this product be great ... for 6 month . then it fail completely . I can access the modem from my pc , but can not get through to the internet . fortunately I still have the old sb4200 from year ago . it be slower , but it still work . okay , 3 day later , I reconnect the sb6121 modem and it work fine . it do drop this morning -lrb- 8\/15 -rrb- but after turn the power off and back on , reconnect with no problem . it be a bit of a puzzle but for now , I be back to be satisfy . until the next time !?!