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Motorola Multi-Gig Speed DOCSIS 3.1 Cable Modem | mb8611

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Motorola Multi-Gig Speed DOCSIS 3.1 Cable Modem | mb8611

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  • 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.

  • 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)
    • Velcro® Cable Tie
    • Coax Connection Tool
    • 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 63 reviews
Giovannina S.
It works.

I was hoping to get better speeds from Charter/Spectrum, and it did improve that a little, so for that I’m happy; it’s a decent modem and will be good once we are able to switch to fiber.

Joe M.

Motorola Multi-Gig Speed DOCSIS 3.1 Cable Modem | mb8611 - Comcast Replacement

Mark A.

Installation on Xfinity network was easy. Supplied documentation was lacking. Had an issue when connecting in my whole house network that simply required a power reset of MB8611 that slowed me down for an hour or 2. Did not find that guidance anywhere but received it from a support chat session with Motorola. One item that would be nice is some type of reliable/accurate speed test built into the modem to test cable link speed directly to/from the modem on WAN side, and something to separately test LAN speed from your device/LAN to/from modem. Overall, after about 2 weeks of operation, I am pleased so far and appear to have good connectivity at rated speeds.

Lance K.M.

I got a new house, new connection and needed a new modem. This one worked perfectly when I plugged it in. It was about as easy as It could be. I have not had to contact tech support at all. Great throughput.


It works well without any downtime so far, and was easy to setup with Mediacom. Also works well with Mediacom's new higher speeds.