RTL lan port

In my new AC88U I have the following port link state for the lan:

Port Link State
LAN 8 (RTL) Down
LAN 7 (RTL) 1000 Mbps
LAN 6 (RTL) 100 Mbps
LAN 5 (RTL) 100 Mbps
LAN 4 100 Full Duplex
LAN 3 Down
LAN 2 1000 Full Duplex
LAN 1 1000 Full Duplex
WAN 100 Full Duplex

What is the (RTL) after the lan port from 5 to 8?
They are not gigabit ports?

thank you