This constant innovation in the telecom industry has given the product OC-12. OC-12s are commonly used by ISPs as WAN connections.
TECHNICAL SPECIFICATIONS OF OC-12
VERIZON
An OC-12 bandwidth translates into four OC-3s or 336 T1s at 622 Mbps. OC-12 is the abbreviated term used to denote Optical Carrier 12, wherein the number 12 indicates the speed at which, data can be transferred through the fiber. STS-12 is the abbreviated term, which stands for Synchronous Transfer Signal 12. STS and SONET OC carry the same electrical equivalent, thus it can be said that STS is the equivalent of OC. STS is an optical carrier frame consisting of the following characteristics: SPE, which is the electronic envelope that carries the data over OC-12 bandwidth, otherwise called as payload. SOH maintains all the links within OC-12 while relaying 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-12, 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 de-multiplexed through multiplexing equipment. LOH controls the reliability transit of data over an OC-12 bandwidth line. LOH and SOH combined on a SONET OC-12 network create what is called as TOH (Transport Overhead), which is one of the elements responsible for signaling and control over OC-12 lines.
FEATURES OF OC-12
OC-12 bandwidth offers complete 622 Mbps circuit provisioned from a Verizon owned hub to the customer's premises. Fixed bandwidth, selected by the customer, available at a fixed monthly cost. Dedicated installation engineers, Primary-secondary DNS hosting, IP Address allocation, 24x7 technical support, Weekly/Monthly usage statistics, industry leading service level agreements, SMTP (Simple Mail Transfer Protocol) Relay, etc. Additionally, it has the following advantages: Bandwidth can be added as the system grows without any major overhauls. These circuits have a higher performance, lower latency and increased reliability vis-a-vis metropolitan Ethernet or long haul waves. The price of an OC-12 circuit is based on the carrier, location of the service, and the application used. These are costlier than OC-3 carriers are.
OC-12 Bandwidth - Demystified
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