2 port Gigabit Ethernet switch with advanced routing capability
The keyword is "switch" in the statement. The 2 ports on your CGM4141 is essentially a switch on your personal, private, in-home network.
When you connect a modem to the Cox network, Cox will assign only 1 public IP address to 1 port on your residential modem. It's usually Port-1. You can connect whatever you want to Port-1 for that public address: PC, router, game-console, TV. Whatever you connect to Port-1 (public address) will have Internet access.
If you connect a router to Port-1, the router will have Internet access. If you in-turn connect a laptop to the router, the router will then assign a private IP address to the laptop and then the laptop will have Internet access. Repeat as necessary for more private addresses on your private network.
Port-2 is a switch on your private network. It's a 1-port switch. Whatever you have connected to Port-1 can communicate with Port-2...privately...because it's on the same subnet. However, only the device(s) connected to Port-1 will have Internet access.
The "advanced routing capability" in the same statement probably means Port-2 has high-speed routing capabilities (Layer-3) but without Internet (WAN) connectivity. Cox will have to clarify that snippet.
If you want Cox to assign 2 public IP addresses to a modem with 2 WAN ports, you'd probably pay extra or require a Business account...and possibly a different modem.
