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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. A DS1/T1 Line can also be Bonded DS1/T1 Line ATM or Asynchronus Transfer Mode is a very expensive switching solution that is used in deliver OC-3 and OC-12 lines. There are 3 standards of Ethernet that are covered by IEEE 802.3 what is commonly known as the CSMA/CD Protocol. Packets are forwarded along a Label Switch Path or (LSP), where each label switch router (LSR) prioritizes each label whether it be Data, Video, Voice, etc. solely based on the contents of the label. An OC1 or Optical Carrier Level 1 is a SONET line and transmits data at a rate of 51.84 megabits per second with a payload of 50.112 Mbps and an overhead of 1.728 Mbps over optical fiber SPE (Synchronous Payload Envelope) is the electronic envelope that transmits the data over the OC12 Line also known as the Payload. G.729 transmits at 8 Kbps and has superior bandwidth utilization which requires a license and is error tolerant. OC-3 are called OC-3c when not being multiplexed from a single data source, the letter "c" (standing for concatenated) |
