A data channel is a set amount of frequency used to upload or download data to and from a cable internet provider’s CMTS. Generally, cable modems support more downstream channels than upstream ones. The more downstream channels a modem supports, the more megabits you can download each second. For example, a modem listing 4×4 means it has an equal number of downstream and upstream channels. A 32×8 modem has 32 downstream channels but just 8 upstream ones. The DOCSIS version also applies in terms of speed. A 32×8 modem based on DOCSIS 3.0 has a maximum download speed of 1,400 Mbps while DOCSIS 3.1 enables 10,000 Mbps. Check out our guide on the best modems for gigabit internet if you want to replace your provider’s unit.