US = upstream = uploading. Whatever data is coming from your devices on the network through the router, through the modem and then to the ISP.
DS = downstream = downloading. Whatever data you’re receiving from the ISP through the router and then onto your devices.
Your ISP will probably have a recommended / compatible router and modem list. It’s good to go through this list, they might not be the absolute 100% top of the line best devices, but they are more likely to be compatible with your service and cause the fewest issues in troubleshooting if you do have service issues.
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