I use this to replace a old Docsis 2.0 Motorola SBG900 . the sbg900 work well enough until I purchase a Logitech Revue , which have issue with the sbg900 , such as drop connection which require a reboot of the router , among other thing . after do my research , I find that the zoom 5341j be Comcast compatible and capable of connect to 8 download channel and 4 upload channel , compare to the much more common 4down x 4up configuration . keep in mind that the Zoom 5341 -lrb- with no j at the end -rrb- be a 4x4 configuration . the Zoom 5341 be a modem only , not have a wireless router embed like the sbg900 , but I already have a linksys wrt54g router , which I have already pull out to try and rectify my problem with the Logitech Revue . the sbg900 keep drop the wire connection to the Linksys though ... the Zoom 5350 be compatible with Comcast and have the same spec as the 5341j , but also have a wireless router and 4 wire port as well . I consider it , but decide to go with seperate piece for modem and router duty . the evening that the zoom 5341j arrive , I install it in place of the sbg900 , and plug my laptop in . once it have establish a connection , the Comcast device activation page come up in my browser , and I be able to switch the activation from the sbg900 to the zoom 5341j in minute , with no need for phone call to support . the configuration of the zoom 5341j be very simple , and I make no change to the default configuration . I do check the connection , and find that I have 8 download connection and 2 upload connection . it appear that Comcast in my area will only provide 2 upload connection . I plug the Linksys wrt54g in and have wifus a minute later . I find average speed to be about the same as before , but peak speed to be about 30 % faster , and this result in snappier browser performance , and quicker starting of streaming video . I also have find that the connection be more robust , as I have not be get the rebuffering and disconnect streaming video that I be get with the sbg900 . my problem with the Logitech Revue have also be solve , and the zoom 5341j have not be drop the wire connection to the Linksys wrt54g . that , combine with the performance enhancement , have leave I very happy .