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The Spectrum Mystery Modem E31_2V1

Back Story:

I use Spectrum Cable with a 300 Mbps download plan for my Internet. It is the fastest I can get in my area, and for the last couple of years, it has worked flawlessly. Recently, that wonderful euphoric digital state ended rather abruptly. My network would not stay connected. It went from “bad” (disconnecting from the Internet a half dozen times or so a day) to “horrible” (disconnecting over 30 times in one afternoon). After each disconnect, my Ubee modem/router combo would restart, then my hardware firewall would restart, then some or all of my iOT’s wold fail to reconnect to the wifi portion of the router (and then be nudged by me manually to get them back on the network, or to my wifi extender). Also, I have VOIP, so my phones went down every time there was an internet disconnect, only to return online after the routers, modem, and hardware firewall came back to life.

I will say that Spectrum did a good job in resolving the connection issue (that turned out to be a bad cable connector located on a telephone pole behind my property). They started with the most obvious problematic source, replacing my old Ubee combo router/modem, with a new and separate router and modem. When the installer connected these two components, I noticed the new router and modem were simply branded “Spectrum”. After the components were installed, I got into the router and configured it. It had a lot of the “right” configuration options, and I felt fairly comfortable that it was at least an “OK” router. For the modem, there was no access point, and I really could not tell anything about it. I decided to leave well enough alone and let both the components be for awhile.

After several months past, though everything on my network again returned to the aforementioned euphoric digital state, I could not get a comfortable feeling about the modem. I decided to do some digging. I found a model number on its back (E31T2V1). I could not find much on the Internet, and that is because there isn’t much. That being said, there might be enough to get a feel about what the Spectrum E31T2V1 cable modem is all about. What follows is a summary of what I found.

Four Brands For One Modem: E31_2V1

In order to get the specs for the modem, I needed to figure out who actually made the thing. The Spectrum E31T2V1 cable modem seems to have been made by Hitron (the linage is still a little vague). Under the Hitron label, its model number is E31N2V1. Ubee has also labeled this modem as a E31U2V1. Then, Techicolor also sells this modem, with a model number of E31T2V1, – the very same model number as the Spectrum branded modem.

So basically, we have Hitron making a modem that Spectrum, Hitron, Ubee, and Technicolor all sell and/or distribute, and it is the very same modem, right? Well………, maybe. It seems some, if not all of the Hitron and Ubee modems have the dreaded and maligned Intel Puma 6 or 7 chipsets. The E31T2V1 versions of Spectrum and Technicolor use the more favored Broadcom chipsets. Beyond this point, I have not been able to distinguish any differences between the various vendors and model numbers.


All the E31_2V1 cable modems have DOCSIS 3.1 and are backward compatible to DOCSIS 3.0. For most of you knowing this will not increase your heart rate one beat. This may change when you find out what DOCSIS 3.1 is:

DOCSIS is a technology developed by CableLabs for transfer of data over coaxial cable that are developed and used for cable TV connection. Cable Operators across the world have adopted DOCSIS standards for providing Internet data, voice, and video services using existing cable TV systems(1).

So why would you want DOCSIS 3.1 over DOCSIS 3.0? For starters:

DOCSIS 3.1 has a maximum downstream speed of 10 Gbps (3.0 is 1 Gbps). DOCSIS 3.1 has a maximum upstream speed of 1 Gbps (3.0 is 200 Mbps). DOCSIS 3.1 features significantly higher speeds than DOCSIS 3.0. DOCSIS 3.1 also uses data spectrums more efficiently, increasing the amount of data that can be sent over your network(2)

In summary, DOCSIS 3.1 is a good thing. A good thing where up until recently it was only found in the “expensive” cable modems. DOCSIS 3.1 is found in all the E31_2V1 models of this modem.

To get all the specs on the E31_2V1, click HERE (Spoiler Alert: They are impressive)

How Good Is The E31_2V1?

My modem is an E31T2V1, with the Broadcom chipset. I was nearly ready to shelve this modem and go after an Arris Surfboard. After finding more about the modem’s specs, I am glad I didn’t. I have a 300 Mbps download plan, and am consistently getting speeds in the 340–350 Mbps range. Also, the E31T2V1 has not had any problems. It has been reliable.

This modem with many names and model numbers has earned its place in my network.


(1) What is DOCSIS 3.1 and why should I use DOCSIS 3.1 technology? |–is–DOCSIS–3–1–and–why–should–I–use–DOCSIS–3–1–technology


By prometheus

Husband. Father. Grandfather. World class Geek.

54 replies on “The Spectrum Mystery Modem E31_2V1”

This is from the Specs sheet: “DTMF Tone Detection,T.38FaxRelay(G.711),Echo Cancellation(G.168)/Silence Suppression,Voice Active Detection and Comfort Noise Generation”

Does this mean there is an active microphone in the e31t2v1 modem?


My E31_2v1 is from Spectrum and does not have an active microphone. The spec sheet you are referring to is from Charter Communications, and according to the spec sheet, their version of this modem does have an active microphone.


This is incorrect. What these specs are referring to is the VOIP service. These features work to eliminate background noise and cancel out any echo feedback you would hear from your voip phone’s microphone.


You are correct. The specs for the version I linked to are for the VOIP service. However, I do remember that one version (or rather variant) does have a microphone.

Thanks for the catch.


i am not as tech savy as you, my question is simple: is it possible to connect to-link wireless router to the ‘spectrum’ e21t2v1? there is no port for the ethernet cable?????

Larry I have the Spectrum Modem you describe. It seems to work fine. How to you get into the modem to see the setup screen. I did the greater than 10 sec reset. I used a laptop on the WAN set to static I can ping or but can’t see the login screen for the modem on either xx.100.1 or 0.1. I did see a Cisco login screen one time but that was all. I had no issue on the Docsis 3.0 Arris using


I have not been able to get the modem to generate a setup screen. I tried to find a source to accomplish this, but after a lot of research, came up empty-handed. Fortunately, the modem’s default settings met the needs of my network. If you find a source that works, please let me know.



Thanks Larry. Inquiring minds just like not to be restricted on info but they got us on this one.
The DOCS3.1 works fine. I really don’t see much improvement in the change. Maybe the ping is
Slightly lower. I use PingPlotter to monitor the internet. It will show the start/stop on outages
As well as packet loss. I had a 20 min outage one day and then lots of packet loss for 12-15 hours
Before I called Spectrum. The CSR could not log into my new modem either. She had the new MAC.
I rebooted the modem per her request and bingo the packet loss went to zero. So be aware of this.

Johnny S

I recently upgraded my Spectrum broadband service to their 1GB plan.  This required replacing the cable modem and router with a Spectrum E31T2V1 cable modem and a Spectrum SAC2V1K router.  

I am able to log-in to my SAC2V1K router using but unlike previous routers, Spectrum offers no customization tools and this seems to be by design based on my Google search results.

But the real reason I’m here is because I suspect my broadband connection is dropping intermittently and I’m looking for a network monitoring tool that I can use to confirm this suspicion and provide to Spectrum tech support.  My company’s old VPN, AT&T Global Network, would pop-up when the connection was lost so I was always aware of when/if it happened.  However, we are now using Cisco AnyConnect and it is transparent in the connection drops.  I can export a text log but it isn’t clear what is happening.  

Can anyone recommend a free or fee-based solution for a non-techie that is easy to use? I thought CNET’s recommendation of might help but it lacks activity/connection logs by design.


Looks like a similar issue with the E31_V21, as the SAC2ViK is labeled as Sagemcom, Askey, and Commscope. Certainly not much usable in available. As for your other issue for software to monitor for dropped broadband connections, I cannot think of a solution. For me, I have a Bitdefender hardware firewall/router for wifi, and when it loses its connection to Bitdenders’ servers, a red light circles very noticeably on the front of its case, signaling wifi is dead.

Hopefully one of our readers can offer a better solution.


Continuous internet speed test tool –
I have been using this on Spectrum. Put it on a stand alone PC with only this pgm running. It amazing what is going on with speed. Not lost packets but SPEED. I also use Ping Plotter but STC shows realtime continuous. Wish I had another service to compare this to but this is it for me. at&t 50mb on copper is not for me. Their fiber is not in my neighborhood yet. I still have T-Mobile’s TVision for IP TV.
Johnny S.

We have about 50 users working at home, and have VOIP softphone issues. If they use their mobile hot spot instead of wifi no issues. Would SIP ALG be enabled on these modem? Since it is not a router I would almost think its not possible, but not sure what else is causing all these users SIP VOIP devices to either not register, or have 1 or two way audio. But eliminating the Spectrum modem allows calls to work fine.


Unfortunately, I don’t have enough experience with your problem to provide you with a solid answer. You might find a result with Spectrum’s commercial services for business customers. SIP ALG in most cases should be “off”. Access to Spectrum modems seems limited, and Spectrum themselves may only be able to answer the SIP ALG enable/disable issue. That being said, if you unplug the modem and the phones work fine, it pretty much points to the modem being the problem.

Wish I could be more help.



If you can find out the Spectrum’s DNS server’s IP address, it should work. You can check with Comcast’s approved modem list to verify if the Spectrum will work. Comcast should already have instructions on how to use non-Comcast modems with their system.

Hope this helps.


Quick question, I was about to purchase this Spectrum E31U2V1, will it work with my medicom cable internet 200 Meg service? Doe is also broadcast the wifi for us to connect to? I wanted to get a device that is modem and wifi in one. Thanks – TW

Hello, on Monday I upgraded my spectrum internet to the 1gig service they used the Ubee version of the E31U2V1 Modem. Since installed I am yet to receive any speeds higher than 500mbps and that was wireless on my iphone. (my laptop wired hit about 350mpbs). After several calls and visits by Spectrum Techs they are assuring me that 1gig speeds are coming through the modem based on the speed tests done using their own equipment. They also checked all the lines and outlets to make sure there was not a wiring issue.In addition to not receiving close to the 1gig speeds i am now dealing with constant packet loss and connection drops. This morning a tech came again and switched my modem out for the exact same one. Unfortunately it did not solve my issue. Do you think this issue might be solved by going with the E31T2V1 Technicolor modem instead because of the Broadcom Chipset? Thank you.


There are a lot of variables here, and a lot about your setup that I do not know about, so I may be swinging in the dark. Here are 4 things you might try: (1)If I understand, speed tests both “to” and “from” the modem provide 1gig speeds. Were speeds taken from an ether-net port directly from the router? If you are not getting 1gig here then there are setting issues with the router itself, or maybe the router doesn’t support 1gig transfer. I would verify the router settings. (2)Let’s assume the signal for wired connections leaving the router are 1gig. Verify that the ether-net cable you are using is cat 5e or higher, and that all switches/hubs are rated a 1gig transfer. Next, make sure your devices’ ether-net ports are 1gig compatible. (3)For 1gig wireless connections, your router must send a WiFi signal with the 5G band using the Wifi standard 8.11ac. As a radio signal, 2G will provide greater distance. There are areas in my house when a device can function effortlessly on 2G, where the same device on 5G drops signals and looses packets. So, theoretically, if you are in the same room with your router (and the router receiving 1gig from the modem), with both router and your device configured to use the 8.11ac standard and 5G, you should be getting a transfer speed somewhere in the vicinity of 1gig. (4)As I said earlier, there are more variables in play here, but after doing some or all of the above, and there is no joy, I would get to Spectrum and have a Spectrum Tech Supervisor come to your home and further diagnose and solve your problem. I have done this myself. I had techs to my house three different times for the same issue, each time without an acceptable result. A Supervisor came out, listened to my problem, and solved my issue in less than 5 minutes.

Hope this helps.


I see that an external battery can be plugged in to this unit but I can’t find anywhere info on what battery pack would fit it. Has anyone else seen more on this? I don’t like the idea of being at the mercy of the power company for communications to work.

We are having problems with always losing connection. Spectrum says it’s netgear and netgear says it’s spectrum. Went today to buy a new modem and they still can’t get a good signal on it. The fourth visit from spectrum tomorrow.

Have you had problems keeping connections?


I had a similar problem with Spectrum. My site was disconnecting as well. I had several visits with a Tech, and no positive results. New router, new modem, changed connectors on the house……, and no joy. Finally, I had enough. In one afternoon, between 12:00 and 4:00, while I was attempting to work on a project on my computer, Spectrum disconnected something like 32 times!!! I called and asked for a Supervisor to come out. Upon arrival, he asked if any of his techs had checked to connection from the telephone pole behind my house to the connection at my house. I said no. He went to check it. After climbing a ladder and going “up the pole”, he brought back a piece of cable and the connector. The cable’s insulation, next to the connector was gone. A tree limb had been rubbing against the cable and had actually worn thru to the bare wires. He snipped out the bad piece, added a new connector to the existing cable. No problems since.

This may or may not be your specific problem. However, getting someone higher up the chain-of-command may bring you better results, it did for me.



Amazing how many times people fail to look for the simplest problem. The obvious isn’t always so obvious. thank you for this information source. My Spectrum modem is the E31U2V1. Not sure if it’s just the same as you identify but it looks the same. I cannot find any way to log in to see settings, either.

Hi Jeff,

I believe the “U” in your modem’s model number is for Ubee. It is the same series of modem as found in my article. As far as being able to log into the modem, I am no help, as I have not been able to log into it either. Hopefully, one of our readers can give us a hand with this. Just thought of this….possibility of using the modem’s mac address to find the modem’s IP address. You can get the IP address from, among other places, your router. Pop that into your browser, and see if you can get a login screen (I’ll try the same on my end).



Just got the Spectrum version of this modem today. Felt weird that it was Spectrum branded, but on activation, the brand was listed as Ubee. Thanks for looking into this, I was worried I might have to go modem hunting if this unit turned out to be garbage. Cheers.


My Spectrum modem is still running nicely. The Spectrum router though leaves a lot to be desired. I have gone through 3 in as many years. I just bought my own.


Larry, I am not tech savy, but am trying to read up on Spectrum’s equipment. I have the 300mbps internet plan also. I just upgraded because we were having problems with streaming that kept buffering. But even with the upgrade I am still buffering. Our last speed test on wifi (through TV) was 107mbps, so I starting to wonder if it is a router issue. What router did you go with or recommend?

Hi Katy,

Before purchasing a new router, here are some suggestions: Check with Spectrum and see if you have the correct router and or modem for the speed of your new internet plan. If Spectrum did not verify the speed of your new connection after the upgrade, have them come out to your residence and verify the speed both to and from your modem. They can check your router and modem as well. If you are getting around 300mbps to and from the modem, then the router might well be the next place to look. Of course, if your devices are on WiFi, they will need to handle speeds with 802.11 n or 802.11 ac to be able to achieve 300mbps. Wired local network connections should have at least Cat-5E cables, and devices 1 gig ports. Lots of variables here, but these suggestions are a place to start.

The Spectrum supplied E31_2V1 modem functions well; however the Spectrum branded router works adequately, when it’s working. I have had three of them in three years. No rewards here for reliability. For me, the odds on a fourth one lasting longer than a year were not good. Spectrum has no specific standards other than the customer purchased router must handle the connection speed of your system, and that it supports the WiFi signal options that Spectrum offers. These specs provide a lot of choices. I chose an Asus RT-AC68U router, – roughly $139 on Amazon.

Hope this helps.


Do I need to have Spectrum put this modem into bridge mode if I already have my own router? Is the E31T2V1 a router also or modem only? Worried about double NAT.

Larry I have that Spectrum Modem E31T2V1. Everything was okay until recently when I would lose connection for a short time about once a day for about a week. Then today it lost total connection. Now, the device blinks the blue light next to Power about 10 times and then it once freezes both the blue light along with a new second light, the battery red light which is lower. Then the modem repeats the light sequence by blinking the blue light 10 times and then freezes the blue and red lights once. Did something like that light blinking happen when yours stopped and found out it was a connector to the telephone pole, or do you think it is likely my modem? Thanks.


No, mine simply lost connection and eventually reconnected, and did this over and over again. Your issue sounds like the power supply to the modem, or the modem itself is failing. I would get a Spectrum tech out pronto.


Hi there Larry. I have the same modem and I also have the 300 mb connection. I use the router that came with it. And i was thinking about upgrading to a more powerful modem/router for better gaming experience.
Do you think that’s it’s even worth it considering how well this modem works?


The answer is really in how your games are playing. If you have smooth video, not dropping frames, no buffering, then I think you are already good to go. My modem performs great. I’m still using it. I changed my router, not because of performance but because it wasn’t reliable.

Hope this helps.


Hi Larry,
I am just switching over to Spectrum and their modem (Hitron E31N2V1) should arrive soon. You mentioned in a reply that the modem does not need to be in a bridge mode to connect to a router. I have the Netgear Orbi mesh network. The Spectrum rep did not ask for my router’s MAC address. How should the WAN IP be configured? Thanks, K

Ditto. I used it behind a MacBook Pro, two different routers, etc. Also, no need to power cycle the cable modem after disconnecting and reconnecting between devices like the older cable modems which was annoying! 🙁

Interesting article. Less than 24 hours ago I replaced my Ubee (one piece) to the new Spectrum modem and router (2 pieces) I miss one single unit. Regardless, my security cameras, water sensor alarms, and smart plugs that rely on 2.4g are now dead. Spectrum tells me my new equipment is a “smart” device where it auto-selects whether to connect and pair with 2.4 or 5g devices, etc, unlike to older Ubee that provided me two separate networks (2.4g and 5g) that I could select at any time. Previously Spectrum techs would suggest to save 5g for TV streaming, and use 2.4g for phones, tablets, computers, smart devices, etc. That way we don’t overload on one. Seems now that I only have all-in-one network, my tv’s, computers, tablets, are fine. However, what doesn’t connect, or be found are all my other smart devices i.e. smart plugs, water sensor hub controlling alarms, DLink security cameras. They rely on 2.4g. These rely and work with my appropriate phone app. Any suggestions? BTW…Spectrum tech support told me my new devices are made by Sagemcom (a French company). On my Spectrum app it says, Motorola and Askey. Modem: SAC2V1K and E31U2V1. Lots of confusion. And certainly not plug n play. If there are any suggestions please let me know. Perhaps I will have to completely replace all my 2.4g dependent smart devices. Two of the three devices are only 5 months old. Sad. Thanks. – Al


I don’t know that you are getting the right answers from Spectrum. Simply, 5g is faster but has less range than 2.4g. Devices closer to your router would likely most benefit from 5G, while those further away would benefit from 2.4G. If your modem is broadcasting both bands, then your devices should be able to log into the appropriate band. Verify that both bands are broadcasting. Do you see that both bands are available when you connect, say for example your laptop? If you are only seeing 5G, then the 2.4g band is not running. If you see both bands, then check the connections on each device needing 2.4g. The router, as far as I know, isn’t determining what each device needs, the router simply supplies both bands at the same time. The device itself will seek another band available if it loses connection. I looked at the manual for the router, and the interface is minimal. I had the RAC2V1K version, and went through 3 of them in three years. They are not really durable. When the last one failed, I bought an Asus RT-AC68U.

I hope this helps.


We have the “Spectrum” E31T2V1 modem, TCH P/N: CVA4001CHR-R (the Technicolor version I believe) from Spectrum, made 5/2019. Here is the concern that I have: Is this modem, reportedly being a Broadcom chipped device, subject to the Cable Haunt vulnerability? Here is an article about Cable Haunt: Sources report that Spectrum has no comment/ or has ignored requests for information about this. This latter site is mostly about router security (not modems), but does mention Cable Haunt and Spectrum’s response:

PS If anyone figures out how to get to the configuration page for this model, please advise. I get refused using or

I cannot find a manual for this modem, either. Anyone?


I did not see your modem listed in the article. It also sounds like a hacker would really have to want to get in to go through the hoops necessary to complete this exploit. Sound like a bot wouldn’t be able to do it, which rules out a large number of hackers from the start. You are never safe on the internet, but the odds seem to be in your favor on this one.

Try as you might, I don’t believe you will able to access this modem. I have not heard or found away to do it.


Charter locked their cable modems down hard. No one had gotten in them (yet). I did find a detailed “Charter D31 eMTA – E31N2V1 User Guide.pdf” that shows the detailed goodies inside. I wished we could access them like its logs and statistics.

Hi There,

I went through a rabbit hole of investigations and led me here to this site. I’ve recently switched to the Hitron E31NV21 and anytime I play Call of Duty, it shuts off my entire internet after the game ends. It’s due to this modem having the Puma chipset that is defective. I’m planning on switching to their Technicolor E31TV21 to see if this resolves the problem as it carries the Broadcom chipset instead. How’s your internet been since using the Technicolor modem?


Though I don’t do much gaming, I send and receive a lot of data through the modem. I stream all of our television and movies. I own/manage an online store, and upload thousands of images to the site. I also download thousands of images from vendors and manufacturers to my local server. I have had issues with Spectrum’s routers (finally bought my own), but the modem (with the Broadcom chipset) has performed like a champ.

Hope this helps.


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