Motorola 's sb6121 cable modem be one of the best cable modem available on the market right now , if not the best . it be a full docsis-3 .0 modem , but also fully backwards compatible with DOCSIS 2.0 and all the way back to DOCSIS 1.0 . in short , it should work on any cable system . it be future-ready with ipv6 support build in . I buy the sb6121 to replace a D-Link dcm202 which have start randomly drop the connection several time a week , sometimes multiple time a day . installation be trouble-free ; just connect the cable and notify you cable company . -lrb- have the MAC address from the label on the bottom of the modem handy when you call . -rrb- many cable user report speed gain on update to a DOCSIS 3.0 modem ; I be no exception -- my download speed go from 11.5 mbp to 12.8 mbp , and my upload speed increase by 50 % from 960kbp to 1.5 mbp . interface-wise , there be not a lot to say . the Motorola sb6121 's color graphical-icon lead indicator be much easier to identify and read from a distance than the D-Link 's closely space row of identical yellow-green led . you can look at it from across the room and see two steady blues and one blinking amber , and know at a glance you be in good shape . this be perhaps a more expensive modem than some , but it be worth it , and you can not fault Motorola 's reputation . it also carry a better warranty than many other cable modem . do yourself a favor and buy this oem-packaged version ; the shinier box on the retail version will not make you cable connection any faster . -lrb- but the chance be good that this modem will . -rrb-