@JLE 

Usually just connecting PC with Ethernet cable to Satellite Deco is enough. Try both Ethernet ports and if nothing works, the issue must be with either Ethernet cable or with PC configuration.

Sometimes office PCs have static IP address configured for their Ethernet adapter. Check if perhaps yours is set this way. Static IP address configured for the office will not work at your home network.

  @Alexandre.  thanks.

Think I solved it.

Forgot to mention that the PC was connected to the Deco through a switch.

I connected the PC directly to the Deco and everything is working fine.

As read elsewhere, I connected the switch to the second RJ45 port on the Deco.