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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🚀 Elevate Your Internet Game!

SAVE BIG ON RENTAL FEES - Own your modem and save up to $168 annually on rental fees.
UNLEASH LIGHTNING FAST SPEEDS - Experience internet speeds up to 800 Mbps with cutting-edge DOCSIS 3.1 technology.
SIMPLE SETUP FOR INSTANT ACCESS - Get online in minutes with easy plug-and-play installation and the SURFboard Central App.
FUTURE PROOF YOUR INTERNET EXPERIENCE - Stay ahead of the curve with compatibility for Xfinity Internet & Voice service.
DUAL GIGABIT PORTS FOR ULTIMATE CONNECTIVITY - Connect multiple devices seamlessly with two 1 Gbps ports.

The ARRIS Surfboard T25 is a state-of-the-art DOCSIS 3.1 Gigabit Cable Modem designed for Xfinity Internet & Voice service. With two 1 Gbps ports and compatibility for plans up to 800 Mbps, it offers lightning-fast speeds and significant savings on rental fees. The modem features a simple setup process via the SURFboard Central App, making it an ideal choice for gamers and streaming enthusiasts alike.