ARRIS SURFboard S34 DOCSIS 3.1 Multi-Gig Cable Modem, 2.5Gbps + 1Gbps Ethernet Ports, Compatible with Xfinity, Cox & Spectrum, Next Gen Upstream

The S34 combines DOCSIS 3.1 technology with a 2.5 Gigabit Ethernet port to unlock multiGig internet plans and support for next generation upload speed tiers. Future proof your home network!

Features

• Multi‑Gig speed for today & tomorrow: DOCSIS 3.1 performance supports cable internet plans up to 2.5 Gbps, delivering ultra‑fast streaming, gaming, and downloads.
• Future Proof Upstream: Support for the next generation upload speed tiers offered by cable internet providers.
• Save on rental fees: Own your modem and avoid monthly equipment charges—check with your cable provider for plan compatibility.
• Compact, modern design: Space‑saving footprint with simple LED indicators for power, upstream/downstream, and online status.
• Easy setup: Connect cable, power on, and activate with your cable provider. Then connect a Wi‑Fi router to the Ethernet port for home Wi-Fi coverage.
• Modem only: This cable modem requires a separate Wi-Fi router or mesh system for home Wi-Fi network.
• Fast Ethernet: Provides a 2.5 Gigabit Ethernet port to support connecting high speed Wi-Fi routers. Plus, a 1 Gigabit Ethernet port lets you connect an additional wired device or backup handoff (service provider configuration dependent).
• Provider compatibility: All SURFboard modems are CableLabs certified to work across major US Internet Service Providers. Tested and qualified for use with Cox, Xfinity, and Spectrum. Check with your provider to confirm device model support.
• Not compatible with fiber, DSL, or satellite services.
  

General & Compatibility Questions

Q: Does the ARRIS SURFboard S34 have built-in Wi-Fi?

A: No. The ARRIS SURFboard S34 is a standalone modem only and does not broadcast a Wi-Fi signal. To get wireless coverage in your home, you must plug a separate Wi-Fi router or Mesh Wi-Fi system (such as NETGEAR Orbi, Google Nest, or TP-Link Deco) into the modem’s Ethernet port.

Q: Is the ARRIS SURFboard S34 compatible with my Internet Service Provider (ISP)?

A: The S34 is CableLabs certified and approved for major U.S. cable internet providers, including:

• Comcast Xfinity

• Charter Spectrum

• Cox Communications

• Mediacom & Sparklight

• Not Compatible: The S34 does not work with Fiber-only providers (e.g., AT&T Fiber, Verizon Fios without ONT handoff), DSL services (e.g., CenturyLink), satellite internet, or landline digital voice/telephone bundles.

Q: Will the ARRIS SURFboard S34 eliminate monthly equipment rental fees?

A: Yes. Replacing your leased modem or gateway with the ARRIS S34 eliminates your ISP's monthly equipment rental charge (typically $15–$18/month), saving you up to $180–$216 per year on your cable bill.

Technical Performance & Hardware Questions

Q: What is "Next Generation Upstream" on the ARRIS S34, and why does it matter?

A: Traditional cable modems cap upload speeds at around 35–40 Mbps. The ARRIS S34 features switchable diplex filters (Low/Mid-split support) engineered for Next-Gen cable network upgrades (such as Xfinity 10G or Cox). This allows cable providers to deliver significantly faster upload speeds—up to 100 Mbps to 500+ Mbps—making it ideal for video calls, livestreaming, and cloud backups.

Q: Why does the ARRIS S34 have two Ethernet ports (2.5 Gbps + 1 Gbps)?

A: The S34 includes two distinct ports for flexible home networking:

1. 2.5 Gbps Ethernet Port: Connects to a Wi-Fi 6E/7 router or Multi-Gig router to pass internet speeds above 1,000 Mbps without a hardware bottleneck.

2. 1 Gbps Ethernet Port: Can be used to connect a secondary device directly, or be utilized according to specific ISP multi-IP provisioning setups.

Q: Can I connect two routers or two devices to the S34's ports at the same time to get two separate internet connections?

A: Generally, no. Most residential cable ISPs only assign one public IP address per household account. If you connect devices to both ports, only the primary device (your main Wi-Fi router connected to the 2.5G port) will receive an internet connection unless your ISP explicitly provides multiple public IP addresses on your plan.

Q: What is the maximum speed supported by the ARRIS SURFboard S34?

A: The S34 is rated for cable internet plans up to 2.5 Gbps download speeds through its 2.5G Ethernet port. It utilizes DOCSIS 3.1 technology with 2x2 OFDM/OFDMA channels alongside 32x8 DOCSIS 3.0 channel bonding for maximum network reliability during peak usage hours.

3. Setup & Troubleshooting

Q: How do I install and activate the ARRIS S34 modem?

1. Connect the coaxial cable from your wall outlet directly into the S34's coax port.

2. Connect an Ethernet cable from the S34's 2.5G port to the WAN (Internet) port on your Wi-Fi router.

3. Plug in the power adapter.

4. Download the SURFboard Central App on your phone (or call your ISP / visit their online self-activation page) to register the S34's HFC MAC address to your account.

Q: What do the LED indicator lights on the front of the S34 mean?

• Power: Solid green indicates the modem is powered on.

• Upstream/Downstream (US/DS): Green or blue flashing indicates searching for signal; solid blue indicates a high-speed DOCSIS 3.1 OFDM connection established.

• Online: Solid green/blue indicates the modem has successfully connected to your ISP’s network and internet is live.

Q: How does the ARRIS S34 compare to the older ARRIS S33?

A: While both the S33 and S34 feature a 2.5G Ethernet port and DOCSIS 3.1 technology, the ARRIS S34 is optimized for Next-Generation Upstream service tiers. The S34's updated internal architecture supports the mid-split frequency upgrades being deployed by cable providers for substantially faster upload speeds.