ARRIS SURFboard mAX (8×4) DOCSIS 3.0 Cable Modem, 343 Mbps Max Speed, Xfinity Telephone Capable for 2 Lines, Certified for Comcast Xfinity Only (TM822R)

XFINITY: Works As Described
XFINITY: Using their iPhone app will NOT work to provision the modem even when you fill inits MTA or HFC MAC: Address- several times. This device IS an ‘approved’ unit from their site!I connected this unit for this by ethernet STRAIGHT to my computer to avoid intermediate problems.It came up under NAT: 192.168.100.1 – and gave my computer an address from its own DHCP server.Nothing to do there.Went to XFINITY Chat so keep a copy of HFC MAC address on your Clipboard as they needed to seepasted by you several times..”Provisioning” all told took about 30 mins- When running, several ‘Now Wait’ Sessions.Done!Re connected to my routerWAN and RESTARTED BOTH. Twice. Wait…!The Unit then ‘recognizes’ my OWN DHCP request from the Router WAN portand this will switch it out of it own NAT mode address above after 5-10 mins to give a real ‘live’ Internet address through the Ethernet port ready for your Router to NAT WITHOUT Double-Nat issues.Note: you can see device STATUS but cannot change anything without some sort of God log-inwith unknown credentials; the rightmost [Adcanced] menu is Forbidden : ).you DO NOT need to configure AnythingBut you do need to tell Xfinity about it- they do the rest.The 2 VOIP phone ports presumably would be configured by Xfinity, for their service not you,EVERYTHING gets done from THEIR side including a firmware update that I noticed, without intervention,NOT by YOU. This is relatively Normal. Cost: same as about a 1-month Lease from XFINITYWorks fine, Happy.

Seems to work OK with xfinity and voice- moderate issue with setup
Got unit today to replace my comcast phone-wi-fi-router which while generally works OK, is a pain in the posterior re wi fi hotspot and hard to turn off wi fi channels I did not use or want_ I am using a netgear R6400 frouter- wi fi with much more flexibility now attached to my ArrisTM822R. AlSo ordered but yet to receive a $10 8 hour battery backup- much cheaper than the Comcast-xfinity do-all unit. Setup was a little confusimg- but having downloaded the manual and following it ( using a mac mini ) and firefox browser it was relatively easy IF one paid close attention to being sure to renew DHCP lease at the appropriate time. Got internet working- but problem with phone- which customer service was able to help out since I had a cell phone available to call. What the problem seemed to be ( my fault !) was plugginG the male phpne jack into phone2 instead of phone1/2 as a result of not carefully looking at the printing and following what I assumed was the same order as the lights. The other no issue issue had to do with waiting for all green NON flashing in accrdance with online instructions. The flashing light on LINK will always be flashing when connected to internet- all others will be solid green after about 10 minutes or so. Instructions could be clearer- thus the 4 star rating. IF unit continues to work OK- I’ll leave the rating at 4 stars. I’m in Wa state and an area which comcast is only service available via contract with city. keeping fingers crossed.FWIW dept – unit provided by Comcast was “Voice and Data Modem”ARRIS Group, Inc. TM822RSerial Number: 2C——DBDUAL BAND WI-FI supplied by comcast-xfinityUnit I purchased”Voice and Data Modem”Arris Interactive, L.L.C. TM822RSerial Number: A4—05PurchasedArris SurfBoardNOTE After a bit of digging I found out that IF yoiu put into your browser the ip numper of 192.168.100.1 you will get a major report- log of all the software and status info. also battery status if used..UPDATE 3 SEPT RE BATTERY INSTALL-…Copied from slip inserted with 8 hour battery for installationARRIS SURFBOARD TM822R PHONE INTERNET MODEM AUGUS 2017Please check the following in place before installing or using your Battery1) You must have an active phone service “provided only by your service provider” on your Phone Modem to use the battery pack.2) Back Batteries only support the PHONE PART of the modem.3) Internet part of your modem is not designed to be used with battery pack regardlessof if you have a phone service or not.4) Make sure your modem is directly Plugged into the Wall. (NO SURGE PROTECTORS OR POWER STRIPS CONNECTED OR APC SYSTEMS).5) Make sure the battery port is in good shape before you insert the battery as in most cases used and or rental modems have bent pins and may create an issue when inserting the battery properly.6) Your battery will now require 12-17 Hours Charge initially.7) A new battery will undergo three battery test stages;(a) an initial full charge,(b) a full discharge after that(c) a full re-charge back to a fully charged state.8) The full process will take about 6 days.+++++ MY NOTE USE 192.168.100.1 TO READ DETAILS OF YOUR MODEM