Resolution

This indicates it is transmitting data to the HHC port. The unit is design to do this even if the HHC is not connected. Read more about it in TCON096