does it work with Mediacom cable and voice service?

No, T25 is compatible to work only with Comcast Xfinity's cable internet subscription

Does this model still use the Intel Puma chipset?

It has the PUMA 7 chipset -> the 5,6 & 7 chipset are all vulnerable to the TCP issue -> but PUMA 6 is the most impacted by this issue. But you have to be targeted for it to be an issue and is only really a problem if you do "fast twitch" gaming activities while targeted. A series of very many small TCP packets can be sent in a way that overwhelms the cable modem's buffers causing latency and jitter to spike to 100-150 ms while being targeted. There is a test on DSL reports that will test this TCP vulnerability for the PUMA chipset. Intel (chipset owner -> they bought PUMA from Texas Instruments several years ago) they did come out with a patch for this issue after about a year of it being in the wild -> my understanding is that the patch has been out since mid 2018 and should be pushed down to your modem by your ISP. I bought this modem (T25) and after having it provisioned by COMCAST/XFINITY -> I ran the TCP PUMA test and my modem passed without issue & performed just as well as the rental modem. You can buy this modem without issue or fear of this PUMA chipset issue... Latency Test Results from PUMA TCP Test 35ms : x 36ms : xxxxxxxxxx 37ms : xxxxxxxxxxxxx 38ms : xxxxxxx 39ms : xxxxxx 40ms : xxxx 41ms : xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx 42ms : xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx 43ms : xxxxxxxxxxxxxxxxxxxxxxxxx 44ms : xxxxxxxxxxxxxxxxxxxxxxxx 45ms : xxxxx 46ms : x 47ms : xxxx 48ms : xxxxx 49ms : xx 50ms : x 52ms : x

my arris tm822r has battery backup, which is great for when power goes out. does this modem have a battery backup?

No, T25 does not has the battery backup but you can use an external UPS power supply in case of power outages

does it work with cox cable and voice service?

Cox has support for ARRIS / Surfboard TM3402 here is a list. https://www.cox.com/residential/support/cox-certified-cable-modems.html best bet is to call them and ask. besides switching to gigablast and getting VoiP is a much better deal. you can actually save some $$ and get crazy speeds..

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🚀 Unlock Gigabit Power & Voice Clarity — Own Your Speed, Own Your Savings!

DUAL GIGABIT ETHERNET - Seamlessly connect multiple devices with two 1 Gbps ports for ultra-reliable wired networking.
BLAZING FAST DOCSIS 3 1 - Experience next-gen internet speeds up to 800 Mbps with cutting-edge cable tech.
INTEGRATED VOICE SUPPORT - Stay connected with two telephony ports supporting crystal-clear digital voice calls.
SAVE BIG OWN YOUR MODEM - Cut up to $168/year in rental fees by owning your modem outright—smart savings for savvy pros.
EFFORTLESS SETUP SECURITY - Plug, activate via SURFboard Central app, and enjoy preset Wi-Fi security for worry-free connectivity.

The ARRIS SURFboard T25 is a DOCSIS 3.1 cable modem designed for Comcast Xfinity Internet & Voice plans, delivering up to 800 Mbps speeds. Featuring two 1 Gbps Ethernet ports and dual telephony ports, it supports high-speed wired connections and digital voice services. With easy app-based setup and the ability to save on rental fees, it’s the perfect modem for professionals seeking reliable, fast, and cost-effective home networking.

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Brand	ARRIS
Product Dimensions	5.4 x 15.88 x 19.05 cm; 762.04 g
Item model number	T25
Manufacturer	CommScope
Series	T25 Xfinity Docsis 3.1 Voice Cable Modem
Color	Black
Number of Ethernet Ports	4
Voltage	100240 Volts
Are Batteries Included	No
Item Weight	762 g

ARRIS SURFboard T25 DOCSIS 3.1 Gigabit Cable Modem, Comcast Xfinity Internet & Voice, Two 1 Gbps Ports, 2 Telephony Ports, 800 Mbps Max with Xfinity Internet Plans,Black

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