Optical Carrier Level Circuits

What is an OC-48?

An OC48 works as a reliable fiber optic backbone for large networks which require volume extensive voice/data/video traffic. It is a long-haul backbone fibre connection capable of transmitting data at 2.45 Gbps.

Optical Carrier lines provide content providers, ASP’s/ISP’s & large enterprises with dedicated Internet connectivity. These Optical Carrier Level circuits are an ideal solution for high end bandwidth users where connectivity is essential for operations.

To put it into perspective...

the speed of an OC48 is the equivalent of having

48 T3's OR 1,344 T1 lines

To maintain it's reliability during high-speed transmissions an OC-x circuit is often made up of what is called a "SONET ring" or "bi-directional ring topology"  This is a common method of back up which deploys two sets of fiber strands along the ring structure.

The first fiber strand is for sending & receiving, the second strand reroutes voice/data traffic from the original strand in another direction. This is done should the first strand break or malfunction. Bi-directional ring topology helps ensure redundancy within OC48 networks.

An OC48s primary function is to take, synchronize & transport data and voice reliably at 2.45 Gbps. Common sources of this data include ATM and Frame Relay switches, T1 / T3 multiplexers, and extensive IP networks.

OC-x Basics...

'OC' stands for Optical Carrier and is used to specify the speed of fiber optic networks conforming to the SONET standard. SONET, (Synchronous Optical Networks), includes a set of signal rate multiples for transmitting digital signals on optical fiber. The base rate (OC-1) is 51.84 Mbps. Certain multiples of the base rate are provided shown below with bandwidth amounts. Asynchronous transfer mode (ATM) makes use of some of the Optical Carrier levels.

      OC-1 = 51.85 Mbps
      OC-3 = 155.52 Mbps
      OC-12 = 622.08 Mbps
      OC-24 = 1.244 Gbps
      OC-48 = 2.488 Gbps
      OC-192 = 9.952 Gbps
      OC-255 = 13.21 Gbps

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