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The Motorola MB8611 ultra-fast DOCSIS 3.1 cable modem supports true Gigabit (plus!) speed tiers with a 2.5 GB Ethernet port. Approved for Comcast Xfinity, Cox, and Charter Spectrum services only, this cable modem is backward compatible with 32×8 DOCSIS 3.0. Supporting the only standard that can deliver speeds over 1 Gbps/sec, this DOCSIS 3.1 Cable Modem has been approved for all multi-Gigabit speed tiers by Comcast Xfinity, Charter Spectrum, and Cox. The MB8611 is equipped to keep you connected, now and in the future, with backward compatibility to 32×8 DOCSIS 3.0. A speedy 2.5GbE port enables faster, more reliable Internet for lag-free streaming, gaming, and more.


  • Ultra-Fast DOCSIS 3.1 Performance: Delivers true gigabit-plus speeds. Supports fast internet plans with Comcast Xfinity, Cox, and Spectrum. Backward compatible with 32×8 DOCSIS 3.0.
  • Pairs with Any WiFi Router: Seamlessly compatible with any WiFi router to connect all your devices. This cable modem does NOT have a built-in wireless router or telephone call capability.
  • Multi-Gigabit Ethernet Speed: A 2.5 GB Ethernet port delivers true high-speed connectivity to even the fastest routers and computers, providing downstream speeds just below 2,500 Mbps and upstream speeds up to 800 Mbps when supported by your internet service plan.
  • Fast Streaming, Conferencing, Gaming: Applies Active Queue Management (AQM) for reduced Internet latency and better app performance, including online gaming, conferencing, and streaming.
  • Extreme Cost Savings: Owning your own modem typically saves the home $168 per year in monthly rental charges. (Savings described are for Comcast Xfinity and vary by service provider.)
  • Built for Reliability: Motorola is a worldwide leader in technology people depend on.


  • Brand: Motorola
  • Size: DOCSIS 3.1 (2.5 Gbps Ethernet Port)
  • Dimensions: 6.86 x 10.40 x 10.36 Inches
  • Weight: 2.14 Pounds
  • Internet service provider: Comcast Xfinity, Cox Communications, Charter Spectrum
  • Connectivity Technology: Ethernet, WiFi
Weight 1 lbs