though I be very happy with the sb6121 , I be somewhat surprise by the lack of a on\/off or network enable\/disable switch -lrb- maybe I miss something ? -rrb- . also , the led light up the room which require I to take evasive action . -lrb- since this be a d-3 modem -lrb- my previous one be a d-2 -rrb- and I have recently upgrade my isp provision speed , I do some test -lrb- before and after -rrb- . it work . nevertheless , it do encourage I to tweak my wi-fi access point 's 802.11 n configuration . -rrb-