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

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

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
Box Contents	Power Supply
Brand Name	ARRIS
Colour	Black
Compatible Devices	IOT devices, Personal Computer, Tablet, cell phone, firestick, iPhone, streaming devices
Customer Reviews	4.1 4.1 out of 5 stars (1,675)
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 centimetres
Item Type Name	Xfinity Voice Cable Modem
Manufacturer	CommScope
Manufacturer Part Number	T25
Maximum Downstream Data Transfer Rate	1000 Megabits Per Second
Maximum Upstream Data Transfer Rate	1000 Megabits Per Second
Model Number	T25
Modem Type	Cable
Network Connectivity Technology	Coaxial Cable, Ethernet
Number of Ethernet Ports	4
Number of Items	1
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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