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Question: Voltage rating of E4200 Does the power adapter of E4200 support both 110v and 240v power supply?
Document: :)Oh, and in case you are wondering this thing comes with a switching power supply (110-240v). This means you can take the router with you, and use it anywhere in the world.
The 12VDC power supply quit working after a few days of use in my home. This new model is basically the same as a previous Cisco Linksys model. No measurable improvement. I was ready to return it but it is a hassle to ship it back, so I decided to just replace the defective power supply.
Tried everything to resuscitate it, re-flashing firmware, reset, power-cycling, couldn't even get it into recovery mode by holding reset button while powering on. Very disappointed in an expensive router with only an 8-month lifetime. I've downgraded rating from 5 stars to 2 stars because of this. Replaced with an Asus RT-N56U router, which is now working great for me. Hoping for more than 8 months out of it.
For international users it has 110-240V universal power adapter.Cons: It is expensive. The speed of 450M Hz is for data transfer between machines within the network and will not increase internet speed. The 5 GZ band range is really small may be 40 ft. If you go to the basement you may not see 5G Hz band network. The default 2.4 G Hz network has good range but not more than any normal router.
Wrong . . . it is a little different. So, I share the set up steps here below, I hope this will be helpful for other UVERSE users.First, you need to set IP@ of E4200 to be in a different range from 2Wire, i.e.,- Connect E4200 to power support. Do not connect it to 2WIRE yet.
Great customer support. My last complaint is that when the E4200 is powered off, it takes time to reinitialize. I had the old router and cable modem on a switch so I  could kill power when I wasn't using them and when I turned them on, both came up almost immediately. Maybe I expect too much in the range category. But for a top of the line router I don't think 100ft away should only show two bars in a house.
*****2nd follow-up (8/27/11)Called Cisco Tech support on this power light issue. They blame it onpower surge even though I had the router on a surge protector already.Not very satisfied with this explanation. Returned the E4200 to the store andbought another E4200.Now my computer cannot read the installation CD in the newly bought package.Cisco/Linksys should really look into their QC procedures.
The E4200 has great features and specs. Quality and customer support - not so much.I installed and set up the wireless router but could not get the WAN address to update. Went thru the standard, activities, - power down the DSL modem, power down the router, and power them back up in sequence. Still did not work. Called Cisco Support - went thru the same activities. After 30 - 40 minutes, Support said it was defective and asked me to return it.
I have purchased this Linksys E4200 seeing good star rating at Amazon.Surprisingly the device not good for coverage what it claims.I am in a 1516 SqFt house and hardly any L bends and this signal does not reach even from 20 Ft distance.
That rating comes from a combination of bad customer service on the part of Linksys and bad engineering/design in the "value added" features that they attempted to build into the E4200. Specifically:*  The Twonky media server. It's an emasculated version, don't even think about tweaking the configuration, you can't. I have experience with server based Twonky and thought this was really cool thing to have on a router.
Answer: Update. Just Received my product. The adapter is a universal adapter which accepts 110-240V