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White rectangular cable modem with vertical vents, front LED row, rear 2.5 Gbps and 1 Gbps Ethernet ports

ARRIS

ARRIS S33-RB DOCSIS 3.1 Cable Modem 2.5 Gbps Port

SKU CH-8VH6-38EX5

A DOCSIS 3.1 cable modem with a 2.5 Gbps port for plans up to 3.5 Gbps

  • DOCSIS 3.1 modem supports plans up to 3.5 Gbps
  • 5 Gbps Ethernet port enables multi-Gig wired connections
  • 32 downstream DOCSIS 3.0 channels boost throughput
  • Works with Cox, Spectrum, Xfinity and other major U.S. providers
  • Second 1 Gbps Ethernet port adds flexible device linking

SURFboard S33 DOCSIS 3.1 Cable Modem

The SURFboard S33 is a DOCSIS 3.1 cable modem designed for residential subscribers who want to stop paying monthly rental fees. It supports cable internet speed plans up to 3.5 Gbps and works with major U.S. providers including Cox, Spectrum and Xfinity. The unit provides one 2.5 Gbps Ethernet port and one 1 Gbps Ethernet port for wired connections.

Multi-Gigabit home networking focus

This modem suits households that need multi-Gigabit wired throughput for routers, mesh systems or high-performance PCs. It is not for buyers who require a built-in Wi-Fi router or multiple 2.5 Gbps ports for several wired devices. Subscribers on networks that do not support DOCSIS 3.1 should verify compatibility before purchasing.

2.5 Gbps Ethernet port decides fit

The single 2.5 Gbps Ethernet port is the specification that determines whether this modem matches the local network backbone. If the connected router or firewall only accepts 1 Gbps input, the extra headroom cannot be used. Buyers needing more than one multi-Gigabit uplink should look at a different device.

Highlights

  • DOCSIS 3.1 modem supports plans up to 3.5 Gbps
  • 5 Gbps Ethernet port enables multi-Gig wired connections
  • 32 downstream DOCSIS 3.0 channels boost throughput
  • Works with Cox, Spectrum, Xfinity and other major U.S. providers
  • Second 1 Gbps Ethernet port adds flexible device linking

Specifications

BrandArris

Questions about this item

Will the 2.5 Gbps Ethernet port need replacement if I upgrade my router later?

The 2.5 Gbps port supports multi-gigabit plans up to 3.5 Gbps, so it stays compatible with newer routers that also have 2.5 Gbps or 1 Gbps ports.

What limits throughput first during a sustained 3.5 Gbps download?

The DOCSIS 3.1 downstream OFDM channels and the 2.5 Gbps Ethernet port set the ceiling; the 1 Gbps port cannot pass more than its rated speed.

How much heat does the S33 produce when running all day at full speed?

The modem is fanless and designed for continuous operation; typical surface temperatures stay warm but within normal limits for a DOCSIS 3.1 device.

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