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ARRIS SURFboard S34 DOCSIS 3.1 Cable Modem

A DOCSIS 3.1 cable modem with one 2.5 Gbps and one 1 Gbps Ethernet port, built for multi-gig cable plans.

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ARRIS SURFboard S34 cable modem on a kitchen counter beside a vase of yellow flowers
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Photo: ARRIS

Key facts

DOCSIS
DOCSIS 3.1; 2 downstream x 2 upstream OFDM channels and 32x8 bonded DOCSIS 3.0 channels
Plans (maker)
Best for cable plans up to 2.5 Gbps; marketed as optimized for next-generation upload speeds
Ethernet
1x 2.5 Gbps, 1x 1 Gbps
Wi-Fi
None: pair it with a router or mesh system
Voice
No digital voice capability
ISP compatibility (maker claim)
Compatible with Cox, Spectrum, Xfinity and other major US cable providers; the maker says compatibility can vary by model and provider
Warranty
2-year limited warranty

Which version should you buy?

This page covers: SURFboard S34 standalone modem, new.

  • S34 cable modem

    This page

    Model: S34

    What differs
    Standalone modem with one 2.5 Gbps and one 1 Gbps Ethernet port. ARRIS identifies it as optimized for next-generation upload speeds.
    Best for
    Buyers wanting the S34 upload capability with a separate router, where their cable provider supports it.
    Check price on Amazon

  • S33 cable modem

    Model: S33

    What differs
    A different standalone modem with the same listed Ethernet port speeds. The maker’s comparison marks next-generation upstream support on S34, not S33.
    Best for
    Buyers whose cable provider and upload requirements are satisfied by S33.

  • G34 modem and Wi-Fi router

    Model: G34

    What differs
    Combines a cable modem and Wi-Fi 6 router, with four gigabit Ethernet ports. The maker lists it for cable plans up to 1 Gbps.
    Best for
    Buyers wanting one device for both the modem and Wi-Fi router.

Watch out

  • S33 and S34 share the same port arrangement; check the model number rather than the port photos.
  • G34 includes a Wi-Fi router; S34 and S33 need a separate router for Wi-Fi.
  • S34’s two Ethernet ports do not mean it is a two-unit kit.

Why people pick it

  • 2.5 Gbps port plus a second 1 Gbps port
  • Two-year warranty
  • DOCSIS 3.1 with 2 upstream OFDM channels

Know before you buy

  • No voice (phone) support
  • No Wi-Fi: needs a separate router
  • Official images are small (600 px)

Full specifications

DOCSISDOCSIS 3.1; 2 downstream x 2 upstream OFDM channels and 32x8 bonded DOCSIS 3.0 channels
Plans (maker)Best for cable plans up to 2.5 Gbps; marketed as optimized for next-generation upload speeds
Ethernet1x 2.5 Gbps, 1x 1 Gbps
Wi-FiNone: pair it with a router or mesh system
VoiceNo digital voice capability
ISP compatibility (maker claim)Compatible with Cox, Spectrum, Xfinity and other major US cable providers; the maker says compatibility can vary by model and provider
Warranty2-year limited warranty
FCC status (checked Nov 1, 2026)Standalone modem with no router. The only Vantiva approval in DA 26-1130 is its CWA438TX router; the FCC notice does not say whether bridge-only modems fall under the router rule

From manufacturer documentation, checked November 2, 2026. Spotted an error? Tell us.

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