An OC12 is a type of high-speed dedicated circuit. The OC12 transmits data at a speed of 622 Mbps. It is a large group of circuits that is equivalent to 4 OC3s or 1344 T1s. The term OC stands for Optical Carrier. The OC12 circuit is a specific range of digital signal that can be carried on SONET fiber optic network. There are various levels of OC circuits depending on the data rate bit stream that can be carried by the signal.
A T1 is a high-speed dedicated circuit that consists of 24 channels. Each channel is flexible and is available to anyone when not in use. This makes the T1 extremely useful. The amount of T1 circuits required to provide service to your office is less than the amount of dedicated circuits that previously may have been needed. Each T1 can provide service to approximately 50 to 100 typical telephone users.
The T1 is the smallest unit of dedicated digital circuits and transmits at a speed of 1.544 Mbps. The T3 is equal to 28 T1s and transmits at a speed of 43.232 Mbps. An OC3 consists of 100 T1s and transmits at a speed of 155 Mbps. An OC12 transmits at a speed of 622 Mbps and equals 4 OC3s. An OC48 equals 4 OC12s and transmits at a speed of 2.5...
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