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An OC12 is the abridged term for Optical Carrier level 12 (OC-12), used to dictate the speed level of fiber optic networks. The OC12 speed is measured through SONET or otherwise known as Synchronous Optical Network standards. DS1/T1 Line may also deliver a Fractional DS1/T1 Speed. ATM or Asynchronus Transfer Mode is a very expensive switching solution that is used in deliver OC-3 and OC-12 lines. Metro Ethernet got its name from mostly being in metropolitan areas The LSR of the MPLS Network strips off the existing label at each hop and applies a new label that dictates how the next hop will forward the packet. The Optical Carrier (OC) is multiplied for use by other OC-n standards. For illustration purposes, an OC-3 Line is 3 times the rate of OC-1 Line SOH (Section Overhead) operates all the links inside the OC-12 while relaying line status to the bandwidth subscriber. The information within Section Overhead (SOH) includes the status of the notification of messages, transported data packets, as well as the alarm levels. A T1 Line/1.54 MB can transmit 24 simultaneous calls via VoIP at 64 KB using Codec G.711 or G.722 OC-3c as mentioned above concatenates (3) STS-1(OC-1) frames into a single OC-3 mirrored stream of data |
