Optimum Online: Many factors affect speed. Actual speeds may vary and are not guaranteed. Cable hook-up, minimum system and modem requirements apply. Other restrictions apply. Where available. A cable modem will be provided for the term of your service and must be returned when service is terminated. All returned equipment must be in good working order. The cable modem is the property of Cablevision. Lost, stolen, unreturned or damaged equipment is subject to a non-return fee.