The best replacement for gigabit ethernet is fast ethernet.

The best alternatives to gigabit ethernet are rated as following:

★★★★★	fast ethernet
★★★★★	atm
★★★★★	firewire 800
★★★★	10 100
★★★★	usb 2.0
★★★	usb 3.0
★★★	thunderbolt
★★★	esata
★★★	ethernet
★★	wireless ac
★★	10/100 ethernet
★★	firewire
★★	100
★★	10 gigabit ethernet
★	infiniband
★	usb2
★	usb 3
★	802.11n
★	wireless n
★	10 100 ethernet
★	fibre channel
★	usb 3.0 speed
★	usb 2
	usb 2.0 what is faster
	fw800
	100baset ethernet
	fddi
	10 mbps ethernet

Your alternative for gigabit ethernet is not listed? Suggest!

Speaking about gigabit ethernet, one probably shouldn't forget about cat5e.

Other search terms related to gigabit ethernet and their ratings are:

★★★★★	cat5e
★	cat 5e

You have in mind a companion for gigabit ethernet and it is not yet here? Propose!

Google Trends

Scale is based on the average worldwide traffic of gigabit ethernet in all years. Click on graph for more.

gigabit ethernet

fast ethernet

atm