Comcast speed test shows 4Gbps upstream and downstream over cable

Comcast, the largest U.S. provider of gigabit broadband Internet services, has demonstrated internet speeds greater than 4 gigabits per second (Gbps) in both directions over a cable network.

The test was conducted on Broadcom’s full duplex DOCSIS 4.0 chip, which will support future multigigabit upload and download speeds. By full duplex, it means that the upstream speed is the same as the downstream speed. Normally, most people can get access to a gigabit per second download speeds, but uploading crawls at maybe 20 megabits per second.