Motorola MB8611 DOCSIS 3.1 Multi-Gig Cable Modem (2.5 Gbps)

Unlock gigabit-plus internet with the Motorola MB8611. This DOCSIS 3.1 modem is approved for use with major cable ISPs and features a 2.5 GbE port, low-latency AQM, and seamless pairing with any Wi-Fi router.

Key Features

• DOCSIS 3.1 (backward compatible with 32x8 DOCSIS 3.0)
• 2.5 Gbps Ethernet for multi-gig routers, PCs, and NAS
• Lower latency with Active Queue Management (AQM) for smoother gaming, streaming, and video calls
• Own your modem and avoid monthly rental fees
• Works with any Wi-Fi router (no Wi-Fi or telephony built in)

Compatibility

Approved for most plans with major cable providers:

• Comcast Xfinity
• Spectrum (Charter)
• Cox
• RCN (Astound) in many regions

Important: Plan speeds and approval can vary by region. Check with your ISP to confirm support for your specific service tier.

Specs

Performance

• Downstream: Gigabit-plus (varies by ISP and plan)
• Upstream: Up to ~800 Mbps when supported by your plan

What’s Included

• Motorola MB8611 Cable Modem
• Ethernet Cable
• Power Supply
• Online Installation Guide

Why Buy

• Save money: Owning typically saves up to ~$168/yr vs. renting (varies by ISP)
• Future-ready: Multi-gig LAN with 2.5 GbE
• Smoother experience: AQM reduces lag and buffering

Setup (3 Steps)

1. Connect coax → power → Ethernet (to your router or computer).
2. Activate with your ISP (app, web portal, or phone support).
3. If using a router, set WAN to auto/DHCP and connect to the modem’s 2.5 GbE port.

FAQ

Does the MB8611 have Wi-Fi?
No. It’s a standalone cable modem. Pair it with any Wi-Fi router or mesh system.

Does it support voice/telephone service?
No. If you need voice, choose a modem with telephony (eMTA) support.

Is it compatible with my speed tier?
Yes for most Xfinity/Spectrum/Cox plans up to gigabit-plus. Verify your exact plan with your ISP.

How much can I save?
ISP rental fees vary, but many users save around $10–$15/month by owning their modem.