Channels: Channel bonding refers to the number of downstream (for downloading) and upstream (for uploading) channels your modem can access.

If you’re lucky enough to live in an area where you can choose among multiple ISPs, the capability to bring your modem from one provider to another is a nice bonus. The first thing to do is to check your ISP’s approved-modem list-here’s where to check for Xfinity, Spectrum, Cox, Sparklight, Optimum, Mediacom (PDF), and WOW (PDF). A modem either works with your ISP or doesn’t.

Compatibility: ISP compatibility is the main factor in choosing a cable modem.

But you should call Optimum to verify compatibility before purchasing. Optimum “encourages” DOCSIS 3.1 modems with the company’s service, and DOCSIS 3.0 (24x8) modems are compatible with their service under 500 Mbps. Modem compatibility list, updated February 2023 Cable modem And they may not even let you bring your own modem once they do roll out gigabit service. The added expense of a DOCSIS 3.1 modem isn’t worth it until you’re on one of these new (and pricey) plans-especially since your ISP may roll out gigabit over fiber rather than cable.

You need a DOCSIS 3.1 modem to guarantee gigabit speeds from most cable ISPs, and some ISPs like Sparklight recommend DOCSIS 3.1 modems for new cable modem activations.ĭon’t get a gigabit modem unless you already have gigabit service or know it’s available. If you have a gigabit or multi-gig internet plan and your ISP allows you to use your own modem, the Motorola MB8611 is the best of the DOCSIS 3.1 modems that are widely available right now, thanks to its relatively low price and two-year warranty.

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