Question 1

does it work with Mediacom cable and voice service?

Accepted Answer

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

Question 2

Does this model still use the Intel Puma chipset?

Accepted Answer

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

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36ms : xxxxxxxxxx
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49ms : xx
50ms : x
52ms : x

Question 3

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

Accepted Answer

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

Question 4

does it work with cox cable and voice service?

Accepted Answer

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..

ASIN	B07MGPPNZD
Brand	ARRIS
Built-In Media	Power Supply
Color	Black
Compatible Devices	Personal Computer, Smartphone
Connectivity Technology	Coaxial Cable, Ethernet
Customer Reviews	4.1 4.1 out of 5 stars (1,670)
Data Transfer Rate	1000 Megabits Per Second
Global Trade Identification Number	00612572215845
Internet Service Provider	Xfinity
Item Dimensions L x W x H	6.8L x 18.2W x 26.8H centimeters
Item Type Name	Xfinity Voice Cable Modem
Manufacturer	CommScope
Maximum Downstream Data Transfer Rate	800 Megabits Per Second
Maximum Upstream Data Transfer Rate	8 Megabits Per Second
Mfr Part Number	T25
Model Number	T25
Modem Type	Cable
Number of Ethernet Ports	4
Number of Ports	4
UPC	612572215845

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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