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mb8611 | 2.5Gbps DOCSIS 3.1 Cable Modem

"My old modem could max out at around 940mb on Xfinity Gigabit. This new modem gives me 1.4G, nearly 500mb more speed. It sure makes updating large games fast!" –LOTR

mb8611 | 2.5Gbps DOCSIS 3.1 Cable Modem

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  • Compatible with Xfinity, Cox, Spectrum & more
  • Save up to $168* per year vs renting
  • 2 year warranty, Unlimited Support
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"My old modem could max out at around 940mb on Xfinity Gigabit. This new modem gives me 1.4G, nearly 500mb more speed. It sure makes updating large games fast!" –LOTR

  • Description
  • Tech Specs
  • ultra-fast DOCSIS 3.1 performance

    Stream, game, conference and more with confidence. DOCSIS 3.1 supports speeds up to 10x faster with higher efficiency. Also backwards compatible with 32x8 DOCSIS 3.0 so you can future proof your network.

    true multi-gigabit speed

    Don’t let your cable modem throttle your speed. A 2.5 Gbps Ethernet port delivers high-speed connectivity to even the fastest routers and computers.

    works with any router

    Seamlessly pair with any WiFi router to connect all your wireless devices. This cable modem does not have a built-in wireless router or telephone capability.

    superior, but pays for itself

    Savings up to $168 per year on modem rental fees with your internet provider. Certified for Comcast Xfinity, Cox, and Spectrum and compatible with IPv6.

    simple setup and use

    Easy self-installation. Comes with a 2-year warranty and free support from our team of US-based technicians.

    motosync app

    It's like having our product experts in your home with one tap using in-app live chat support.

  • General

    Cable Modem Service Interface

    • F-type female 75 Ω (standard coaxial connector)

    Ethernet Interface

    • One 10/100/1000/2500 Ethernet LAN port


    • Front Panel:
      Power, Downstream, Upstream, Online, LAN
    • Rear Panel:
      The Ethernet port has two LEDs indicating data flow and LAN connection speed.
      – Green indicates 2.5 Gbps
      – Amber indicates 100 Mbps or 1 Gbps
      – Blinking indicates data flow


    • 7 7⁄8" tall x 7 1⁄4" deep x 2 1⁄4" wide
      (200 mm x 184 mm x 57 mm)


    • 18.4 ounces (523 grams)

    Power Adapter

    • DoE-compliant Level VI energy-saving, UL-listed power adapter with 12 Volt DC, 1.5 Amp output and 100-240VAC universal input
    • NEMA 1-15 (North American style) 2-prong plug is provided in the US.

    Operating Temperature

    • 32° to 104° F (0° to 40° C)


    • FCC 15B, Bureau Veritas 60950-1 ITE safety, CableLabs®, cable service providers

    Surge Protection

    • Industrial-level surge & lightning protection


    • Two years

    Operating Parameters

    DOCSIS Standards

    • DOCSIS 3.1, 3.0, 2.0, 1.1


    • Data Rate:
      Up to 3,780 Mbps*
    • Bonded Channels:
      Up to 32 SCQAM (DOCSIS 3.0) or 2 OFDM (DOCSIS 3.1)
    • Frequency Range:
      108 to 1002 MHz
    • Operating Level Range:
      -15 to +15 dBmV


    • Data Rate:
      Up to 766 Mbps*
    • Bonded Channels:
      Up to 8 SCQAM (DOCSIS 3.0) or 2 OFDMA (DOCSIS 3.1)
    • Frequency Range:
      5 to 42 MHz or 5 to 85 MHz switchable
    • Operating Level Range:
      +65 dBmV (64 QAM, single channel)
      +57 dBmV (64QAM, 4-8 channels)
      +65 dBmV (16 QAM, single channel)
      +65 dBmV (OFDMA)

    Network Protocols


    Application Protocol

    • SNMP v1/v2/v3


    • Web-based management interface utility

    System Requirements

    • The cable modem must be connected to a cable modem service that uses any of the DOCSIS standards – 3.1, 3.0, 2.0, 1.1
    • The supplied power cube plugs into the most common USA power outlet.

    Package Contents

    • DOCSIS 3.1 / 3.0 Cable Modem (no built-in router or phone jacks)
    • Power Adapter (UL listed)
    • Ethernet Cable (Cat 6)
    • Quick Start Flyer

    * Data throughput will be reduced by network overhead. Delivered data speeds are also dependent upon the configuration and capacity of the data-over-cable service on which the MB8611 is used.

    ** This cable modem does not have a built-in wireless router and does not have telephone jacks for support of voice phone calls.

Customer Reviews

Based on 113 reviews
Adam J.
Compact, single-function device…and damn good at it

Motorola cable modems are the simplest way to bring up the WAN without overstuffing your network stack with useless DHCP servers and protocol support you don’t need. This makes these devices exceptionally hardy and reliable.

Gary F.
Love the Speed

I upgraded my internet speed but my old modem didn't offer a fast enough speed for my new service. The speed of this modem maximizes my current speed plus alows for room to grow.

Sumit P.
Modem keeps restarting frequently

Seems the piece I received is faulty, my internet is unstable since I installed it, modem keeps rebooting automatically.

Jeffrey S.
Fast cable modem

I needed to replace my older cable modem to take advantage of the higher speeds my cable company (Comcast) was giving me. This modem does that and so far is rock solid.

Anthony R.
Works great

Great value and easy install