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a modem and a router are completely different, i run 1 modem and 2 routers, a lot of times ISP's use modem/router combo devices because they are much more convenient however there is pretty big downfall to using modem/router combo's the router side is usually very lacking in features, capabilities and speed which is why i definately recommend and this is only if they can't fix it tomorrow either getting your own modem and router as seperate devices or getting a router and putting that modem into bridged mode so it no longer acts as a router but strictly as a modem seeing as the modem side of it is functioning correctly and at better then your advertised speeds 2 routers do not require multiple ISP subscriptions when setup right edit: here is a very informative and short explaination as to the differences between the two http://pc.net/helpcenter/answers/difference_between_router_and_modem

PGoodwin1 is correct if you are not running the older laptop the Wifi gateway ( what i decided to call your modem with wifi ) should be able to sync at the higher speeds such as 150-600Mbps what i ended up having to do was run two seperate routers in my house, one for wireless G and older devices and one for wireless N that way my faster devices wouldn't be dragged down by the slower ones... not saying you should do this by any means its a pain in the but and will require a little networking knowledge... if you do persue something like that we'll be more than happy to assist you though you can do this too by clicking the quote or multi quote button, i simply modified each quote box to only contain what i wanted to address at that moment so on the newer pc when connected to ethernet your seeing 40+Mbps? download speeds from tests here? you should be able to find a modem that will do phone+cable and possibly wifi too but this feature i recommend turning off infact you could keep your current modem (if ethernet is working fine) and do the same thing, i recommend getting an actual router it will be 10x more secure and probably have a much stronger radio and we can even help you with this aswell sorry about all the technical jargan essentially what i was trying to get acrossed is your computers show they are at 54Mbps, that number should read 100Mbps or higher to acheive your full download speed because wifi needs quite a bit over overhead

Thanks for your input. I know of the lists of acceptable modems for replacement. I just hadn't looked into it far enough to know if there was one that handled the telephone too. This Xfinity has the phone line plugged into it which feeds back to all the phones. I suspect there is one no doubt. I'll check that more closely. And thanks to you up there in the "clouds" with all your data. lol I do appreciate your response. Jack ":-D

If you tell them you want to use your own modem, you can return their modem and they should drop the modem rental fee. On their website, you can probably find a list of modems approved for use with their system. You can compare reviews on them, or post on TestMy and ask other Comcast users which ones they have and what their experience is. If the laptop really is wireless G, when you're not using it, either turn the laptop off or turn that compute t's wireless off, and you should see the wireless N speeds on the other computer.

it did indeed post jack, your first two posts must be reviewed and approved by a moderator before you can freely post. this helps us keep spam to a minimum. thank you for taking the time to respond in a little more detail i think i might be able to shed a little light on a few things for you what has most likely happened is the wireless radio is either malfunctioning or has failed completely... Yes you are completely correct, wifi should be considered seperate from ethernet (direct connection) well having one off and the other on shouldn't affect the speeds unless they are both downloading something simultaneously if both PC's are on wifi at the same time then its not an entirely crazy thought that both would exhibit the same issue at the same time and it not be the actual cable companies fault but more so the wifi being delivered by that modem/wifi gateway now if you have one pc directly connected via ethernet and one via wifi and both are exhibiting the same issue at the same time then you can rule out the wifi link being the issue and look more at the actual modem also it's very good that you have already ruled out interference cable companies often do this, most cable companies do give you the option to get your own DOCSIS3.0 modem and router which is what i often recommend that way you can choose what suits your needs better, you'll know its a brand new device without a shadow of a doubt and it will be tailored to what you think you need now and possibly in the future the NEW pc you have is most likely connected using Wireless N, and the older laptop is definately using wireless G(54Mbps) the thing with wireless N is it supports much higher data rates then wireless G as you were already seeing some newer wireless N cards support up to 600Mbps by bonding two wifi channels 300Mbps+300Mbps even though your new pc is most likely connecting with wireless N what you are seeing is the sad fact that when a wireless gateway or router is utilizing a backwards compatible mode so that both N and G devices can both connect at the same time wireless N devices will operate or sync no faster then the slowest device can which in this case is wireless G(54Mbps) so even though your new pc supports wireless N which should have at least the capacity of 150Mbps the wireless gateway slows the N cards max sync rate to that of the wireless G cards max sync rate as far as 54Mbps of wifi being enough to carry a 50Mbps cable connection this just isn't true you would need to connect at over 100Mbps on wifi to be able to achieve all of your 50Mbps connection because wifi needs A LOT of overhead for dropped or lost packets and sync rate variation on my own wifi i have to be connected to my router at atleast 162Mbps to be able to hit 50+Mbps download speeds i hope this sheds a little light on your questions sorry if i lose you some place just smack me if i did thanks ~ Mark