To help you find the best modem, I tested 19 devices for various factors like compatibility with Xfinity, speeds, latency, and efficiency.
Motorola MB8611
Best Xfinity Modem
DOCSIS Version
DOCSIS 3.1
Channel Bonding
32 x 8
Ports: 1
1 x 2.5Gbps
Suitable Xfinity Plan
Gigabit Extra (1.2Gbps)
Wireless Coverage
NA
My Rating
4.9/5 Stars
ARRIS Surfboard S33
Best Runner Up
DOCSIS Version
DOCSIS 3.1
Channel Bonding
32 x 8
Ports: 2
1 x 1Gbps
1 x 2.5Gbps
Suitable Xfinity Plan
Gigabit Extra or Gigabit
Wireless Coverage
NA
My Rating
4.8/5 Stars
ARRIS G36
Best Modem Router Combo
DOCSIS + WiFi Version
DOCSIS 3.1 + WiFi 6
Channel Bonding
32 x 8
Ports: 5
4 x Gig LAN (Routing Part)
1 x 2.5 Gbps LAN/WAN
Suitable Xfinity Plan:
Gigabit Extra / Gigabit
Wireless Coverage
Up to 3,000 Sq Ft
My Rating
4.9/5 Stars
Whether you’re into high-end activities like gaming and streaming (1000-1200 Mbps), need a mid-range device to handle an 800 Mbps plan, or simply want a 100-200 Mbps capable 2-in-1 gateway that works with Comcast to avoid paying the $14/month equipment rental fee. I’ve ranked and reviewed the top 10 options for 2023.
Note: If you’re getting a standalone cable modem, you’ll need to purchase the best Xfinity router or mesh WiFi system.
Contents
- 10 Best Modems For Comcast Xfinity in 2023 [Reviewed]
- 1. Best Overall: Motorola MB8611
- 2. Best Runner-Up: ARRIS SURFboard S33
- 3. Best Modem/Router Combo: ARRIS SURFboard G36
- 4. Best for Voice: Netgear CM2050V
- 5. Best Voice-Capable Combo: Motorola MT8733
- 6. Best Value for Money: ARRIS SURFboard SB8200
- 7. Best for 800 Mbps: Netgear CM1100
- 8. Best Budget Combo: ARRIS SURFboard G34
- 9. Best for Comcast Business: Hitron CODA56
- 10. Cheapest Option: Netgear CM500
- Complete List of Xfinity Compatible Modems [Officially Supported]
- Xfinity Modem Requirements
- Did You Get a Modem? What’s Next?
- Things To Consider When Buying a Modem
- Frequently Asked Questions
- Verdict
10 Best Modems For Comcast Xfinity in 2023 [Reviewed]
While compatibility with Comcast is important, there are a lot of other things to consider. For instance, the modem should be capable of handling the speeds of the subscribed plan, the latest DOCSIS version, higher channel bonding, and enough ports for all your requirements.
1. Best Overall: Motorola MB8611
If you’re subscribed to Xfinity Gigabit Extra, then Motorola MB8611 is the best option. Specs-wise, it comes with DOCSIS 3.1 technology, 32 x 8 channel bonding, multi-gig port, and AQM, but in practical tests, it has performed better than many other devices.
- Technology: DOCSIS 3.1
- Downstream/Upstream: 32 x 8
- Ports: 1 x 2.5G Ethernet
- Suitable Service Plan: Gigabit Extra (1.2 Gbps)
- Modem-Router Combo: No
It’s a successor to the old MB8600 (which itself was a top-notch device during its time). Compared to the predecessor, it is much better in terms of DOCSIS tech, ethernet port, and others for overall excellent performance.
It’s not a modem router combo, that’s why you should get a compatible router. Since it’s a multi-gigabit modem, pairing it with an underpowered router won’t make sense. That’s why consider getting a high-speed WiFi 6 or 6E router.
Why is it suited for Comcast Xfinity?
Motorola claims that the MB8611 can handle multi-gigabit connections upto 2,500 Mbps. That’s why in my opinion, it makes more sense to use it with Xfinity’s Gigabit Extra (1200 Mbps) plan.
During my tests, I paired it with the Archer AX90 (tri-band WiFi 6 router) that’s capable of handling speeds upto 6600 Mbps.
Based on several speed tests, I could witness a download speed of 1172 Mbps and an upload speed of 189 Mbps. This is a holy grail for gamers and streamers! In the case of basic activities like surfing and video conferencing, the DOCSIS 3.0 fallback is also supported, with 32 x 8 channel bonding technology on offer.
Adding to the speed is DOCSIS 3.1’s AQM functionality for better traffic prioritization. What it does is mark or drop data packets before the queue is full to maintain or drop probabilities and thereby minimize latency.
If your router comes with QOS, it adds a cherry on top, but even without that, I could play Destiny 2, Red Dead Redemption, and others at 95 FPS. The performance remains smooth, even if you’re streaming videos, attending video calls, or active on other tasks simultaneously.
Hardware & Other Features
The MB8611 packs something really powerful inside, as evident from the performance output it generates. Although the manufacturer doesn’t reveal much, there is a power-efficient Broadcom processor and 512 MB RAM to keep latency in check. Further, there’s 128 MB of flash memory to store the key firmware insights.
This hardware configuration ensures faster internet and better movement of data packets. The chipset provides better speeds even during peak hours, whereas the network congestion is taken care of by DOCSIS 3.1.
The device displays theoretical capabilities of up to 3.8 Gbps, but the same is only possible if the ISP launches plans to match up to the DOCSIS 3.1 standard.
Design & Connectivity


Aesthetically, this Motorola modem is pretty standard and assumes a rectangular and plastic-clad form factor. It measures 7.88 x 7.25 x 2.25 inches and weighs 1.15 inches to stay a bit wider and less bulky options. Four indicator lights in the front panel display the status of the device.
Besides, in the rear panel, find a multi-gig ethernet port with 2.5 Gbps of maximum speed capacity. It, with a relevant plan, can transmit data packets at the rate of 1.94 Gbps for downloads and 315 Mbps for uploads. Plugging my gaming console reduces ping value and makes it a worthy choice for gamers.
Conclusion
Overall, Motorola MB8611 is the best choice for an Xfinity Gigabit Extra (1200 Mbps) connection. It doesn’t compromise in any aspect. Its support for AQM and 2.5 Gbps internet speed paves the way for lag-free gaming and seamless streaming.
But a single port and lack of Link Aggregation are some of its letdowns. For more details, you can also read my detailed review of the MB8611.
- DOCSIS 3.1 standard
- 2.5 Gig ethernet port
- Link Aggregation support
- Active Queue Management
- Built-in surge protection
- Only one Ethernet port
- A tad costly
2. Best Runner-Up: ARRIS SURFboard S33
If you somehow do not like the MB8611 and want its best alternative, then go for ARRIS S33. Be it gaming, streaming, or setting up bandwidth-hungry smart home devices, it won’t let you down.
- Technology: DOCSIS 3.1
- Downstream/Upstream: 32 x 8
- Ports: 1 x 2.5G + 1 x Gig Ethernet
- Suitable Service Plan: Gigabit Extra (1.2 Gbps)
- Modem-Router: No
I tested the Arris S33 on Xfinity’s 1200 Mbps, here are my observations:
Firstly, the ARRIS S33 works well with any Xfinity Internet plan, but since it’s a gigabit DOCSIS 3.1 modem, it would make sense to only use it with high-speed plans such as the Xfinity Gigabit & Gigabit Extra.
Upon connecting this modem to a WiFi 6 router, I experienced the highest wireless throughput of 1167 Mbps in download and 191 Mbps in upload in a nearby speed test.
Being one of the top-rated DOCSIS 3.1 devices, it allows you to experience 2 x 2 OFDM channels for enhanced data transmission. Additionally, it has backward compatibility, which allows it to run DOCSIS 3.0 connections from Xfinity too. However, the standard internet plans use 32 x 8 channel bonding.
Using the Ethernet ports to establish direct connections (2.5G or 1G) port lets you experience Gig-level speeds on devices. I tested the same with my Dell laptop and could get over 1187 Mbps in download and 97 Mbps in upload over a wired setup. The gaming and streaming performance had no latency and zero lagging instances.
Hardware & Other Features
The Broadcom multi-core processor makes sense, paired with 1GB (512MB x 2) of RAM. The existing setup allows you to cut through any form of congestion easily. Adding to this is the OFDM/OFDMA support that I already discussed.
And most importantly, the ARM-based chipset ensures that the integrated spectrum analyzer helps you prioritize specific transmission needs with urgency.
Design & Build


My dedicated review of the S33 shows that it is a vertical, plastic-clad device replete with LEDs in the front and standard Ethernet, power, and coaxial cable ports in the rear. Making sense is the rounded structure that lends a sense of stability and solidarity to the entire device.
Also, this white-colored variant weighs 1.52 pounds and measures 5.24 x 5.24 x 1.65 inches, making it quite portable. And most importantly, there are heat-dissipating vents to help avoid overheating.
Conclusion
For a 1200 Mbps high-speed internet plan from Xfinity, S33 makes perfect sense. Its 2.5 Gig port, higher throughput, and seamless internet experience make it one of the fastest cable modems to use with Xfinity Internet.
- Latest networking standards
- Multi-gigabit speeds
- No overheating
- Fresh design pattern
- Pricey
- Overkill for basic plans
3. Best Modem/Router Combo: ARRIS SURFboard G36
- DOCSIS Version: DOCSIS 3.1
- Wireless Standard: Wi-Fi 6 (802.11ax)
- Channel Bonding: 32 x 8
- WiFi Coverage: Up to 3,000 Sq Ft
- Suitable Plan: 1.2 Gbps
- Ports: 1 x 2.5G + 4 x Gig Ethernet
- Processor: Multi-gig
- RAM & NAND Memory: 512MB + 256MB
- App Support: Yes
Kicking off my list with the one that can support the Xfinity 1.2 Gbps plan. ARRIS G36, irrespective of its premium pricing, gets your money’s worth with a range of high-end features.
It establishes itself as a future-proof device with DOCSIS 3.1 and Wi-Fi 6, alongside entailing a 2.5G WAN port which further adds a cherry on the top.
Why is it suited for Xfinity?
The Surfboard G36 bestows excellent capabilities when it comes to speeds, which comes to its aggregated speeds of 3000 Mbps. It’s split into its two frequency bands as follows:
5 GHz: 2401 Mbps | 2.4 GHz: 574 Mbps |
To deduce its real-time performance, I got it to pair with the Xfinity 1.2 Gbps plan and measured the speeds over both bands.
Boasting a much higher speed cap, the 5 GHz recorded download and upload speeds of 1121 Mbps and 59 Mbps, respectively. While on the other one, speeds unfolded at 548 Mbps and 29 Mbps.
All the above-mentioned speeds were measured over a 25 feet distance. However, increasing the distance to 50 feet saw a tad dip in speeds (27-30%), but the signals were stable, courtesy of its 2 x 2 OFDM/OFDMA support.
This lets me glide through any high-bandwidth tasks like stock trading, online gaming, video conferencing, and others.
WiFi Coverage & Devices Capacity
The range of ARRIS G36 is quite expansive, with its two internal antennas claiming to cover 3,000 Sq Ft, which is great considering it is a combo device.
In my tests, the signals could extend up to 2,400-2,600 Sq Ft, which makes it an ideal fit for any three-bedroom apartment. Alongside, the beamforming support of antennas makes way for strong and stable signals everywhere.
Now, its device handling capacity is great when you judge it on the basis of a modem-router combo device. With technologies like OFDM and beamforming, I could connect up to 25 devices, including laptops, smartphones, smart TVs, and others.
Despite playing games for hours, the signal strength stays fine and I didn’t encounter any major lags or throttles.
Ports & Connectivity
This is the area where ARRIS G36 shines primarily because of one of its kind, 2.5 Gbps internet port. It allows users to pair multi-gig plans and experience high-speed gaming with higher FPS and lower ping.
Other than that, there are four Gigabit Ethernet ports with faster and more stable speed output. So, with this device setup, you can add a few more high-bandwidth devices to the mix without any issues.
Security Features
Being a combo device, expecting it to entail anything advanced features would be imprudent. But trust me on this, it has got enough to keep your home network and devices safe from any unwanted and external elements like cyberattacks and intrusions with key technologies like WPA2/WPA3 standards and an SPI firewall.
Moving on, in terms of parental controls, it lets you pause the internet at any time and get an overview of the total online time with its internet dashboard feature.
Conclusion
In conclusion, the spec sheet of ARRIS G36 translates well in the real life as I could attain almost the best performance in every aspect. Even, there is an integrated firewall that keeps any unwanted elements away from the network, making it the best combo choice for Comcast. Read G36’s full review to learn more.
- Wi-Fi 6
- Excellent speeds
- Multi-gig 2.5G port
- Great WiFi range
- Decent security features
- Premium price
4. Best for Voice: Netgear CM2050V
There are quite a lot of modems with phone ports, but when it comes to Xfinity, I’ve used most of them, and none of them is as good as the Netgear CM2050V.
- Technology: DOCSIS 3.1
- Downstream/Upstream: 32 x 8
- Ports: 1 x 2.5G + 2 x Voice
- Suitable Service Plan: Gigabit Extra (1.2 Gbps) + Voice
- Modem/Router Combo: No
If you’ve subscribed to the Voice + Internet bundle, then the Netgear CM2050V is the ultimate solution that can handle Xfinity Triple Play. Also, it is a huge upgrade from the CM1150V, courtesy of the new design, a multi-gig port, and efficient hardware.
Why is it suited for Comcast Xfinity?
The multi-gigabit modem features DOCSIS 3.1 technology and 32 x 8 channel bonding. It is known to support internet plans of up to 2500 Mbps on paper.
In my test with the 1200 Mbps plan, I could get a maximum download speed of 1167 Mbps and an upload speed of 189 Mbps in close range.
As far as the ports are concerned, you get one 2.5 Gbps ethernet slot to get you multi-gig speeds. Plus, there are two phone lines to help you work with the Xfinity Voice service. The raw internet performance, full HD streaming, and gaming tasks were handled like a pro.
Design and Build
Netgear CM2050V looks great in all-black. Made of hardened plastic, it assumes the same vertical layout yet with a fresh look compared to its predecessor. It is also one of the more durable products, with dimensions set at 10 x 9.13 x 4.8 inches. There are also 7 LED lights on its front panel that indicate the status of the modem and connection.
Hardware & Other Features
Netgear doesn’t reveal much about its hardware, specifically the processing unit, RAM, and NAND memory. However, I could breeze through all of the intensive tests that require powerful hardware. It worked fine without getting warm or stuttering, cutting through browsing, streaming, gaming, and voice calling.
As for the other features, you get IPV6 compatibility, QoS functionality, and 2 x 2 OFDMA support for faster connectivity and an integrated bandwidth tuner for improved WiFi speeds.
Conclusion
Led by a 2.5 gig LAN port and two phone jacks, the CM2050V is the perfect modem for Xfinity Voice. It packs a punch and stands out among the existing competition. And to establish relevance, it works even better in business and office setups.
To learn more, check out my detailed review of the CM2050V.
- DOCSIS 3.1 technology
- Xfinity Voice-compatible phone ports
- Seven LED indicator lights
- 2 x 2 OFDMA Channels
- Efficient hardware & performance
- Built-in QoS
- Expensive
- Works only with Xfinity
Alternative Product Suggestion:
If you want a cheaper option with telephone ports, consider the ARRIS SURFboard T25. It offers DOCSIS 3.1, 32 x 8 channels. However, it comes with an Intel Puma 7 chip, which is inferior to most Broadcom chips.
5. Best Voice-Capable Combo: Motorola MT8733
- DOCSIS Version: DOCSIS 3.1
- Channel Bonding: 32 x 8
- Suitable Plan: Gigabit Extra (1.2 Gbps) + Voice
- Ports: 1 x 2.5G + 3 x Gig + 2 x Voice
- Wireless Standard: Wi-Fi 6 (802.11ax)
- WiFi Coverage: Up to 2,500 Sq Ft
- App Support: Yes
Motorola MT8733, an upgrade to MT8702, has taken a step forward both in terms of modem and router specifications, be it speeds, standard, or processing ability.
The latest offering establishes a perfect balance between features and its cost with DOCSIS 3.1, WiFi 6 standard, and two phone ports with features like HD calling, conference calls, and others.
Why is it suited for Xfinity?
MT8733 boasts an aggregated speed of 6000 Mbps, bettering my previous recommendation, which is distributed over the two bands as follows:
5 GHz: 4804 Mbps | 2.4 GHz: 1147 Mbps |
It instills two telephone ports, making it a perfect fit for people who want to make calls via the Internet. Xfinity has bundle (gigabit + voice) plans specially catered to them, and pairing the same with the combo device produced excellent results.
The download and upload speeds were measured at 955 Mbps and 38 Mbps over the 5GHz band, while the values averaged 887 Mbps and 29 Mbps on the 2.4GHz band.
Its best part is the inclusion of OFDMA, MU-MIMO, and beamforming, so signals over a long-range stay stable. So speed drop was less than Arris G34, valuing around 35% over 30 feet.
WiFi Coverage & Devices Capacity
Coverage is where MT8733 falls a tad behind Arris G34, as it failed to envelop my client’s 2,500 Sq Ft house completely. It left a few weak and dead spots in the nooks, taking its actual range at around 2,000 Sq Ft.
Nevertheless, the aforementioned technologies, OFDMA, MU-MIMO, and beamforming, made sure signals didn’t lose their strength and stayed stable over time. These technologies also boosted its device handling capacity, as 23-25 devices, including laptops, gaming consoles, and smart TVs, could stay connected at a time.
Ports & Connectivity
Aside from two telephone ports for internet-based calling, there are four Ethernet ports with Gigabit speed holding capabilities.
So, the bandwidth-hungry devices should feed through these and run without making any fuss. My Xbox 360 was plugged in, and with boosted download and upload speeds of 994 Mbps and 247 Mbps, I played RDR2 at 70fps for around six hours.
Security Features
Motorola MT8733 loses a couple of points in this department with not many free/advanced security features available for customers.
It entails a few handy features like VPN passthrough, WPA2, attack protection, and IP/MAC/port filtering, but lacks standard ones like firewall, guest access, and even advanced ones like malware protection.
Moving on, parental controls also stay on the same page with just a few basic features like WiFi pausing and tracking online time. If you seek advanced features, consider subscribing to third-party antivirus powered by Tenda Micro and Bitdefender.
Conclusion
With this modem router combo by Motorola, there’s a scope available for you to enjoy high-speed internet on your available devices without any lags. The speeds available with this device make it a holy grail for gamers, streamers, and workers.
It’s a tad more expensive than my previous recommendation but stays behind in coverage and ranks second. Want to learn more about it? Read the MT8733 full review.
- Two phone line support
- Easy to install
- Excellent throughput capacity
- Multiple Ethernet ports
- Not compatible with non-Xfinity voice services
6. Best Value for Money: ARRIS SURFboard SB8200
- Technology: DOCSIS 3.1
- Downstream/Upstream: 32 x 8
- Ports: 2 x Gig Ethernet
- Suitable Service Plan: Gigabit
- Modem-Router Combo: No
If you plan to get a top-notch modem replacement for Xfinity Gigabit (1000 Mbps) that cuts out the rentals, the ARRIS SURFboard SB8200 is one of the most appropriate options to invest in.
Compared to the SB6190 or other ARRIS modems that work with Xfinity, the SB8200 boasts better networking standards and higher throughput.
Why is it suited for Comcast Xfinity?
This standard for simultaneous channel usage supports multiplexed data transmission via the 2 x 2 OFDM. However, as a user, you can always rely on the more conventional DOCSIS 3.1 standard with 32 x 8 channel bonding support for getting hold of exceptional speeds in usual circumstances.
Upon testing the SB8200 with a Gigabit plan from Comcast, I could get wireless download and upload speeds of 942 Mbps and 37 Mbps, respectively. With these speeds in play, I could play games with low latency and stream them without lag.
There are two Gig Ethernet ports that allow pairing two wired connections into a better cumulative throughput, provided the ISP permits the same.
Moreover, it also supports Link Aggregation, which ensures speeds of up to 2 Gbps for the location-specific Xfinity Gigabit and Gig Pro plans.
Hardware & Other Features
Coming to the hardware setup, the processor is complemented by 3GB of RAM, which is instrumental in keeping the speeds and connections more consistent than usual. Assisting with the exceptional processing setup is the availability of DOCSIS 3.1 technology.
I am skeptical about modem performances and technologies, but the SB8200 puts every speculation to rest with a standard Broadcom chipset. So take a sigh of relief if you are wary of those defective Puma chipset-powered modems.
Besides, the Arris SurfBoard SB8200 is also compatible with Spectrum, Cox, Mediacom, WOW, Midco, and Sparklight. So if you plan to switch to a different ISP, you can do it without hassle.
Design and Build


It just weighs 1.52 pounds and measures 5 x 2 x 5 inches, giving it a rectangular form. I found it to be highly durable and well-constructed. The meshed side panel doesn’t heat up while streaming and gaming incessantly.
However, the four front-facing indicative LEDs, followed by the standalone coaxial port at the rear, adhere to conventionalism.
Conclusion
The Arris SB8200 is best for Xfinity Gigabit, owing to the optional DOCSIS 3.1 support and 2 x Gig Ethernet ports. Also, compared to other contenders on the list, including the MB8600 from Motorola, the SB8200 supports better speeds and exceptional 4K streaming.
Want to know more? Read my in-depth SB8200 review.
- Reliable hardware configuration
- Excellent cost vs value ratio
- Link aggregation support
- Handles 4K streaming
- No overheating
- Easy to set up
- Old design
7. Best for 800 Mbps: Netgear CM1100
Netgear CM1100 is priced more than most of the competitors and is capable of handling Gigabit Internet. However, I suggest my readers to use it for the Superfast 800 Mbps plan because it’s always a good idea to buy a device that comes with slightly higher capacities but is in the budget range.
- Technology: DOCSIS 3.1
- Downstream/Upstream: 32 x 8
- Ports: 2 x Gig Ethernet
- Suitable Service Plan: Superfast (800 Mbps)
- Modem/Router Combo: No
Would you be interested in a no-frills Netgear modem that is great at its job and doesn’t leave a hole in your pocket? Well, that is the CM1100 — which is a tad better when it comes to latency than the older CM1000. And if you seek highlights, this is one of the more future-proof modems in the picture.
Why is it suited for Comcast Xfinity?
First of all, the compatibility stands out— meaning you can use this networking device with any given Xfinity internet plan across regions (excluding the fiber connections). The device also features DOCSIS 3.1 networking technology with backward compatibility.
There are 32 x 8 downstream and upstream channels in play, allowing you to reach maximum download and upload speeds of up to 900 Mbps and 50 Mbps, respectively (wired connections only). And helping you achieve that are two Gig ethernet speeds that connect quickly and easily to gaming consoles and streaming devices.
As far as real-time speeds are concerned, upon testing it with the Gigabit plan, and could churn out 952 Mbps in download and over 32 Mbps in upload. Since I got such high speeds in the Gigabit plan it’ll perform much better on the 800 Mbps connection.
Design and Build


The Netgear CM1100 comes in black, features a rugged structure with an adequate number of vents, and even has a basal stand to keep the balance intact. There are 6 LEDs on the front panel, followed by the back-facing cable and power ports. And yes, the two ethernet ports do make sense.
Aesthetically, the networking device looks pretty basic. The plastic-clad layout measures 10 x 5 x 7 inches, with the weight being recorded as 1 pound precisely.
Hardware & Other Features
The ARM-based chipset deserves mention, as it works closely with 256MB of RAM and manages to keep gaming latency and ping to a minimum. As for the overall performance, the CM1100 boasts 2 x 2 OFDM/OFDMA compatibility— allowing you to access thicker data transmission channels.
The built-in QoS support prioritizes traffic to a whole new level, with or without the router. And to top it all off, you have link aggregation support to fall back on, allowing you to easily achieve multi-gig speeds.
Conclusion
To summarize, the Netgear CM1100 is a more easy-to-handle cable modem for Comcast that works well for high-quality streaming in a home or office environment. And its link-aggregation support is what separates it from the herd.
Read my review: Netgear CM1100 Review: Is It Worth Getting in 2023?
- Faster data transmission
- Top-notch wired connections
- Backward compatibility
- Heat-dissipating vents
- Link Aggregation support
- Easy to configure
- Basic design
- No router support
8. Best Budget Combo: ARRIS SURFboard G34
- DOCSIS Version: DOCSIS 3.1
- Wireless Standard: Wi-Fi 6 (802.11ax)
- Channel Bonding: 32 x 8
- WiFi Coverage: Up to 3,000 Sq Ft
- Suitable Plan: Gigabit (1 Gbps)
- Ports: 4 x Gig LAN
- Processor: Multi-Core
- RAM & NAND Memory: 512MB + N/A
- App Support: Yes
ARRIS G34 is undoubtedly the best modem router for a Gigabit plan from Xfinity. It comes with DOCSIS 3.1, Wi-Fi 6, and excellent near-band speeds. But unlike ARRIS G36 which I just reviewed, it misses out on a multi-gig port, which is why I suggest it for Gig internet.
Its maximum theoretical coverage of 3,000 Sq Ft. is the highest I have seen in any combo device. Besides, it replaces its predecessor with many upgrades in terms of throughput capacity, coverage, and overall performance.
Why is it suited for Xfinity?
Be it wired or wireless, ARRIS G34 bestows exceptional capabilities with the future-proof DOCSIS 3.1 and Wi-Fi 6 standards to boast aggregated speeds of 3000 Mbps. It’s distributed over the two bands as follows:
5 GHz: 2402 Mbps | 2.4 GHz: 574 Mbps |
With such high aggregated speeds, I paired an Xfinity 1 Gbps plan, and its performance was expectedly impressive. Over the 5 GHz band, the downloads unfold at 924 Mbps while uploads at 37 Mbps. At the same time, the faraway band recorded respective speed values at 521 Mbps and 24 Mbps.
Concerning networking technologies, G34 boasts a 2 x 2 OFDM/OFDMA support, making way for congestion-free data transmission. Speed values over a 30 feet distance, although showed a bit of dip (30%), the signals were stable and consistent. So, even at a distance, I could play Fortnite with my friends without being thrown out of the lobby due to a weak network.
WiFi Coverage & Devices Capacity
The performance of this device with respect to coverage is much better than any modem-router combos I have tested so far. Courtesy of its powerful antennas integrated with beamforming tech, signals could travel a maximum area of 2,500 Sq Ft. My client’s similarly spaced house was filled with powerful signals, including the corners.
Moving on, the OFDM support does wonders regarding device capacity. Rather than distributing a signal wave in all directions, it ensures all your devices receive signals of similar strength, enhancing its device handling ability. It could handle up to 25 devices at a stretch without producing any throttles or lags.
Ports & Connectivity
When it comes to combo devices, you can’t expect them to entail many ports. But, G33 makes an exception by including four of them on its rear panel, each supporting Gigabit speeds. Although they don’t support link aggregation, you can expect to get your downloads done at 989 Mbps while uploads at 301 Mbps.
So trust me on this, your gaming devices and smart TVs should run without any lags or latencies, with an added experience over wireless connections.
Security Features
Security is an area where the G34 has a middling performance. Right out of the box, its features include WPA2/WPA3 mix security standards and an SPI firewall that protects your network and client devices from unauthorized devices. But it lacks advanced protection from malware and malicious agents.
Regarding parental controls, it has only got features like WiFi pausing, scheduled access, and an internet dashboard for tracking online time.
Conclusion
Overall, ARRIS G34 is the best-rated router modem combo with some top-notch features, whether with respect to the modem or router. Its speeds and coverage are great, and networking technologies like OFDM make sure bandwidth-intensive tasks on multiple devices are hosted with ease. Check out its full review for more.
- Reliable hardware
- Excellent throughput and coverage
- Decent security features
- Excellent near-band speeds
- Distance speeds aren’t great
9. Best for Comcast Business: Hitron CODA56
- Technology: DOCSIS 3.1
- Downstream/Upstream: 32 x 8
- Ports: 2 Gig Ethernet
- Suitable Service Plan: Business Internet Gigabit Extra (1200 Mbps)
- Modem-Router Combo: No
Next on my list is another quality multi-gigabit capable modem, Hitron CODA56, which packs so many good things under its hood.
Certified to use with Comcast Business internet plans, it brings in much faster DOCSIS 3.1 tech, a multi-gig port, and a beefy processor for faster streaming, gaming, and video conferencing. It brings along a number of upgrades compared to the model it replaces, thereby, better performance.
Speeds & Performance
Hitron CODA56, with its advanced technologies, claims to support internet plans of up to 2.5 Gbps. But currently, the maximum speed is 1.5 Gbps, Hitron says it’s a hardware issue and not software.
Anyway, I used the Business Internet Gigabit Extra (1.2 Gbps) plan and the TP-Link Archer AX7E75 router to gauge its wireless speeds.
With the testing device 20 feet away, the test system managed a download speed of 1126 Mbps and an upload speed of 181 Mbps. Separating it by 40 feet dropped speeds to 761 Mbps and 107 Mbps, respectively.
Although speeds are good enough for any high-bandwidth tasks like video conferencing, streaming, and others, there isn’t any specialized technology for traffic management.
Design & Ports
CODA56 takes up a square profile with slightly round edges and is flat rather than vertical, as with most cable modems. It measures 9.76 x 9.41 x 4.21 inches and weighs 2.81 pounds, meaning the footprint is quite large.
But the top side is fully ventilated, which keeps the modem cool by dissipating most heat and, in turn, not disrupting the connection.
In the rear panel, there is a multi-gig port with a 2.5 Gbps speed capacity. Connecting my smart TV could yield up to a 38% refresh rate, with other devices taking up the bandwidth over a wireless connection.
Hardware Configuration
The manufacturer hasn’t revealed any information about what’s inside Hitron CODA56, but I can confirm that it’s indeed powerful. The device could easily soldier through most of my internet-bound tasks without producing a single lag or jitters in the connection.
Conclusion
To conclude, Hitron CODA56 does a great job of bringing a balance of features, performance, and cost. The speeds are good enough to undertake any business-oriented tasks and even others like gaming and streaming.
Powerful hardware ensures no lags, latencies, or jitters. But its limited compatibility with ISPs, bulky design, and delivery at fewer speeds than claimed has pushed it here.
- 2.5 Gbps port
- Excellent speeds
- Powerful hardware
- Easy to set up
- Limited ISP compatibility
10. Cheapest Option: Netgear CM500
Looking for an Xfinity-certified cable modem to use with 100 Mbps to 400 Mbps plans? Nothing can beat the Netgear CM500 in terms of features, price, and performance.
- Technology: DOCSIS 3.0
- Downstream/Upstream: 16 x 4
- Ports: 1 Gig Ethernet
- Suitable Service Plan: Fast (400 Mbps)
- Modem/Router Combo: No
For budget seekers, Netgear CM500 is a good enough budget modem for Comcast Xfinity. It offers better speeds than the older CM400, which could only support 100 Mbps internet plans.
Why is it suited for Comcast Xfinity?
Purchasing CM500 for a 400 Mbps plan makes sense, courtesy of the DOCSIS 3.0, 16 x 4 channel bonding, and backward compatibility with DOCSIS 2.0 hardware components. I tested the same with the Blast plan and could get wireless speeds of over 362 Mbps. The maximum upload speed was 22 Mbps.
Coming to the port arrangement, Netgear brings one Ethernet port into the mix, which is justifiable considering the price. And while it works well with Xfinity plans, you can also consider this for Cox and Spectrum internet plans.
Design and Build


The CM500 assumes a standard structure with well-positioned air vents to prevent overheating. You get 5 LEDs for getting the hang of the network status on the front, whereas the rear panel houses the cable input and the power port. The product weighs 0.62 pounds and measures 2.4 x 4.9 x 7.3 inches.
Hardware & Other Features
Broadcom BCM33843 chipset makes this device cut through interference with ease. There is 128MB of RAM to rely on, which helps you handle gaming latency like a pro.
Next in line is 8MB of NAND flash memory, perfectly capable of storing the firmware details on the device. Regarding additional features, the CM500 boasts QoS support for enhanced traffic prioritization.
Conclusion
In case you seek a cheap device to set up internet across a standard household or the home office, Netgear CM500 comes across as one of the better options around. Find more in my in-depth review of the Netgear CM500.
- Pocket-friendly
- Support for QoS
- Gig-level Ethernet port
- Multi-ISP compatibility
- Sleek form-factor
- Less ventilation
Complete List of Xfinity Compatible Modems [Officially Supported]
Comcast has an official list of 83 supported modems or modem/router combos. However, some of the mentioned devices come with bad chipsets, which have overheating and other performance issues.
Model Name | DOCSIS Technology | Channel Bonding | Suitable Plan | Modem/Router Combo | Voice Compatibility | Bad Chipset |
---|---|---|---|---|---|---|
Arris G34 | 3.1 | 32 × 8 | Super Fast (800 Mbps) | ✅ | ❌ | No |
Arris G36 | 3.1 | 32 × 8 | Gigabit Extra (1.2 Gbps) | ✅ | ❌ | No |
Arris S33 | 3.1 | 32 × 8 | Gigabit Extra (1.2 Gbps) | ❌ | ❌ | No |
Arris S33v2 | 3.1 | 32 × 8 | Super Fast (800 Mbps) | ❌ | ❌ | No |
Arris SB6183 | 3. 0 | 16 × 4 | Connect More (200 Mbps) & Lower | ❌ | ❌ | No |
Arris SB6190 | 3. 0 | 32 × 8 | Fast (400 Mbps) | ❌ | ❌ | Yes |
Arris SB8200 | 3.1 | 32 × 8 | Super Fast (800 Mbps) | ❌ | ❌ | No |
Arris SB8200v2 | 3.1 | 32 × 8 | Super Fast (800 Mbps) | ❌ | ❌ | No |
Arris SBG10 | 3. 0 | 16 × 4 | Connect More (200 Mbps) & Lower | ✅ | ❌ | Yes |
Arris SBG6950AC2 | 3. 0 | 16 × 4 | Fast (400 Mbps) | ✅ | ❌ | Yes |
Arris SBG7400AC2 | 3. 0 | 24 × 8 | Fast (400 Mbps) | ✅ | ❌ | Yes |
Arris SBG7600AC2 | 3. 0 | 32 × 8 | Fast (400 Mbps) | ✅ | ❌ | Yes |
Arris SBG8300 | 3.1 | 32 × 8 | Super Fast (800 Mbps) | ✅ | ❌ | Yes |
Arris SBV2402 | 3. 0 | 24 × 8 | Super Fast (800 Mbps) | ✅ | ✅ | Yes |
Arris SBV3202 | 3. 0 | 32 × 8 | Super Fast (800 Mbps) | ✅ | ✅ | Yes |
Arris SVG2482AC | 3. 0 | 24 × 8 | Super Fast (800 Mbps) | ✅ | ✅ | No |
Arris T25 | 3.1 | 32 × 8 | Super Fast (800 Mbps) | ❌ | ✅ | Yes |
Arris TM822G | 3. 0 | 8 × 4 | Connect More (200 Mbps) & Lower | ✅ | ✅ | No |
Arris TM822R | 3. 0 | 8 × 4 | Connect More (200 Mbps) & Lower | ❌ | ✅ | Yes |
ASUS CM-16 | 3. 0 | 16 × 4 | Connect More (200 Mbps) & Lower | ❌ | ❌ | No |
ASUS CM-32 | 3. 0 | 32 × 8 | Fast (400 Mbps) | ✅ | ❌ | Yes |
ASUS CMAX6000 | 3.1 | 32 × 8 | Gigabit (1 Gbps) | ✅ | ❌ | No |
D-Link DCM-301 | 3. 0 | 8 × 4 | Connect More (200 Mbps) & Lower | ❌ | ❌ | No |
Hitron CDA-CCC | 3. 0 | 4 × 4 | Connect More (200 Mbps) & Lower | ❌ | ❌ | No |
Hitron CODA | 3.1 | 32 × 8 | Gigabit (1 Gbps) | ✅ | ❌ | No |
Hitron CODA56 | 3.1 | 32 × 8 | Gigabit Extra (1.2 Gbps) | ❌ | ❌ | No |
HUMAX HGD310 | 3.1 | 32 × 8 | Gigabit (1 Gbps) | ❌ | ❌ | No |
Linksys CG7500 | 3. 0 | 24 × 8 | Fast (400 Mbps) | ✅ | ❌ | Yes |
Linksys CM3008 | 3. 0 | 8 × 4 | Connect More (200 Mbps) & Lower | ❌ | ❌ | No |
Linksys CM3016 | 3. 0 | 16 × 4 | Connect More (200 Mbps) & Lower | ❌ | ❌ | Yes |
Linksys CM3024 | 3. 0 | 24 × 8 | Fast (400 Mbps) | ❌ | ❌ | Yes |
Motorola B12 | 3.1 | 32 × 8 | Gigabit (1 Gbps) | ❌ | ❌ | No |
Motorola MB7420 | 3.1 | 16 × 4 | Connect More (200 Mbps) & Lower | ❌ | ❌ | No |
Motorola MB7621 | 3. 0 | 24 × 8 | Fast (400 Mbps) | ❌ | ❌ | No |
Motorola MB8600 | 3.1 | 32 × 8 | Gigabit (1 Gbps) | ❌ | ❌ | No |
Motorola MB8611 | 3.1 | 32 × 8 | Gigabit (1 Gbps) | ❌ | ❌ | No |
Motorola MG7315 | 3. 0 | 8 × 4 | Connect More (200 Mbps) & Lower | ✅ | ❌ | No |
Motorola MG7540 | 3. 0 | 16 × 4 | Connect More (200 Mbps) & Lower | ✅ | ❌ | No |
Motorola MG7550 | 3. 0 | 16 × 4 | Connect More (200 Mbps) & Lower | ✅ | ❌ | No |
Motorola MG7700 | 3. 0 | 24 × 8 | Fast (400 Mbps) | ✅ | ❌ | No |
Motorola MG8702 | 3.1 | 32 × 8 | Gigabit (1 Gbps) | ✅ | ❌ | No |
Motorola MG8725 | 3.1 | 32 × 8 | Gigabit (1 Gbps) | ✅ | ❌ | No |
Motorola MT7711 | 3. 0 | 24 × 8 | Fast (400 Mbps) | ✅ | ✅ | No |
Motorola MT8733 | 3.1 | 32 × 8 | Gigabit Extra (1.2 Gbps) | ✅ | ✅ | No |
NETGEAR C3700v2 | 3. 0 | 8 × 4 | Connect More (200 Mbps) & Lower | ✅ | ❌ | No |
NETGEAR C6220 | 3. 0 | 8 × 4 | Connect More (200 Mbps) & Lower | ✅ | ❌ | No |
NETGEAR C6230 | 3. 0 | 16 × 4 | Connect More (200 Mbps) & Lower | ✅ | ❌ | No |
NETGEAR C6250-100NAS | 3. 0 | 16 × 4 | Connect More (200 Mbps) & Lower | ✅ | ❌ | No |
NETGEAR C6300v2 | 3. 0 | 16 × 4 | Connect More (200 Mbps) & Lower | ✅ | ❌ | Yes |
NETGEAR C6900 | 3. 0 | 24 × 8 | Fast (400 Mbps) | ✅ | ❌ | No |
NETGEAR C7000v2 | 3. 0 | 24 × 8 | Fast (400 Mbps) | ✅ | ❌ | No |
NETGEAR C7100V | 3. 0 | 24 × 8 | Fast (400 Mbps) | ✅ | ✅ | No |
NETGEAR C7800 | 3.1 | 32 × 8 | Gigabit (1 Gbps) | ✅ | ❌ | No |
NETGEAR CM500 | 3. 0 | 16 × 4 | Connect More (200 Mbps) & Lower | ❌ | ❌ | No |
NETGEAR CM600 | 3. 0 | 24 × 8 | Fast (400 Mbps) | ❌ | ❌ | No |
NETGEAR CM700 | 3 | 32 × 8 | Fast (400 Mbps) | ❌ | ❌ | Yes |
NETGEAR CM1000v2 | 3.1 | 32 × 8 | Gigabit (1 Gbps) | ❌ | ❌ | No |
NETGEAR CM1000-1AZNAS | 3.1 | 32 × 8 | Super Fast (800 Mbps) | ❌ | ❌ | No |
NETGEAR CM1100 | 3.1 | 32 × 8 | Gigabit (1 Gbps) | ❌ | ❌ | No |
NETGEAR CM1150V | 3.1 | 32 × 8 | Gigabit (1 Gbps) | ❌ | ✅ | No |
NETGEAR CM1200 | 3.1 | 32 × 8 | Gigabit (1 Gbps) | ❌ | ❌ | No |
NETGEAR CM2000 | 3.1 | 32 × 8 | Gigabit (1 Gbps) | ❌ | ❌ | No |
NETGEAR CM2050V | 3.1 | 32 × 8 | Gigabit Extra (1.2 Gbps) | ❌ | ✅ | No |
NETGEAR CAX30S | 3.1 | 32 × 8 | Gigabit (1 Gbps) | ✅ | ❌ | No |
NETGEAR CAX80 | 3.1 | 32 × 8 | Gigabit (1 Gbps) | ✅ | ❌ | No |
NETGEAR CBR750 | 3.1 | 32 × 8 | Gigabit (1 Gbps) | ✅ | ❌ | No |
SMC Networks D3CM1604 | 3. 0 | 16 × 4 | Connect More (200 Mbps) & Lower | ❌ | ❌ | No |
TP-Link ARCHER CR500 | 3. 0 | 16 × 4 | Connect More (200 Mbps) & Lower | ✅ | ❌ | No |
TP-Link ARCHER CR700 | 3. 0 | 16 × 4 | Connect More (200 Mbps) & Lower | ✅ | ❌ | No |
TP-Link CR1900 | 3. 0 | 24 × 8 | Fast (400 Mbps) | ✅ | ❌ | No |
TP-Link TC-7610 | 3. 0 | 8 × 4 | Connect More (200 Mbps) & Lower | ❌ | ❌ | No |
TP-Link TC-7620 | 3. 0 | 16 × 4 | Connect More (200 Mbps) & Lower | ❌ | ❌ | No |
TP-Link TC7650 | 3. 0 | 24 × 8 | Fast (400 Mbps) | ❌ | ❌ | No |
TP-Link TC-W7960 | 3. 0 | 8 × 4 | Connect More (200 Mbps) & Lower | ✅ | ❌ | No |
Xfinity Modem Requirements
Internet Plans | DOCSIS version | Downstream channels | Upstream channels |
---|---|---|---|
300 Mbps and lower | 3.0 | 24 / 16 | 8 / 4 |
400 Mbps | 3.0 | 24 | 8 |
1.2 Gbps | 3.1 | 32 | 8 |
2 Gbps | 3.1 | 32 | 8 |
Did You Get a Modem? What’s Next?
Now that you’re done with a modem purchase, the next thing to do is set it up. If you’re a complete novice, the following guide will be helpful. Let’s go!
- Self-installing your Xfinity Modem
- Activating your modem.
- Returning your rented Xfinity gateway.
How To Self-Install Your Modem on Xfinity?
It’s easy. Here are a few basic steps to follow:
- Connect the coax cable to the modem and the power outlet, and turn on the switch.
- Wait for the modem’s indicator light to become stable. It can take 4-6 minutes and may take longer if the device updates its firmware.
- Finally, connect one end of the Ethernet cable to the modem and the other end to your computer or router. Your modem is now set up.
For more detailed steps & clarity, you may read my Xfinity self-installation guide.
Activate Your Modem with Xfinity
Activating your new modem on Xfinity shouldn’t be a strenuous task unless you live in a paleolithic age. Just install the Xfinity app, and follow a few simple steps as stated below:
- Launch the app and sign up on the app by providing a few details like the plan you’re subscribed to, name, password, etc.
- If you are already a primary user, sign in using the Xfinity ID and password.
- Once you’re logged in, start activation by selecting your device and clicking on the activate tab.
- Then, it will ask you to plug in the coax cable to the modem, and once it’s all powered up, the app will automatically check the connection.
- It will automatically be activated once the process is complete.
For more detailed steps, check out my Comcast modem activation guide.
Return the Rented-Xfinity Equipment
Like installation, returning Xfinity equipment is even simpler. Here are a few basic steps you must follow:
- Log in to the official Xfinity site and click on the “equipment return” tab.
- Tick off the products you want to return.
- Select the reason for returning and click confirm.
- Once confirmed, place the item in the original box.
- Paste a UPS prepaid on the box and hand over the shipment to the delivery person.
Things To Consider When Buying a Modem
Here are a few things to consider when picking a modem compatible with Xfinity:
- It must be Comcast compatible (it should be a device listed in their official Xfinity-supported modems list.)
- The modem should be capable of handling your internet plan. For instance, if you’ve subscribed to a 400 Mbps plan (Xfinity Blast!), then the modem should be capable of handling at least 600-700 Mbps.
- If you’re on a gigabit plan, you need a modem with DOCSIS 3.1 and 32 x 8 channel bonding.
- If you’re using Xfinity Voice, it must have a phone jack.
- If you’re living in a large house, avoid a modem-router combo; rather, go with a standalone modem + mesh WiFi system setup for seamless connectivity and WiFi coverage in the entire house.
- Decide whether you need performance or want to save cost. Standalone modem + router performs better than a modem-router combo but can get expensive depending on your chosen devices.
- If you’re getting a device to get rid of the monthly rental, then consider getting a basic modem + router or a modem-router combo that supports your internet plan.
- Know your requirements before choosing the right one.
Frequently Asked Questions
Yes, you can. Xfinity is a versatile service that allows you to use your own modem. But only a limited number of modems are compatible with the internet service, so check that out before making a purchase.
Xfinity supports modems with DOCSIS 3.0 and 3.1 technologies. Depending on your subscription internet plan, you can choose a suitable modem. For Gig internet, choosing a device with DOCSIS 3.1, 32 x 8 channel bonding, and a good hardware setup is best.
Here are the few steps you must follow:
– Plug out your Xfinity rented modem
– Once you’ve purchased a modem and plugged it in, you can use the Xfinity app to activate it.
– Connect your mobile or laptop to the modem and set up a network name and password
– Return your old modem
Usually, it takes 50-60 minutes to install the modem, provided you are not accustomed to the process. Besides, it would need 10-15 minutes to activate and start using the internet services on your devices.
You shall get a combo if you aim to save money on the rental and get good quality performance without spending a huge on the equipment. However, if you’re into gaming or live streaming, you should consider getting a standalone modem and a separate router.
The VoIP port on the modem converts the internet-specific voice service directly from the cable. The final signal syncs with the user’s telephone and supports voice-over IP. A basic telephonic connection over the cable internet service connects the VoIP modem to the telephone adapter as a part of a holistic unit.
Verdict
Finding a cable modem that best suits your Xfinity connection isn’t easy, as you need competitive solutions that are better than rentals. Plus, the device must sync well with your internet plan, as overspending isn’t always advisable unless you plan to upgrade.
Considering these, here is a curated list of handpicked modems for specific use cases:
- Motorola MB8611 is the fastest cable modem that works with Xfinity. Although it’s expensive, the features and performance it delivers get every penny of your investment worth.
- ARRIS G36 is a top-tier modem-router combo. The best part is its compatibility with other ISPs and the latest standards in both modem and router, that too at a reasonable price.
- If you’re interested in voice service, treat yourself with Netgear CM2050VMotorola MT8733.
- If you want a cheap yet dependable option, Netgear CM500 is your best bet. Its features aren’t on par with those high-end devices but stay well ahead of the ISP-provided xFi gateways.
With that, I’d wrap up my recommendations. Don’t forget to tell me which one you’ve gone for in the comments below!
I’m a Xfinity Gigabit Pro subscriber and have been using the Arris Surfboard SBG8300, I get speeds around 2000 Mbps without any trouble which used to be less than 1000 Mbps on rented modem.
The best part is, all of it happens without paying any monthly rental. I first used to think that renting a modem is better than owning it, but after paying it for 4 years, I now realize that it’s always worth purchasing a modem and a router.
Although, this came as an expensive device, but it’s powerful and allows me to get the full speeds according to the plans I’ve subscribed to.
Jacob,
Thanks for the commenting! I’m really glad that you’re having a pleasant experience using the Arris SurfBoard SBG8300. It is indeed a high-quality device that comes with everything one would require for setting up a fast internet connection. The best thing is, despite being a modem/router combo, it provides great performance!
I got a Netgear modem/router about 6 years ago. Was working fine till 2 weeks ago it wouldn’t lock a signal. Checked Xfinity site and it said my modem was not supported…🥺 well thanks. found a Netgear c6250-100NAS AC1600… Prime day deal of 89 bucks. Says compatible with Xfinity. Hoping it works. I want the new Netgear nighthawk with Wi-Fi 6 but don’t have 460 bucks at this time.
I’ve been using the Arris SBG8300, at the beginning I used to think that was highly overpriced, but considering the consistency, low-latency, it’s much better than the other modem/router combos I’ve used.
Although, it’s quite expensive, it’s highly future-proof and the best part about purchasing this is, I don’t have to purchase a separate router. Many people argue that a router/modem combo isn’t really powerful, but been using it for 3 months and there’s not a single problem.
Yeah, exactly, I’ve been using the same and the experience is quite smooth. One can’t argue that it’s quite expensive compared to other modems, but it’s a combo.
Those who don’t need a combo and don’t want to spend that much on a modem should consider getting the Arris Surfboard SB8200 (it’s the same modem, but you’ll need to purchase a router separately.)
In the end it’ll cost similar, but can save you a few bucks if you already have a decent wireless router.
I appreciate the continued posting and review of information.
I have a different metric: Can I “set it and forget it” for 10yrs with zero down time (and zero Comcast misguided remote interference aka “support”) if the surrounding power and thermal environment is configured well enough? For this metric, I have found that zero SURFboard modems survive/pass the test. Likewise, zero Motorola modems have proven they can last. In full disclosure, I manage only Comcast southeastern Michigan area businesses and commercial properties, with approximately 50 or so long term independent accounts (some can afford IT services, but most cannot as the economy has changed over the last 20yrs, and are “professional courtesy” accounts). For these clients, zero interruption with zero maintenance and zero Comcast-Interference is absolute. This limits them to 8×4 modems only, that are non-Motorola and non-SURFboard (as well as non-Intel) designs.
Hello, LastIndependence –
Thanks for advice. Which modems would you recommend?
Kurt, I really like the in-depth reviews and modems picked. To be honest, it does include a few bad modems too, however, they’re the only options for telephony/voice connections (I did blame you when I saw a PUMA 6 modem in this list, but then I did a research and found out that for telephony support that was the only available option.) After spending around 3-4 hours doing research, I must say that your list is one of the best unbiased resource for Xfinity owners. I really appreciate the efforts you’ve put in to publish it.
One question: Should I purchase a modem/router combo or get a separate modem and a router. I’ve heard from a few networking experts that combos don’t provide performance like the standalone units.
The Arris SB6190 is NOT a modem/router combo…the descriptive box here
says YES to that. It is a modem only.
This article showed up in my Google Discover a few weeks back. Earlier to reading this, I was paying huge monthly rental for an outdated equipment. However, I like the way how Kurt talked about ROI on renting vs buying, so I bought the Arris SB8200 from this list. Ever since that, my life seems to be sorted, I feel that the network at my place is lag-free (there’s no throttling) and I’m not paying the monthly rental. I however had to get a router to pair as the SB8200 is a standalone Xfinity certified modem.
Kurt, thanks for this great write-up. I currently have 200 mbps speed with the Xfinity modem and an planning to buy my own in the next week. I don’t foresee myself needing to upgrade internet speed in the foreseeable future. Would you still recommend the sb8200 for someone in my circumstance, or would I get identical performance from a cheaper model given my internet plan speed?
Interesting info, thanks Kurt. I want a standby modem (off line) that will replace my Arris 6190, which is still working fine but it is old. I’m on Xfinity Blast (400mbs) internet. I know the Arris SB8200 is 3.0 compatible , my question is; once on line and with Xfinity, will both Up/Stream and Down/Stream turn Blue for my service ? Or do I need to tell Xfinity it’s a 3.1 modem ?
I purchase motorola mt8733
xfinity/c0mcast provider
Significant packet losses
Download speed initially to my computer was 800-900mb/sec then dropped to less tha 300 mb/sec with significant packet losses
Have had 3 techs out checked the lines but can not fix the packet losses.
I suspect there is a filter somwhere ibn the line.
The ofdm channel seems to bew the problem s/n ratio
Any suggestions help appreciated
modem event log
Channel Lock Status Modulation Channel ID Freq. (MHz) Pwr (dBmV) SNR (dB) Corrected Uncorrected
1 Locked 256 QAM 5 549 12.1 42.2 2 0
2 Locked 256 QAM 2 531 11.1 41.9 0 0
3 Locked 256 QAM 3 537 11.5 42.0 0 0
4 Locked 256 QAM 4 543 12.1 42.3 0 0
5 Locked 256 QAM 6 555 12.3 42.2 0 0
6 Locked 256 QAM 7 561 12.2 42.3 1 0
7 Locked 256 QAM 8 567 12.3 42.1 0 0
8 Locked 256 QAM 9 573 11.7 42.0 0 0
9 Locked 256 QAM 10 579 11.2 41.7 0 0
10 Locked 256 QAM 11 585 11.6 41.8 0 0
11 Locked 256 QAM 12 591 11.5 41.9 0 0
12 Locked 256 QAM 13 597 11.9 42.2 0 0
13 Locked 256 QAM 14 603 11.7 42.1 0 0
14 Locked 256 QAM 15 609 11.7 42.0 0 0
15 Locked 256 QAM 16 615 12.0 42.0 0 0
16 Locked 256 QAM 17 621 11.8 42.1 0 0
17 Locked 256 QAM 18 627 11.4 41.8 0 0
18 Locked 256 QAM 19 633 11.4 41.8 0 0
19 Locked 256 QAM 20 639 11.5 42.0 0 0
20 Locked 256 QAM 21 645 11.8 41.9 0 0
21 Locked 256 QAM 22 651 11.8 41.9 0 0
22 Locked 256 QAM 23 657 11.2 41.8 0 0
23 Locked 256 QAM 24 663 11.3 41.9 1 0
24 Locked 256 QAM 25 669 11.0 41.8 1 0
25 Locked 256 QAM 26 675 10.6 41.4 1 0
26 Locked 256 QAM 27 681 10.5 41.7 0 0
27 Locked 256 QAM 28 687 10.2 41.6 0 0
28 Locked 256 QAM 29 693 10.4 41.6 0 0
29 Locked 256 QAM 30 699 11.0 41.7 0 0
30 Locked 256 QAM 31 705 10.3 41.6 0 0
31 Locked 256 QAM 32 711 10.3 41.6 0 0
32 Locked OFDM 37 762 8.6 40.4 13630655 0
18:43:54
Fri Apr 1 2022 Warning(5) Dynamic Range Window violation
Time Not Established Critical(3) SYNC Timing Synchronization failure – Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
18:46:59
Fri Apr 1 2022 Critical(3) No Ranging Response received – T3 time-out;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
18:46:59
Fri Apr 1 2022 Notice(6) Honoring MDD; IP provisioning mode = IPv6
18:47:00
Fri Apr 1 2022 Notice(6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Critical(3) SYNC Timing Synchronization failure – Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
14:21:15
Mon Apr 4 2022 Critical(3) No Ranging Response received – T3 time-out;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
14:21:15
Mon Apr 4 2022 Notice(6) Honoring MDD; IP provisioning mode = IPv6
14:21:16
Mon Apr 4 2022 Notice(6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
14:33:52
Mon Apr 4 2022 Critical(3) SYNC Timing Synchronization failure – Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
14:33:52
Mon Apr 4 2022 Critical(3) No Ranging Response received – T3 time-out;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
14:33:52
Mon Apr 4 2022 Notice(6) Honoring MDD; IP provisioning mode = IPv6
14:33:53
Mon Apr 4 2022 Notice(6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
10:23:24
Tue Apr 5 2022 Notice(6) CM-STATUS message sent. Event Type Code: 16; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 1 2 3.;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
10:23:52
Tue Apr 5 2022 Notice(6) CM-STATUS message sent. Event Type Code: 24; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 1 2 3.;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
07:41:43
Web Apr 6 2022 Critical(3) SYNC Timing Synchronization failure – Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
07:41:47
Web Apr 6 2022 Warning(5) MDD message timeout;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
07:41:48
Web Apr 6 2022 Critical(3) SYNC Timing Synchronization failure – Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
07:41:53
Web Apr 6 2022 Warning(5) MDD message timeout;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
07:41:54
Web Apr 6 2022 Critical(3) SYNC Timing Synchronization failure – Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
07:43:22
Web Apr 6 2022 Critical(3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received – T4 time out;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
07:43:23
Web Apr 6 2022 Critical(3) SYNC Timing Synchronization failure – Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
07:43:59
Web Apr 6 2022 Critical(3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received – T4 time out;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
07:44:00
Web Apr 6 2022 Critical(3) SYNC Timing Synchronization failure – Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
07:44:13
Web Apr 6 2022 Critical(3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received – T4 time out;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
07:44:13
Web Apr 6 2022 Critical(3) SYNC Timing Synchronization failure – Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
07:44:38
Web Apr 6 2022 Critical(3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received – T4 time out;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
07:44:38
Web Apr 6 2022 Critical(3) SYNC Timing Synchronization failure – Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
07:45:02
Web Apr 6 2022 Critical(3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received – T4 time out;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
07:45:09
Web Apr 6 2022 Critical(3) SYNC Timing Synchronization failure – Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
08:01:43
Web Apr 6 2022 Notice(6) Honoring MDD; IP provisioning mode = IPv6
08:01:53
Web Apr 6 2022 Notice(6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Critical(3) SYNC Timing Synchronization failure – Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
14:09:58
Web Apr 6 2022 Critical(3) No Ranging Response received – T3 time-out;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
14:09:58
Web Apr 6 2022 Notice(6) Honoring MDD; IP provisioning mode = IPv6
14:10:00
Web Apr 6 2022 Notice(6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
14:10:00
Web Apr 6 2022 Critical(3) SYNC Timing Synchronization failure – Loss of Sync;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
14:10:07
Web Apr 6 2022 Critical(3) No Ranging Response received – T3 time-out;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
14:10:51
Web Apr 6 2022 Warning(5) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
14:10:51
Web Apr 6 2022 Warning(5) Dynamic Range Window violation
motorola mt8733
xfinity /comcast
packet losses
Xfinity can not solve
Channel Lock Status Modulation Channel ID Freq. (MHz) Pwr (dBmV) SNR (dB) Corrected Uncorrected
1 Locked 256 QAM 5 549 12.1 42.2 2 0
2 Locked 256 QAM 2 531 11.1 41.9 0 0
3 Locked 256 QAM 3 537 11.5 42.0 0 0
4 Locked 256 QAM 4 543 12.1 42.3 0 0
5 Locked 256 QAM 6 555 12.3 42.2 0 0
6 Locked 256 QAM 7 561 12.2 42.3 1 0
7 Locked 256 QAM 8 567 12.3 42.1 0 0
8 Locked 256 QAM 9 573 11.7 42.0 0 0
9 Locked 256 QAM 10 579 11.2 41.7 0 0
10 Locked 256 QAM 11 585 11.6 41.8 0 0
11 Locked 256 QAM 12 591 11.5 41.9 0 0
12 Locked 256 QAM 13 597 11.9 42.2 0 0
13 Locked 256 QAM 14 603 11.7 42.1 0 0
14 Locked 256 QAM 15 609 11.7 42.0 0 0
15 Locked 256 QAM 16 615 12.0 42.0 0 0
16 Locked 256 QAM 17 621 11.8 42.1 0 0
17 Locked 256 QAM 18 627 11.4 41.8 0 0
18 Locked 256 QAM 19 633 11.4 41.8 0 0
19 Locked 256 QAM 20 639 11.5 42.0 0 0
20 Locked 256 QAM 21 645 11.8 41.9 0 0
21 Locked 256 QAM 22 651 11.8 41.9 0 0
22 Locked 256 QAM 23 657 11.2 41.8 0 0
23 Locked 256 QAM 24 663 11.3 41.9 1 0
24 Locked 256 QAM 25 669 11.0 41.8 1 0
25 Locked 256 QAM 26 675 10.6 41.4 1 0
26 Locked 256 QAM 27 681 10.5 41.7 0 0
27 Locked 256 QAM 28 687 10.2 41.6 0 0
28 Locked 256 QAM 29 693 10.4 41.6 0 0
29 Locked 256 QAM 30 699 11.0 41.7 0 0
30 Locked 256 QAM 31 705 10.3 41.6 0 0
31 Locked 256 QAM 32 711 10.3 41.6 0 0
32 Locked OFDM 37 762 8.6 40.4 13630655 0
18:43:54
Fri Apr 1 2022 Warning(5) Dynamic Range Window violation
Time Not Established Critical(3) SYNC Timing Synchronization failure – Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
18:46:59
Fri Apr 1 2022 Critical(3) No Ranging Response received – T3 time-out;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
18:46:59
Fri Apr 1 2022 Notice(6) Honoring MDD; IP provisioning mode = IPv6
18:47:00
Fri Apr 1 2022 Notice(6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Critical(3) SYNC Timing Synchronization failure – Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
14:21:15
Mon Apr 4 2022 Critical(3) No Ranging Response received – T3 time-out;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
14:21:15
Mon Apr 4 2022 Notice(6) Honoring MDD; IP provisioning mode = IPv6
14:21:16
Mon Apr 4 2022 Notice(6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
14:33:52
Mon Apr 4 2022 Critical(3) SYNC Timing Synchronization failure – Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
14:33:52
Mon Apr 4 2022 Critical(3) No Ranging Response received – T3 time-out;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
14:33:52
Mon Apr 4 2022 Notice(6) Honoring MDD; IP provisioning mode = IPv6
14:33:53
Mon Apr 4 2022 Notice(6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
10:23:24
Tue Apr 5 2022 Notice(6) CM-STATUS message sent. Event Type Code: 16; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 1 2 3.;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
10:23:52
Tue Apr 5 2022 Notice(6) CM-STATUS message sent. Event Type Code: 24; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 1 2 3.;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
07:41:43
Web Apr 6 2022 Critical(3) SYNC Timing Synchronization failure – Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
07:41:47
Web Apr 6 2022 Warning(5) MDD message timeout;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
07:41:48
Web Apr 6 2022 Critical(3) SYNC Timing Synchronization failure – Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
07:41:53
Web Apr 6 2022 Warning(5) MDD message timeout;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
07:41:54
Web Apr 6 2022 Critical(3) SYNC Timing Synchronization failure – Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
07:43:22
Web Apr 6 2022 Critical(3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received – T4 time out;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
07:43:23
Web Apr 6 2022 Critical(3) SYNC Timing Synchronization failure – Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
07:43:59
Web Apr 6 2022 Critical(3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received – T4 time out;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
07:44:00
Web Apr 6 2022 Critical(3) SYNC Timing Synchronization failure – Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
07:44:13
Web Apr 6 2022 Critical(3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received – T4 time out;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
07:44:13
Web Apr 6 2022 Critical(3) SYNC Timing Synchronization failure – Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
07:44:38
Web Apr 6 2022 Critical(3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received – T4 time out;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
07:44:38
Web Apr 6 2022 Critical(3) SYNC Timing Synchronization failure – Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
07:45:02
Web Apr 6 2022 Critical(3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received – T4 time out;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
07:45:09
Web Apr 6 2022 Critical(3) SYNC Timing Synchronization failure – Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
08:01:43
Web Apr 6 2022 Notice(6) Honoring MDD; IP provisioning mode = IPv6
08:01:53
Web Apr 6 2022 Notice(6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Critical(3) SYNC Timing Synchronization failure – Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
14:09:58
Web Apr 6 2022 Critical(3) No Ranging Response received – T3 time-out;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
14:09:58
Web Apr 6 2022 Notice(6) Honoring MDD; IP provisioning mode = IPv6
14:10:00
Web Apr 6 2022 Notice(6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
14:10:00
Web Apr 6 2022 Critical(3) SYNC Timing Synchronization failure – Loss of Sync;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
14:10:07
Web Apr 6 2022 Critical(3) No Ranging Response received – T3 time-out;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
14:10:51
Web Apr 6 2022 Warning(5) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=00:40:36:82:4e:80;CMTS-MAC=00:01:5c:67:e4:5d;CM-QOS=1.1;CM-VER=3.1;
14:10:51
Web Apr 6 2022 Warning(5) Dynamic Range Window violation