Comcast Compatible Modems DOCSIS 3.0 and 3.1

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With over 60 different Comcast compatible modems to choose from, how do you know which one is right for your service? Scroll to the table below for the master list, or view the modems we’ve selected as being the best value for each type of internet service Comcast provides.

I’ve been using Arris brand modems personally for many years, have setup friends with them, and have always had spectacular results. I’ve had to upgrade for faster speeds before they have died.

Comcast Internet Plans and The Best Modem To Get

Comcast Internet Only Plans – Please note these modems do not include phone lines or cable television.

Comcast Internet Plus 25Mbps: Arris SURFboard SB6121 ($50-60)

Comcast Internet Plus 100Mbps: Arris SURFboard SB6121 ($50-60)

Comcast Internet Plus 200Mbps: Arris SURFboard SB6141 ($68-85)

Comcast Performance Starters 10Mbps: Arris SURFboard SB6121 ($50-60)

Comcast Performance 25 25Mbps: Arris SURFboard SB6121 ($50-60)

Comcast Performance Pro 100Mbps: Arris SURFboard SB6121 ($50-60)

Comcast Blast! Pro 200Mbps: Arris SURFboard SB6141 ($68-85)

Comcast XI Gigabit Pro 2000Mbps: Arris TG862G ($199)  (Note: Called Comcast specifically to verify the best modem they recommend for this plan)

Comcast Compatible Modems DOCSIS 3.0 and 3.1 – July 2016

Vendor Model Product Name and Speeds Retail D3 IPv6 Cert.
Arris CM820A Touchstone Cable Modem – 343Mbps
Arris CM820A (Retail) Retail Touchstone Cable Modem – 343Mbps
Arris SB6120 (Retail) Retail SURFboard Cable Modem – 160Mbps
Arris SB6121 (Retail) Retail SURFboard Cable Modem – 172Mbps
Arris SB6141 (Retail) Retail SURFboard Cable Modem – 343Mbps
Arris SB6183 (Retail) Retail SURFboard Cable Modem – 686Mbps
Arris SB6190 (Retail) Retail SURFboard Cable Modem – 1.4Gbps
Arris SBG6400 (Retail) Retail SURFboard Cable Modem And Wireless Router – 343Mbps
Arris SBG6580 (Retail) Retail SURFboard Cable Modem And Wi-Fi Router – 343Mbps
Arris SBG6700-AC (Retail) Retail SURFboard Cable Modem And Wi-Fi Router – 343Mbps
Arris SBG6782-AC (Retail) Retail SURFboard eXtreme Cable Modem And Wi-Fi AC Router – 343Mbps
Arris SBG6900-AC (Retail) Retail SURFboard Wireless Cable Modem & Router – 686Mbps
Arris TG1682G RDK-B Telephony Wireless Gateway Modem TG1682G (XB3)
Arris TG862G Touchstone Telephony Wireless Gateway Modem TG862G
Arris TG862G (Retail) Retail Telephony Wireless Gateway(Same as TG862G-CT, T…
Arris TM722G Touchstone Telephony Modem
Arris TM722G (Retail) Retail Touchstone Telephony Modem
Arris TM804G Touchstone Telephony Modem TM804G
Arris TM822G Touchstone Telephony Modem TM822G
Belkin DPC3008 (Retail) Retail Belkin (formerly Cisco) Cable Modem
Cisco DPC3008 Cisco Cable Modem
Cisco ! DPC3939 Cisco Wireless Residential Voice Gateway (XB3)
Cisco DPC3939B Cisco Business Wireless Gateway (BWG)
Cisco DPC3941B Cisco Business Wireless Gateway (BWG)
Cisco DPC3941T Cisco MoCA DB-WiFi(3×3) Apps 2-port Voice Gateway
D-Link DCM-301 (HW Rev E1) … Retail DCM-301 DOCSIS 3.0 Cable Modem
HitronTechnologies CDA-CCC Cable Modem for Prepaid service ONLY
Linksys CM3008 (Retail) Retail Cable Modem
Linksys CM3024 (Retail) Retail Cable Modem
Netgear C3000-100NAS (Retail… Retail N300 Wireless Cable Modem Router
Netgear C3700-100NAS (Retail… Retail N600 Wireless Cable Modem Router
Netgear C6250-100NAS (Retail… Retail Wireless Cable Gateway
Netgear C6300 (Retail) Retail AC1750 Wireless Cable Modem Router
Netgear C7000-100NAS (Retail… Retail Wireless Cable Gateway
Netgear CG3000DCR Netgear Commercial Cable Modem Router
Netgear CG3000DV2 N450 (Reta… Retail N450 Wireless Cable Data Gateway
Netgear CM400 (Retail) Retail Cable Modem
Netgear CM500-100NAS (Retail… Retail Cable Modem
Netgear CM600 (Retail) Retail Cable Modem
Netgear CMD31T-100NAS (Retai… Retail Cable Modem
SMCNetworks D3CM1604 (Retail) Retail Cable Modem
SMCNetworks SMCD3G-CCR Cable Modem and Comcast Commercial Router
TP-LINK ARCHER CR700 (Retail… Retail AC1750 Wireless Dual Band Cable Modem Router
TP-LINK TC-7610 (Retail) Retail Cable Modem
TP-LINK TC-7620 (Retail) Retail Cable Modem
TP-LINK TC-W7960 (Retail) Retail Wireless-N Cable Modem Router
Technicolor TC8305C Wireless Cable Modem Gateway with Voice (XB2)
Technicolor TC8717C Wireless Cable Modem Gateway with Voice (XB3)
Zoom / Motorola MB7220 (Retail) Retail 8 X 4 Cable Modem
Zoom / Motorola MB7420 (Retail) Retail 16 X 4 Cable Modem
Zoom / Motorola MG7310 (Retail) Retail 8 X 4 Wireless Gateway-N300
Zoom / Motorola MG7315 (Retail) Retail 8 X 4 Wireless Gateway-N450
ZoomTelephonics 5341 (Retail) Retail Cable Modem
ZoomTelephonics 5341J (Retail) Retail Cable Modem
ZoomTelephonics 5345 (Retail) Retail Cable Modem
ZoomTelephonics 5350 (Retail) Retail Wireless-N Cable Modem Router
ZoomTelephonics 5352 (Retail) Retail Wireless-N Cable Modem Router
ZoomTelephonics 5354 (Retail) Retail Wireless-N Cable Modem Router
ZoomTelephonics 5360 (Retail) Retail Dual band Wireless Gateway
ZoomTelephonics 5363 (Retail) Retail Wireless-802.11AC Cable Modem Router
ZoomTelephonics 5370 (Retail) Retail Cable Modem

 One Star

A One Star designation indicates that the device has undergone DOCSIS testing by Comcast and has received the relevant Underwriters Laboratory (“UL”), Federal Communications Commission (FCC), and CableLabs certifications. Comcast’s DOCSIS certification supplements CableLabs testing by adding things like performance and interoperability tests. This helps to ensure that, for example, a given device can support a given service tier’s speed.

 Two Star

A Two Star designation indicates that the device has undergone all of the One Star tests as well as a basic Physical and Environmental (P&E) evaluation. Such basic P&E testing indicates basic manufacturer self-certification of a subset of P&E tests.That basic P&E evaluation is intended to address a number of important performance and safety issues, which tests from UL, the FCC, and CableLabs do not address. Some of the things P&E tests check for include areas such as device performance and safety during overheating, power interruptions (including power outs), radio frequency (RF) interference, electrostatic discharge, electrical surges, and network impairments.

 Three Star

A Three Star designation indicates that the device has undergone all of the Two Star and One Star tests as well as a full Physical and Environmental (P&E) evaluation. Such full &E testing indicates that all P&E tests were performed and that these tests were overseen in person. This is the highest and most thorough level of testing available.

Explanation of DOCSIS for Comcast Compatible Modems

There are three different levels of DOCSIS specifications:

  • 1.x
  • 2.x
  • 3.x

Each one tends to improve performance and/or offer additional features over the last.  This means that 3.x tends to be a better standard than 2.x, which in turn is generally better than 1.x.

DOCSIS 1.0

The original DOCSIS 1.0 standard offered support for a single channel, a trend that continued up until the introduction of the most recent DOCSIS standard, DOCSIS 3.0.  The official throughput for DOCSIS 1.x systems was limited to a usable 38 Mbps downstream and approximately 9 Mbps of upstream.  These rates are shared amongst multiple consumers in most cases, and are practical.  Some hosts provide higher specs, specifically 42.88 Mbps downstream and 10.24 Mbps upstream, but these fail to calculate network overhead and are not necessarily honest figures.

DOCSIS 2.0

As competition with DSL and other forms of broadband surged, a new standard was needed to deliver greater speeds to a greater number of consumers who were believed to be using upstream and/or downstream numbers as a guide to making purchasing decisions.  A standard that offered substantially higher bandwidth, and that standard became known as DOCSIS 2.0 and eventually DOCSIS 2.0 + IPv6.  DOCSIS 2.0 actually kept the already impressive downstream speeds, but tripled the upstream performance to 27 Mbps.  The logic behind this decision was simple: take a 100 customer region as an example.  How many of these consumers are downloading at full-speed at any given moment?  If individual download speeds are capped at 9 Mbps, then 4 could be using every last iota of network performance.  Of course, what are the chances that consumers or businesses could even find something that would tax 9 Mbps of downstream for any sustained duration?

It quickly became apparent that usage patterns pointed out that downstream speeds were already sufficient, but more customers could be serviced by increasing upstream speeds; the disparity between DOCSIS 1.x’s 38 Mbps downstream and 9 Mbps upstream was too great, but DOCSIS 2.x’s ratio of 38/27 Mbps was more desirable.  Of course, the advances made by DSL providers and fiber optics would eventually cause the birth of DOCSIS 3.0.

DOCSIS 3.0

What makes DOCSIS 3.0 different from its predecessors is that it is able to support multiple channels and bind them together to increase performance.  More channels means greater speed, and there is a 4-channel minimum requirement for DOCSIS 3.0 approved hardware.  Each channel offers a familiar 38 Mbps downstream and 27 Mbps upstream, but there are no limits to how many channels can be used.  This opens up a lot of performance possibilities, a great example of which is the 100 Mbps DOCSIS 3.x service available Comcast is offering business customers in selected areas.

DOCSIS 3.0 cable modems with 4 channel support is theoretically capable of downstreams greater than 100 Mbps, but it is only a matter of time until faster services are deployed that will be capable of utilizing more channels effectively.  Customers would do well to match the right DOCSIS 3.0 cable modem to the appropriate service, or risk paying for a broadband service that they are not fully capable of utilizing.

DOCSIS 3.1

First released in October 2013, and updated several times since, the DOCSIS 3.1 suite of specifications support capacities of at least 10 Gbit/s downstream and 1 Gbit/s upstream. DOCSIS 3.1 technology also includes some new energy management features that will help the cable industry reduce its energy usage, and the DOCSIS-PIE algorithm to reduce bufferbloat. In the United States, broadband provider Comcast announced in February 2016 that several cities within its footprint will have DOCSIS 3.1 availability before the end of 2016.


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