Cable Modems and Gateway Routers

Modem only or a combined gateway?

A modem translates your provider's signal and does nothing else; a gateway adds a router and often Wi-Fi in one box. Modem-only suits people who already own a router or mesh system, because it avoids a double router setup and lets you upgrade Wi-Fi separately. A gateway saves space and cabling but ties your Wi-Fi to one unit. This area also holds some dial-up, DSL and fiber converter products, so check the connector in the title: coax for cable, RJ11 for phone lines.

DOCSIS version, channel count and your plan

Cable modems are rated by DOCSIS version. DOCSIS 3.0 bonds channels, shown as 24x8 or 16x4 for downstream and upstream, and handles mid-range plans. DOCSIS 3.1 adds more efficient modulation and suits gigabit plans. Pick a modem rated above your plan speed, and confirm the provider supports it, since many publish an approved list. A single Gigabit Ethernet port caps one device at 1 Gbit/s, so for multi-gigabit plans look for a 2.5 Gbit/s port.

Questions about Cable Modems and Gateway Routers

Will any cable modem work with my provider?

No. Providers keep lists of approved models, and some will not activate others. Check your provider's list for the exact model and its DOCSIS version before buying, especially for gigabit plans.

Do I need a router if I buy a modem?

Yes, to share the connection. A modem alone serves a single device. For several devices, add a router or mesh system, or choose a gateway with a router built in.

Is DOCSIS 3.0 still enough?

For plans up to a few hundred megabits, a modem with enough bonded channels can be fine. For gigabit plans, or plans likely to rise, DOCSIS 3.1 gives headroom and better efficiency, and is the safer choice.