Cable modem for Comcast/Infinity
Kent Madsen
Kent Madsen kent....@gmail.com
Santa Cruz, California
Wayne
I have used several different modems and routers over the years and these are by far the best I've used. Connections are stable and they have worked flawlessly. They are also faster than any service than we're likely to ever have in our area, so they should be future-proof for some time to come. I believe that Fiber needs different modem, however.
Motorola MB8611 DOCSIS 3.1 Modem
https://www.amazon.com/MOTOROLA-MB8611-Ethernet-Approved-Comcast/dp/B08DDFKXKC
Asus RT-AX3000 Router
https://www.amazon.com/ASUS-RT-AX3000-802-11ax-Lifetime-Whole-Home/dp/B084BNH26P
> Santa Cruz, California
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Kent Madsen
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Kent Madsen kent....@gmail.com
Santa Cruz, California
Constantine Lackides
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Robert Michael
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Robert Lewis
Jeff Liebermann
Question for the group: For those of you who use your own modem & router for Comcast, do you have a favorite?
For myself and some customers, I prefer separate modem and router/wi-fi boxes. However, that becomes difficult (or impossible) if you also have Xfinity phone service. There is one model cable modem that has a built in phone modem (Arris TM822), but I don't recommend using it. So, you're stuck with either leasing or buying a "gateway" from Comcast, Circuit City, or online vendor.
There are also two types of cable modems. DOCSIS 3.0 and 3.1. Despite the similar numbers, the protocols and modems are radically different. Fortunately, a 3.1 modem will also work with 3.0, which is useful if you want to future proof the modem purchase. Basically, 3.0 works with anything up to about 1 gigabit/sec. Over that speed, you'll need 3.1. With 3.1, things are complicated if you want to use separate modem and router boxes. The router needs to have TWO bonded 1 Gbit ethernet ports or a single 2.5Gbit ethernet port. It doesn't make much sense to have a modem capable of 2Gbits/sec when the best your router can do is half that.
One thing that's important when selecting modems and gateways is
avoid the Intel Puma 6 and 7 chips.
https://approvedmodemlist.com/intel-puma-6-modem-list-chipset-defects/
https://lookgadgets.com/articles/intel-puma-modems-list/
Mostly, I've been using an Arris SB6183 for DOCSIS 3.0 and
whatever router/wi-fi box is available. The SB6183 will work up
to 373 Mbits/sec download. The data sheet says 686 Mbits/sec
download, but that includes overhead and perfect SNR (signal to
noise ratio). It's also quite cheap at $24 to $70. I have a few
refurbished modems in stock if you want to play.
https://www.newegg.com/p/pl?d=sb6183&Order=1
If you want to go faster, the Arris SB6190 will do about 700
Mbits/sec but claims 1.4 Mbits/sec. However, there's a problem.
Nobody knows for sure if the SB6190 has a Puma 6 chip or not. For
example, this lawsuit says it does:
https://www.classactionlawyers.com/puma6
while others say it doesn't and is therefore ok to use. I only
have one in service. The 2nd time the modem hung, the customer
called Xfinity support and they leased him a gateway. Sigh.
For Docsis 3.1 speeds, I have limited experience, none of which
is very good. I've been using Motorola SB8611 modems but at
Docsis 3.0 speeds. None of the people who bought these current
have 3.1 service from Xfinity (because they don't need to pay for
speed they're not using). When they do get 3.1, they will need to
change their router to something that works at 2.5 Gbits/sec
ethernet (instead of 1.0 Gbits/sec):
https://www.motorola.com/us/modems-routers
I have one customer with one of the Motorola Docsis 3.1 cable
routers. Of course, I can't recall which model. Here's where I
made a mistake. They bought a TP-Link Deco mesh something with 3
access points. The problem was that they preferred to use router
in the built TP-Link router instead of the router in the
Motorola. I don't recall the exact problem but the result was
that I had to use double NAT (network address translation) to make
this work. The only problem has been that Wi-Fi calling in their
various iPhones was not reliable and not intelligible. If you
want to do something complex with such a network, be prepared for
problems.
"List of approved devices for Xfinity" (login required)
https://www.xfinity.com/support/devices/
"Using Approved Third-Party Equipment for Xfinity Internet and
Xfinity Voice"
https://www.xfinity.com/support/articles/list-of-approved-cable-modems
(I'll bet you thought this was going to be simple).
-- Jeff Liebermann je...@cruzio.com PO Box 272 http://www.LearnByDestroying.com Ben Lomond CA 95005-0272 Skype: JeffLiebermann AE6KS 831-336-2558
TG
"Specific Comcast Business leased equipment is required for orders that include Internet-related services, like Comcast Business Security Edge™, or Business Voice, or if your modem is not compatible with our service."
"Before buying your own equipment, use my device info to easily check if your device is approved for Xfinity Internet and/or Voice service."
"You can purchase your own retail modem for use with your Xfinity Internet and/or Voice service, as long as the equipment is certified to work on our network."