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Motorola MB8611 DOCSIS 3.1 Modem

Motorola MB8611 is one of the prominent DOCSIS 3.1 modems on the market. The 32 x 8 channel bonding, exceptional AQM technology, and a 2.5 Gbps ethernet port make it a future-ready cable modem for Gigabit and Multi-Gigabit internet plans.

Priced at $189.99, it’s supposed to offer top-tier performance like its rival, Arris S33. I paired the MB8611 modem with Xfinity’s 2 Gbps plan to determine its full potential and capabilities. And since I chose to test it for a multi-gig internet connection, I had TP-Link Archer AX90 for the routing part.

After using this setup for 45 days, I feel I can talk about its highlights, advantages, and misses. But before I dig into the detailed review of the Motorola MB8611, quickly go through the specs on offers. (Skip to the review)

Motorola MB8611 Specs

TechnologyDOCSIS 3.1
Backward CompatibilityYes
Channel Bonding32 x 8
Ports1 x 2.5 Gbps Ethernet
Phone JackNo
Modem Router ComboNo
Suitable Internet PlanUp to 2.5 Gbps
Compatible ISPsXfinity, Cox, Spectrum, Mediacom, Midco,
Breezeline, Astound, and WOW! Internet.
IPv6 SupportYes
ProcessorQualcomm Broadcom
NAND Storage128MB
Dimensions7.88 x 7.25 x 2.25 inches
Weight1.15 pounds

Motorola MB8611 Review: After 45 Days of Use

If speed is one of your primary concerns, you cannot go wrong with the Motorola MB8611 DOCSIS 3.1 modem. It’s precisely cut out for multi-gig internet plans.

In my tests, I found it super effective in traffic prioritization, congestion management, and, obviously, throughput.

Furthermore, there are several physical and intrinsic aspects to look at. In the subsequent sections, I shall unearth almost everything about Motorola’s high-end cable modem by reviewing every attribute and aspect I discovered.

Just so you know, it’s an upgrade to the Motorola MB8600, launched a long time back but still in demand due to its exceptional performance and speed capabilities. Imagine what you can expect from its successor!

Suggested read: MB8611 vs MB8600

Speeds & Performance

If raw speeds are concerned, MB8611 from Motorola is good enough to peak at 2.5 Gbps. Upon pairing it with Xfinity 2 Gig plan, the modem could help reach a maximum download speed of 1952 Mbps.

Motorola MB8611 Speed Test

Upload speed, on the other hand, was clocking 178 Mbps. Wired speeds were close to 1990 Mbps and 199 Mbps in download and upload, respectively.

Adding to the Motorola MB8611 speed is the AQM functionality for better traffic prioritization. This feature is expected to come in handy in reducing ping and latency to an extent. And that’s why MB8611 is featured in my list of recommended gaming modems.

Ports & Connectivity

The MB8611 modem isn’t replete with an additional ethernet port as present on its competitor, Surfboard S33, but with a single high-speed 2.5 Gbps ethernet slot in play, you need not look for anything else. But the lack of Link Aggregation support can be an issue if you plan on using two IPs to ramp up the speeds. Apart from that, a dedicated port is in the rear to accommodate the coaxial input.

Recommended Comparison: Motorola MB8611 vs Arris S33

Compatibility with ISPs

While I tested this cable modem for Xfinity by Comcast, it also works with other internet providers. I’ve listed them below, along with their ideal service package.

  • Cox Internet — Gigablast Plan
  • Spectrum Internet — Internet Gig Plan
  • Astound Broadband — Gig Internet Plan
  • Mediacom Xtream — Internet 1 GIG Plan
  • WOW Internet — Internet 1 Gig Plan
  • Midco — Gig Internet Plan
  • Breezeline — 1000 Mbps Plan

Motorola MB8611 Setup

Motorola MB8611 Setup

The refreshingly straightforward setup arrangement adds to the multi-ISP compatibility, allowing you to get the modem up and running within minutes.

Design & Build

The aesthetics associated with Motorola MB8611 are pretty standard, with this cable modem assuming a rectangular, plastic-clad form factor. Also, the weight for the same is set at a manageable 1.15 pounds, which furthers the portability quotient.

Coming to the dimensions, the modem measures 7.88 x 7.25 x 2.25 inches, making it one of the thicker options. However, the well-ventilated layout more than makes up for the chunkier chassis by keeping it exceptionally cool, even under demanding circumstances.

Furthering the design-specific elements are the usual LED lights, with Motorola making way for five front-facing status reporting lights for accurately identifying network status. And that’s not it. Two rear-adhering LEDs are in play to report the status of the standalone ethernet port.

Hardware & Associated Technologies

The hardware setup deserves a special mention, with Motorola paving the way for a standard power-efficient Broadcom processor and 512MB of RAM to ensure minimal latency. And on top of that, there is 128MB of storage space to keep the firmware insights handy.

The hardware configuration brings in a wide range of possibilities for this cable modem. This includes ARM-powered performance boosts and the availability of the DOCSIS 3.1 standard. Note that DOCSIS 4.0 has been announced, yet it will take time to implement.

While the DOCSIS 3.1 technology with 2 x 2 OFDM/OFDMA compatibility is a futuristic asset, the MB8611 is even backward compatible with the 32 x 8 channel bonding support offered by the DOCSIS 3.0 networking standard.

Adding to the overall specs of Motorola MB8611 is the availability of proactive circuitry that can easily handle power surges. Plus, the modem supports IPv4 and IPv6 standards for better auto-configuration and dynamic QoS (quality of service).

Motorola MB8611: Pros and Cons


    • Multi-Gig internet speeds
    • Supports multiple ISPs
    • No heating
    • Easy to set up
    • AQM for low latency
    • Aesthetic design


    • Expensive
    • Only one port
    • No Link Aggregation

Frequently Asked Questions

Which routers work best with the Motorola MB8611?

Cable modems work with a wide range of routers. However, I’d suggest getting one with a 2.5G WAN port. While testing and reviewing Motorola MB8611, I used TP-Link Archer AX90, a tri-band Wi-Fi 6 router.

Is the MB8611 a good modem for gamers?

Yes, bolstered with Active Queue Management support and IPv6-powered QoS and prioritization, the Motorola MB8611 comes across as one of the better gaming modems around, as it keeps latency to a minimum.

Does the Motorola MB8611 work well with low-speed internet plans?

Yes, you can use the MB8611 for low-speed cable internet plans if you are willing to maximize throughput by relying primarily on wired connections.


Overall, the Motorola MB8611 is one of the more dependable multi-Gig cable modems, best known for its future-proof connectivity standard and an enviable processing setup. And to top it all, this is one of the few devices to throw in surge protection support to increase the longevity of the internal circuitry, making it a great buying option.

Motorola MB8611
Motorola MB8611
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