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Optical Carrier Level 12 (OC-12) circuits work as an integral part of fiber optic backbones for large networks with extremely big IP bandwidth needs for VoIP or Voice over IP, Video Conferencing and varying Internet applications. A Bonded DS1/T1 Line is also known as a NxT1/DS1 Frame Relay is basically not used anymore as far the Internet is concerned, especially with the bandwidth requirements the way they are. 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. 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 When discussing the STS-12 optical carrier frame, the following acronyms apply: SOH (Section Overhead), SPE (Synchronous Payload Envelope), LOH (Line Overhead) and POH (Path Overhead). Codec G.726 transmits at 16 Kbps, 24 Kbps, 32 Kbps and 40 Kbps which is an improved version of G.721 and G.723 but different from Codec G.723.1 An OC3 is also known as STM-1x (Synchronous Transport Module) |
