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OC192 Basics
OC192 is the abbreviated term for Optical Carrier level 192, used to specify the speed level of fiber optic networks. OC-192 speed is measured through SONET (Synchronous Optical Network) standards.
OC192 works as a reliable fiber optic backbone for large networks with large voice/data/video bandwidth needs.
OC192 is most often made up of what is called a "SONET ring" to maintain it's reliability (redundancy) for high speed transmissions.
A common method of back up used with a ring is called a "bi-directional ring topology." This bi-directional ring is a physical topology which deploys two sets of fiber strands.
The first strand for the connection is for sending and receiving. The second strand will reroute traffic from the original transmission in another direction should the first strand break or malfunction.
Bi-directional ring topology help ensures constant reliability within SONET based network.
The primary function is to take , synchronize , and transport data and voice at the speed of 10 Gbps reliably via light pulses. Common sources of this data include ATM & Fame Relay switches, T1 and T3 multiplexers, and various IP networks.
STS-192 is the abbreviated term standing for Synchronous Transport Signal level 192. STS and SONET OC carry the same electrical equivalent; therefore STS-192 is the equivalent to SONET level OC192.
STS-192 is an optical carrier frame consisting of the following characteristics:
SPE (Synchronous Payload Envelope), SOH (Section Overhead), POH (Path Overhead), and LOH (Line Overhead).
SPE is the electronic envelope that carries the data over the line otherwise known as the Payload.
SOH maintains all the links within OC192 while relaying line status to the end user. The information within SOH includes the status of transported data, the notification of messages, as well as alarm levels.
POH is responsible for the functionality of the data envelope in OC-192 while in transit. Such functionality includes vital information for the management of end-to-end networks. POH travels within the data envelope until the data is demultiplexed through multiplexing equipment.
LOH controls the reliable transit of the data over an OC192 line.
LOH and SOH combined on a SONET OC-192 network create what is referred to as TOH (Transport Overhead). TOH is one of the elements responsible for signaling and control over OC-192 network lines.
SONET
OC-n MegaBit/Gigabit
OC1 51.84
Mbps
OC3 155.52
Mbps
OC9 466.56
Mbps
OC12 622.08
Mbps
OC18 933.12
Mbps
OC24 1.244
Gbps
OC36 1.9
Gbps
OC48 2.488
Gbps
OC96 5
Gbps
OC192 10
Gbps
OC256 13.271
Gbps
OC768 40
Gbps