OM3 and OM4 are designed for Ethernet of 10GB/s where OM3 can support this bandwidth up to 300 meters and OM4 up to 550 meters. OM3 is backwards compatible to OM2 and OM4 is backwards compatible to OM3 and OM2. In fact, You can also use OM3 cables to go with the OM4 cassettes.
