I have to send this one back because it be the wrong one . I be not tell which model I need from my internet provider -lrb- Brighthouse - Roadrunner High speed internet -rrb- , I be just tell I need a DOCSIS 3.0 modem . after I hook this one up -lrb- very easy -rrb- and call Brighthouse to activate it , that be when I find out I have the wrong one . I actually need the sb6141 model , so I re-order from Amazon and it hook up -lrb- again , very easy -rrb- and call Brighthouse again and be up and run within 15 minute . very pleased and no more rental fee .