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T25

Xfinity Voice and DOCSIS® 3.1 Gigabit Cable Modem

  • 72 Topics
  • 159 Replies
72 Topics
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The Many
DaveBaughThe Many
asked in T25
Unable to connect telephonic line

New Arris modem, t25, on Comcast cable. Power, cable, Ethernet & phone lines all connected. Internet/Wi-Fi work fine. No dial tone on phone? Suggestions.

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henryellingsenThe Many
asked in T25
Can hardly see modem lights

The modem lights on my T25 are very dim.  I remember them to be much brighter.  They also look amber in color.  Has something been done to cause this?

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plemans
Juggernaut
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Roberts123The Many
asked in T25
T25 bridge mode

How do I get my T25 out of bridge mode? I can log in using 192.168.100.1but I don’t see that option. If I perform a factory reset will that do the same thing? Once in standard mode, can I go through my new switch to get wired and wireless devices to the internet from XFinity?

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The OneThe Many
asked in T25
T25 experiencing T3 and T4 errors

I have been dealing with this issues for quite sometime. And comcast is trying to implicate that there is nothing wrong with the lines yet these error messages are very specific in what's happening. The tech arrived today to tell me that the lines are okay. But the presence of the error codes he could not tell me why they was showing other than the issue is on the modem. Which is a classic move for Comcast. I am asking the community if they have experience this phenomenon. What is the solution? 

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turnquistThe Many
asked in T25
Caller ID Problems T25

Periodically the modem won’t display the caller ID on the phone, just says incoming call.  Ate the same time the voice on the phone call becomes scratchy.  Reboot modem and all is well for a while again.

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Wi-Fi Warriors
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edpomThe Many
asked in T25
Repeated random connection resets with Comcast/Xfinity cable voice modem T25

I am on my 3rd Arris T25 install in the past 3 weeks. Each install works, shows on the Xfinity app as connected, but randomly resets with loss of connection for 2 to 5 minutes each time.Can go several hours without a drop, then drop randomly between 5 minutes and 30 minutes between events.System was working perfectly with the Xfinity leased voice/wifi/cable modem. Nothing changed other than replacing their modem for the purchased T25 non WIFI unit, .I have always used my own WIFI router.  This driving me nuts and no support from Comcast other than trying to send a tech for 100 bucks / visit to analyze my end.. As an engineer, replacing a perfectly  working system/modem with another modem means my system is 100% normal, unless the spec on the Arris T25 is remarkably different from that of the Xfinity modem. As the T25 is approved for use by Xfinity, what the heck is going on?Thanks

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Wi-Fi Warriors
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Sendo427The Many
asked in T25
surfboard central app network refresh problem

Hi every time I try to refresh the network on the app it just shows me the fing advertisement and then I press later and it doesn't do anything. 

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BrianB-616The Many
asked in T25
Can't connect to T25 web manager

Just got a T25 for the voice support (the SB8200 did not support voice) - the BlueGlobe service is just too expensive - got it connected and had to call Xfinity and get everything straightened out…First, I cannot figure out how to connect to the T25 for the Web Manager… I’ve been searching the web and trying to add a route in my router (running DD-WRT on an older Belkin unit F7D7301 model) with no luck - I am not a noob with tech, but some things are still a ‘head scratching’ moment to me… Need more info about my situation? Please ask…Secondly, and this might be solved once I get web manager access, is that the T25 seem to ‘drop’ data service at least (haven’t tried voice calls yet when data is out..) once a day. DISCLAIMER: My T25 was just installed Friday 5-19-23 and today is Saturday 5-20-23..

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rsabellaThe Many
asked in T25
New T25 can't add to Surfboard app

I already activated a T25 with Xfinity and is working well so far.I want to update to any available firmware version, but can’t add this model to Surfboard Central app, as I did with my old one SB6190.Any clue how to do it?Thanks! 

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RedtarenThe Many
asked in T25
T25 not giving me speeds i pay for

I pay for 800mb and I get 300mb I have a nighthawk R7900 any ideas to fix this?

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plemans
Juggernaut
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revengejrThe Many
asked in T25
T25 keeps losing internet connection

I bought this house 2 years ago and I hired an installer to setup my wifi as I was moving from out of state and wanted things setup before I got here. Otherwise I consider myself very tech savvy as I was previously a network admin at a large international law firm, and I would have done the install myself. We have Xfinity here and he suggested outright purchasing a T25 modem instead of renting. Having previously owned a Surfboard modem when I was on Optimum for nearly 20 years and having almost no issues it, I said that would be fine.  It was working flawlessly up until about 2 months ago. I work from home and during business hours, I can not have down time. I use a PC and laptop, both of which are hardwired to a TP-Link Archer C5400. I had a 2nd Archer A20 hardwired to the C5400 operating as an access point. One day, suddenly, my entire house lost internet connectivity, nothing hardwired or wireless was able to connect to anything. I rebooted the C5400 thinking that was the issue but

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Phil85The Many
asked in T25
t25 new install

Just activated my t25, but the ethernet ports are not working.   Did I miss a step?

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plemans
Juggernaut
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dtaylorThe Many
asked in T25
wifi speed T25

I own Surfboard T-25 Modem. I am paying for 1000 MBPS thru my ISP. The best speed I have been able to get thru speed tests is 400-450 MBPS. ISP said everything checks out on their end.When I connect laptop to Ethernet port on Modem I receive Unidentified Network Connection so I am not able to test the speed there.

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plemans
Juggernaut
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swithdrawnThe Many
asked in T25
Request for Support / RMA - How to Contact Support?

Hi there,I have a T25 that is quite clearly defective (another modem works fine) and need to initiate a return. What is the process for requesting in-warrantee support? Live chat is offline even though it’s during listed hours. There is no phone number. There is no email address. I have seen “how to contact support” posts referenced in this forum, but the referenced post is no longer accessible. Thank you for any support you can provide.More context:My T25 was purchased less than 30 days ago but is outside of the store return window. Performance started degrading four days ago, and now it’s not able to return any signal to Xfinity/Comcast - they cannot see the modem at all. Netgear CM1200 which I was planning to sell works just fine, with speeds of over 900Mbps on our gigabit plan. 

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DerfhillThe Many
asked in T25
LAN IP address

I am unable to access the admin page using the LAN IP address 192.168.100.1 as it says site cannot be reached. Also when powering up xbox it tells me to connect to the internet. I am hard wired to the router and it says NAT type is unavailable.

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plemans
Juggernaut
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The Many
Rick G.The Many
asked in T25
Restore T25 to factory settings version 11.01***/update firmware, etc.

Purchased new T25.  Using successfully with Optimum internet.  Trying to log in to modem (to change DNS).  Does not open welcome page to change admin credentials.  Goes directly to status page.  Holding reset button for 20+ seconds did power cycle only???  software version 11.02.142, so not “after 11.02*****” which supposedly restores factory settings with held reset button. How do I restore factory settings and set up credentials?

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plemans
Juggernaut
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CablejeffThe Many
asked in T25
use t25 from xfinity on optimum

Bought a t25 supposedly compatible with optimum, but was used for xfinity.  Optimum could activate it, but no phone ot internet worked

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plemans
Juggernaut
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RandyThe Many
asked in T25
T25 connection issues thru router

I purchased a T25 modem to replace the Xfinity Xfi. I have internet connection from T25 lan port to a pc, but not when T25 is connected to my router. I reconnected the Xfi. Every thing works!!!What am I doing incorrectly for the T25 not to connect thru router?  I had a Xfinity tech out today helping. He don’t know either.

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plemans
Juggernaut
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rpfutrellThe Many
asked in T25
Repair Request

I purchased a T25 that stopped working, and wondering if Arris has a way to diagnose it for me and repair it ?Given the cost/initial investment of these devices  I'd consider repairing it vs. buying a new one.  The warranty has expired by a couple of months, but I believe it can be ♻️ recycled ♻️ and/or repaired. Thank you in advance 

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Rockstar!
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pgm554The Many
asked in T25
Comcast speed issues t25

I had an older modem tm225r that I replaced with a t25 because of fluctuating speed issues.It could vary from 250 or 300 to under a 100 (wired).Measuring from the Ethernet port on the t26 using a laptop and using Comcast speed site,with the new modem I still get under a 100 even though my service says 500 down.There were issues with cabling and connectors that they just replaced.His handheld meter is saying 600 down,but several different laptops said under 100.Any ideas?

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plemans
Juggernaut
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Cable Modem Commandos
Siuu1994Cable Modem Commandos
asked in T25
Why my ports on the SB8200 are not working?

I just purchase my new modem and i was wondering where is written down the info about the name of my new network and the password

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Wi-Fi Warriors
TechRep
Cable Modem Commandos
TechRepCable Modem Commandos
asked in T25
Battery backup

Hi, I used to have one modem that supported battery backup but I just decided to upgrade ny equipment to a T25. So I’m wondering if this modem has battery backup and where I can purchase that battery

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Adrianombcc200
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