<P> OC - 12 is a network line with transmission speeds of up to 622.08 Mbit / s (payload: 601.344 Mbit / s; overhead: 20.736 Mbit / s). </P> <P> OC - 12 lines are commonly used by ISPs as Wide area network (WAN) connections . While a large ISP would not use an OC - 12 as a backbone (main link), it would for smaller, regional or local connections . This connection speed is also often used by mid-sized (below Tier 2) internet customers, such as web hosting companies or smaller ISPs buying service from larger ones . </P> <P> OC - 24 is a network line with transmission speeds of up to 1244.16 Mbit / s (payload: 1202.208 Mbit / s (1.202208 Gbit / s); overhead: 41.472 Mbit / s). Implementations of OC - 24 in commercial deployments are rare . </P> <P> OC - 48 is a network line with transmission speeds of up to 2488.32 Mbit / s (payload: 2405.376 Mbit / s (2.405376 Gbit / s); overhead: 82.944 Mbit / s). </P>

The transmission rate of an optical carrier oc-24 is