Cablevision Systems Corp. said its high-speed Internet service, Optimum Online, recently passed the 2 million-customer milestone.

The company claims an impressive 44 percent penetration rate.

Cablevision in 2006 raised the speed of its core Optimum Online service from up to 10 Mbps downstream and 1 Mbps upstream, to new speeds of up to 15 Mbps/2 Mbps.

The company also deployed its first premium tier high-speed Internet product, Optimum Online Boost, which offers customers up to 30 Mbps/5 Mbps. Cablevision also offers a special order high-speed Internet service, Optimum Online Ultra, which offers symmetrical 50 Mbps connections for less than $200 per month, a service that the company said is attracting business users.