Are you looking to replace the Xfinity modem supplied by the service provider? The good thing is there are many modems that are compatible with Xfinity by Comcast, but choosing the right modem or modem-router combo for your Internet plan and needs can be challenging.
You can’t pick a random modem and expect it to work flawlessly. Instead, go through various Comcast-compatible modems and find an ideal match based on your subscribed speed, requirements, etc. Besides compatibility, there are other factors that influence a purchase decision. For instance, if you’ve subscribed to a Gigabit plan, you’ll need a modem capable of handling Gig speeds.
And there are about 83 options in the official Xfinity-approved modems list. However, it also includes models with bad chipsets or ones that are not powerful enough to last a couple of years. That’s why I tested over 17 good models with suitable service packages and qualified the 7 best options.
Note: If you’re getting a standalone cable modem for Xfinity and not a modem-router combo, you’ll need to purchase a separate wireless router. You don’t need to check the compatibility of routers, as all of them are compatible. You can choose from:
- Best Comcast Xfinity Routers (suitable for small-to-medium households)
- Third-party Xfinity Mesh System (suitable for large households)
Contents
- 7 Best Modems for Xfinity [Compatible with Comcast] in 2023
- 1. Best For Xfinity Gigabit: ARRIS Surfboard S33
- 2. Best For 1000-1200 Mbps: Arris Surfboard SB8200
- 3. Best For Gaming: Motorola MB8600
- 4. Netgear modem for Xfinity: Netgear CM1100
- 5. Best Modem Router Combo: Motorola MG8702
- 6. Best Xfinity Voice & Data Modem: Netgear CM2050V
- 7. Best For Xfinity Blast: Netgear CM500
- Xfinity Approved Modems [Official List]
- Xfinity Cable Modem Buying Guide
- Frequently Asked Questions
- Verdict
7 Best Modems for Xfinity [Compatible with Comcast] in 2023
Based on 5 weeks of testing over 17 popular modems, here are my 7 best options:
- Best Overall: ARRIS Surfboard S33
- Best Gigabit Modem for Xfinity: Arris Surfboard SB8200
- Best for Gaming: Motorola MB8600
- Netgear Modem for Xfinity: Netgear CM1100
- Best Modem Router Combo: Motorola MG8702
- Best Telephony Modem: Netgear CM2050V
- Best Budget Option: Netgear CM500
Below, I’ve reviewed each of the above-featured devices. I’ve tested for diverse parameters such as speed, throughput, consistency, stability, plan support, etc. The list consists of high-end models at the top, followed by mid-range contenders, and affordable options at the end. Here we go:
1. Best For Xfinity Gigabit: ARRIS Surfboard S33
It doesn’t matter what your requirements are, if you’re looking for the best modem for Xfinity, then there’s nothing as good as the Arris Surfboard S33. It can handle the fastest Xfinity plan i.e. Xfinity Gigabit (1200 Mbps), without any issues.
- Technology: DOCSIS 3.1
- Downstream/Upstream: 32 x 8
- Ports: 1 Gig Ethernet + 1 2.5G
- Suitable Service Plan: Gigabit / Extreme Pro+
- Modem-Router: No
If you are into gaming, streaming, or setting up bandwidth-hungry IoT connections at home or office, you might consider the ARRIS Surfboard S33.
The S33 is a better upgrade over the below-mentioned SB8200, owing to the availability of a multi-gig port, making it #1 on this list.
Why is it suited for Comcast Xfinity?
Firstly, the Arris S33 works well with any internet plan from Xfinity by Comcast, but it makes sense to buy it for a 1200 Mbps service plan. I used it with the same internet package and was amazed by the speeds, throughput, and latency.
Being one of the best-rated DOCSIS 3.1 modems allows you to experience 2 x 2 OFDM channels for enhanced data transmission. Additionally, it works well with all backward-compatible devices without issues.
However, the standard internet plans use 32 x 8 channel bonding. Upon connecting this modem to a Wi-Fi 6 router, I experienced the highest wireless throughput of 1167 Mbps in download and 191 Mbps in upload in 5GHz mode.
Yet, if you use the Ethernet ports to establish direct connections (2.5G or the 1G) port, it 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 197 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 Surfboard 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, it makes sense to invest in the Arris S33. Its 2.5G port, higher throughput, and seamless internet experience make it the best cable modem for Xfinity internet.
- Fastest modem for Xfinity
- Ultrafast processor
- Multi-Gig port
- No overheating
- Latest networking specs
- Follows a new design pattern
- Expensive
- Overkill for basic plans
2. Best For 1000-1200 Mbps: Arris Surfboard SB8200
This modem can also handle Xfinity’s Gigabit plan, where you want download speeds between 1000-1200 Mbps. Also, The SB8200 is compatible with many other internet providers, including Spectrum, Cox, Sparklight, etc.
- Technology: DOCSIS 3.1
- Downstream/Upstream: 32 x 8
- Ports: 2 Gig Ethernet
- Suitable Service Plan: Gigabit
- Modem-Router Combo: No
If you plan to get a top-notch modem for Xfinity Gigabit that cut 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, especially if you are a loyal Xfinity Gigabit internet user.
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 Comcast Gigabit internet, I could get wireless download and upload speeds of 942 Mbps and 93 Mbps, respectively. As far as the performance is concerned, 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.
Besides, the 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.
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 a bit skeptical when modem performances and technologies are concerned, 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.
Design and Build
The Arris modem for Xfinity 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 undoubtedly the best cable modem 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 processing setup
- Link aggregation support
- Handles simultaneous 4K streaming
- Zero overheating
- Easy to configure
- It doesn’t support fiber plans
- Expensive
3. Best For Gaming: Motorola MB8600
If you’re a gamer then you need the lowest ping when playing online games or streaming your gameplay. One reason why the Motorola MB8600 excels over other top-of-the-line Comcast modems is — it comes with AQM (Active queue management), which allows it to prioritize traffic and make data transfers smooth!
- Technology: DOCSIS 3.1
- Downstream/Upstream: 32 x 8
- Ports: 1 Gig Ethernet
- Suitable Service Plan: Gigabit & Blast Pro+
- Modem-Router Combo: No
Motorola MB8600 has exceptional AQM (Active Queue Management) support, making it a reliable cable modem for gaming, streaming, and similar stuff.
You could also get Motorola MB8611, newer than the MB8600 but with higher speeds. However, many users still prefer the MB8600 as there are few differences or upgrades.
Why is it suited for Comcast Xfinity?
I ended up testing the MB8600 with Xfinity’s Gigabit and Blast! service plans, only to see it outperform every other contender in its price segment. Talking about numbers, when paired with the Gigabit plan, I could witness a download speed of 801 Mbps. And with the Blast plan, I was getting over 510 Mbps.
Upload speeds, on the other, were restricted to 50 Mbps, which is okay considering that DOCSIS 4.0 technology isn’t already here.
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. Plus, the AQM enhancement ensures better traffic prioritization. As far as actual, real-time performances are concerned, the MB8600 minimizes latency for online games.
Hardware & Other Features
Motorola persists with a basic ARM-specific Broadcom processor, which 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 the DOCSIS 3.1 standard.
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 and Build
This is a good-looking modem for Xfinity WiFi, which features a vertical structure. The dimensions read 7.25 x 7.88 x 2.25 inches. Also, it weighs close to 1.20 pounds, which is one the manageable end of things.
The aesthetics are pretty standard, with the MB8600 featuring several LED indicators for additional insights. Also, the upright design and darker color patterns ensure that the device syncs with any home décor arrangement.
Conclusion
I would recommend the Motorola MB8600 for the Xfinity 1200 Mbps service package. Compared to other devices on the list, I feel the gaming latency is much less on the MB8600, which also qualifies it as one of the best options for gaming.
You can also read my detailed review of the Motorola MB8600.
- DOCSIS 3.1 standard
- Ultra-fast Gig ethernet port
- Link Aggregation support
- Active Queue Management
- Built-in surge protection
- Only one Ethernet port
- A tad costly
4. Netgear modem for Xfinity: Netgear CM1100
- Technology: DOCSIS 3.1
- Downstream/Upstream: 32 x 8
- Ports: 2 Gig Ethernet
- Suitable Service Plan: Gigabit
- Modem/Router Combo: No
Would you be interested in a no-frills modem that is great at its job and doesn’t leave a hole in your pocket? Well, that is the Netgear CM1100 — which is a tad better when it comes to cutting through the gaming 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). As a standout Xfinity-approved modem, the CM1100 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 900Mbps and 50Mbps, 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, once you connect the device to a router, 500Mbps is something I could get. I tested it with the Gigabit and even the Blast! Internet plan from Xfinity. However, I still feel this is more of an Xfinity Gigabit modem meant for lag-free gaming and other bandwidth-intensive activities.
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 achieve multi-gig speeds with ease.
Conclusion
To summarize, the Netgear CM1100 is a more easy-to-handle cable modem for Comcast that works well for high-speed home or office connections. 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
5. Best Modem Router Combo: Motorola MG8702
In search of the best modem router combo for Xfinity? Well, look no further, as MG8702 from Motorola will win your heart! It offers commendable features in a 2-in-1 body. Learn more about it in the review below!
- Technology: DOCSIS 3.1
- Downstream/Upstream: 32 x 8
- Ports: 4 Gig Ethernet + 1 USB 3.0
- Suitable Service Plan: Gigabit
- Modem/Router Combo: Yes
If you ever plan on cutting the work short by investing in a modem router combo for Xfinity, then the Motorola MG8702 is a perfect option to rely on. It scales above the likes of Motorola MG7700 regarding max speed capping.
Why is it suited for Comcast Xfinity?
First of all, it is known for its ability to route the internet and modulate it. For starters, the DOCSIS 3.1 modem technology makes an appearance, boasting 32 x 8 channel bonding support and backward compatibility.
This future-proof device lets you work with Xfinity’s Gigabit internet. Four Gig ethernet ports are in play for setting up wired connections with link aggregation support. And that’s just the modem part of this device.
As a router, it supports Wi-Fi 5 technology with a cumulative networking throughput of 3200 Mbps. Therefore, you can use this device either for gaming, streaming, and even standard internet-intensive tasks, without having to rely on direct connections.
Design and Build
This vertically spanning combo device weighs 2.15 pounds, which is quite heavy compared to other router modems. Coming to aesthetics, the silver-black form factor looks great and measures 9.5 x 9.5 x 2.8 inches in terms of dimensions. Nine indicative LEDs are sitting on the front side, followed by 8 optional LEDs on the backside.
The build quality, despite being plastic, is top-notch. And there are adequate heat-dissipating vents to keep heat generation to a minimum. As for ports, there is a high-speed USB 3.0 slot in addition to those ethernet orifices.
Hardware & Other Features
The multi-core processor makes everything easy, especially with the 512MB of RAM helping it cut through the interference. What makes sense is the excellent OFDM support complementing this processor, so you won’t face issues like Xfinity slow internet. The routing element brings MU-MIMO technology into the mix, accounting for simultaneous internet connections.
Conclusion
To summarize, MG8702 is the best WiFi modem for Xfinity that works without hiccups. If you’ve any specific queries or want to learn more about this networking beast, you can read my dedicated review of the Motorola MG8702.
- Powerful hardware setup
- Great ventilated design
- A wide range of LEDs
- It also features a USB port
- Excellent Wi-Fi range
- Supports MU-MIMO, QoS, OFDMA
- High initial investment
- No Wi-Fi 6 support
- No link aggregation support
6. Best Xfinity Voice & Data Modem: Netgear CM2050V
There are quite a lot of modems with a phone jack, but I consider the Netgear CM2050V the best voice modem for Xfinity.
- Technology: DOCSIS 3.1
- Downstream/Upstream: 32 x 8
- Ports: 1 x 2.5 Gbps + 2 x Voice
- Suitable Service Plan: 1.2 Gbps + Voice
- Modem/Router Combo: No
If you’ve subscribed to the voice + internet bundle and are searching for a modem for Xfinity triple play, then Nighthawk CM2050V is a solid contender. Also, it is a huge upgrade from the CM1150V, courtesy of the new design, a multi-gig port, and efficient hardware setup.
Why is it suited for Comcast Xfinity?
The multi-gigabit modem features DOCSIS 3.1 technology and 32 x 8 channel bonding. On paper, it is known to support internet plans of up to 2500 Mbps. And in my test with the 1200 Mbps plan, I could get a maximum download speed of 1152 Mbps and an upload speed of 85-95 Mbps in close range.
As far as the ports are concerned, you get one 2.5Gbps ethernet slot to get you multi-gig speeds. Plus, there are two phone lines to help you work with the IP bundles offered by Xfinity, allowing you to connect the landline phone to the modem. 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 indicates 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 phone. 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 Netgear 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
7. Best For Xfinity Blast: Netgear CM500
- Technology: DOCSIS 3.0
- Downstream/Upstream: 16 x 4
- Ports: 1 Gig Ethernet
- Suitable Service Plan: Blast Pro+
- Modem/Router Combo: No
For budget seekers, Netgear CM500 comes forth as a good cable modem for Comcast Xfinity’s Blast! (400 Mbps) Internet plan. It manages to offer better speeds as compared to the older CM400, which could only support 100 Mbps internet plans.
Why is it suited for Comcast Xfinity?
Well, purchasing CM500 for the low-speed plans 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 (400 Mbps) and could get wireless speeds of over 360 Mbps. The maximum upload speed scored 25 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 as well.
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 modem for Xfinity 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
Xfinity Approved Modems [Official List]
| Model Name | DOCSIS Technology | Channel Bonding | Voice Compatibility |
|---|---|---|---|
| Arris G34 | 3.1 | 32 × 8 | ❌ |
| Arris G36 | 3.1 | 32 × 8 | ❌ |
| Arris S33 | 3.1 | 32 × 8 | ❌ |
| Arris S33v2 | 3.1 | 32 × 8 | ❌ |
| Arris SB6183 | 3.0 | 16 × 4 | ❌ |
| Arris SB6190 | 3.0 | 32 × 8 | ❌ |
| Arris SB8200 | 3.1 | 32 × 8 | ❌ |
| Arris SB8200v2 | 3.1 | 32 × 8 | ❌ |
| Arris SBG10 | 3.0 | 16 × 4 | ❌ |
| Arris SBG6950AC2 | 3.0 | 16 × 4 | ❌ |
| Arris SBG7400AC2 | 3.0 | 24 × 8 | ❌ |
| Arris SBG7600AC2 | 3.0 | 32 × 8 | ❌ |
| Arris SBG8300 | 3.1 | 32 × 8 | ❌ |
| Arris SBV2402 | 3.0 | 24 × 8 | ✅ |
| Arris SBV3202 | 3.0 | 32 × 8 | ✅ |
| Arris SVG2482AC | 3.0 | 24 × 8 | ✅ |
| Arris T25 | 3.1 | 32 × 8 | ✅ |
| Arris TM822G | 3.0 | 8 × 4 | ✅ |
| Arris TM822R | 3.0 | 8 × 4 | ✅ |
| ASUS CM-16 | 3.0 | 16 × 4 | ❌ |
| ASUS CM-32 | 3.0 | 32 × 8 | ❌ |
| ASUS CMAX6000 | 3.1 | 32 × 8 | ❌ |
| D-Link DCM-301 | 3.0 | 8 × 4 | ❌ |
| Hitron CDA-CCC | 3.0 | 4 × 4 | ❌ |
| Hitron CODA | 3.1 | 32 × 8 | ❌ |
| Hitron CODA56 | 3.1 | 32 × 8 | ❌ |
| HUMAX HGD310 | 3.1 | 32 × 8 | ❌ |
| Linksys CG7500 | 3.0 | 24 × 8 | ❌ |
| Linksys CM3008 | 3.0 | 8 × 4 | ❌ |
| Linksys CM3016 | 3.0 | 16 × 4 | ❌ |
| Linksys CM3024 | 3.0 | 24 × 8 | ❌ |
| Motorola B12 | 3.1 | 32 × 8 | ❌ |
| Motorola MB7420 | 3.1 | 16 × 4 | ❌ |
| Motorola MB7621 | 3.0 | 24 × 8 | ❌ |
| Motorola MB8600 | 3.1 | 32 × 8 | ❌ |
| Motorola MB8611 | 3.1 | 32 × 8 | ❌ |
| Motorola MG7315 | 3.0 | 8 × 4 | ❌ |
| Motorola MG7540 | 3.0 | 16 × 4 | ❌ |
| Motorola MG7550 | 3.0 | 16 × 4 | ❌ |
| Motorola MG7700 | 3.0 | 24 × 8 | ❌ |
| Motorola MG8702 | 3.1 | 32 × 8 | ❌ |
| Motorola MG8725 | 3.1 | 32 × 8 | ❌ |
| Motorola MT7711 | 3.0 | 24 × 8 | ✅ |
| Motorola MT8733 | 3.1 | 32 × 8 | ✅ |
| NETGEAR C3700v2 | 3.0 | 8 × 4 | ❌ |
| NETGEAR C6220 | 3.0 | 8 × 4 | ❌ |
| NETGEAR C6230 | 3.0 | 16 × 4 | ❌ |
| NETGEAR C6250-100NAS | 3.0 | 16 × 4 | ❌ |
| NETGEAR C6300v2 | 3.0 | 16 × 4 | ❌ |
| NETGEAR C6900 | 3.0 | 24 × 8 | ❌ |
| NETGEAR C7000v2 | 3.0 | 24 × 8 | ❌ |
| NETGEAR C7100V | 3.0 | 24 × 8 | ✅ |
| NETGEAR C7800 | 3.1 | 32 × 8 | ❌ |
| NETGEAR CM500 | 3.0 | 16 × 4 | ❌ |
| NETGEAR CM600 | 3.0 | 24 × 8 | ❌ |
| NETGEAR CM700 | 3.0 | 32 × 8 | ❌ |
| NETGEAR CM1000v2 | 3.1 | 32 × 8 | ❌ |
| NETGEAR CM1000-1AZNAS | 3.1 | 32 × 8 | ❌ |
| NETGEAR CM1100 | 3.1 | 32 × 8 | ❌ |
| NETGEAR CM1150V | 3.1 | 32 × 8 | ✅ |
| NETGEAR CM1200 | 3.1 | 32 × 8 | ❌ |
| NETGEAR CM2000 | 3.1 | 32 × 8 | ❌ |
| NETGEAR CM2050V | 3.1 | 32 × 8 | ✅ |
| NETGEAR CAX30S | 3.1 | 32 × 8 | ❌ |
| NETGEAR CAX80 | 3.1 | 32 × 8 | ❌ |
| NETGEAR CBR750 | 3.1 | 32 × 8 | ❌ |
| SMC Networks D3CM1604 | 3.0 | 16 × 4 | ❌ |
| TP-Link ARCHER CR500 | 3.0 | 16 × 4 | ❌ |
| TP-Link ARCHER CR700 | 3.0 | 16 × 4 | ❌ |
| TP-Link CR1900 | 3.0 | 24 × 8 | ❌ |
| TP-Link TC-7610 | 3.0 | 8 × 4 | ❌ |
| TP-Link TC-7620 | 3.0 | 16 × 4 | ❌ |
| TP-Link TC7650 | 3.0 | 24 × 8 | ❌ |
| TP-Link TC-W7960 | 3.0 | 8 × 4 | ❌ |
Xfinity Cable Modem Buying Guide
Here are a few things to consider when picking an Xfinity-supported modem:
- It must be compatible with Xfinity.
- 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, then you need a gigabit modem that comes 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.
The above-featured Xfinity modems are worth checking out. However, before you proceed, you must check out the following factors that might help you make informed decisions.
For your convenience, here are the Comcast Xfinity service plans (in a tabular format below) to keep in mind while selecting a modem.
| Plans | Maximum Download Speed | Price |
|---|---|---|
| Performance Starter+ | Up to 50 Mbps | $19.99/mo |
| Performance Select | Up to 100 Mbps | $34.99/mo |
| Performance Pro+ | Up to 200 Mbps | $49.99/mo |
| Blast Pro+ | Up to 400 Mbps | $64.99/mo |
| Extreme Pro+ | Up to 940 Mbps | $74.99/mo |
| Gigabit | Up to 1200 Mbps | $84.99/mo |
Your Requirements
Before you pick a modem compatible with Comcast, it is necessary to check out the usage patterns first. For instance, if you plan on setting up a primary household network, a standard modem with one Gig ethernet port and 32 x 8 channels might suffice. However, a combo device might be a good fit if you plan to prioritize coverage and wireless speeds.
You might want to consider modems with phone ports for office-based setups, allowing you to set up telephone connections over the internet. Depending on the usage, you can select Xfinity’s 300Mbps, 600Mbps, 900Mbps, or the Gig plan — and also get a device that is in line with those speed offerings.
Speeds & Throughput
As mentioned, you can select plans as per your preferences. However, you can consider getting modems with more than one ethernet port to maximize the throughput. Plus, to better the performance, it is advisable to check for devices with built-in QoS support.
If you want to get a modem router combo, a Wi-Fi AC standard with cumulative speeds of over 3000 Mbps might make sense. And if you have plans to use multiple smart devices at home, the combo should also have MU-MIMO functionality.
Hardware & Design
Most modems supported by Comcast feature Broadcom chipsets and at least 128MB of RAM to manage every network commitment in plain sight. However, if you want a device for gaming and 4K streaming, it is advisable to pick a device with 512MB of RAM.
Coming to the design, it is important to check for air vents for heat dissipation, mainly if you belong to temperate zones. Also, it is necessary to check if the device has an adequate number of LED indicators.
Frequently Asked Questions
Any modem with DOCSIS 3.0 standard and at least 128MB of RAM is good enough for handling diverse Xfinity internet plans. While the final selection varies depending on the Gigabit, Extreme Pro, Performance, Blast, and other internet packages, it is necessary to get the minimum configuration, including the processing setup and at least 8×4 channel bonding support.
If you are planning to go with the Gigabit plan and upgrade to multi-gig connections in the future, if and when Xfinity comes up with the same, DOCSIS 3.1 is a crucial future-proof consideration. While DOCSIS 3.0 with 32×8 channels is more than adequate for most modern-day internet plans, the DOCSIS 3.1 2×2 support ensures better throughput and speeds even when congested.
The VoIP port on the concerned device converts the internet-specific voice service directly from the cable. The final signal is in sync with the user’s telephone and supports voice-over IP as one of the few select services offered by Comcast Xfinity. A basic telephonic connection over the cable internet service connects the VoIP modem to the telephone adapter as a part of a holistic unit.
If you aim to save money on the rental and get good quality performance without spending a huge amount on the equipment, you shall get a combo. However, if you’re on a high-speed plan and want one that performs well, you shall consider getting a standalone modem and router.
Verdict
Finding the top modem for Xfinity isn’t easy, as you need competitive solutions that come across as better bets than rentals. Plus, you need modems and combos that sync with the existing internet plan, as overachieving isn’t always advisable unless you plan to upgrade.
Considering these factors, here are some curated and handpicked solutions as per specific use cases:
- Get Motorola MB8600 if you are invested in gaming, streaming, or other similar tasks. It’s one of the fastest modems available in the market today.
- For internet and VoIP plans, Netgear CM2050V is a better bet, courtesy of two phone jacks. Establish high-quality VoIP connections!
- If you don’t want the hassle of handling the modem and router separately, the Motorola MG8702 is a great combo device to invest in.
- Lastly, Netgear CM500 should be the go-to solution if you are interested in mid-range plans and affordability.
Apart from these selections, the other networking resources can easily handle multiple internet and voice plans. However, the final decision depends on the preferences, tasks, and internet plan you are willing to get.
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