Glossary of Terms


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The telecommunications and fiber industries are full of terms and acronyms. Our glossary of terms attempts to capture some of them.

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OECD: See Organization for Economic Cooperation and Development.

OFAP: See Optimal Fiber Allocation Plan.

ONT: See Optical Network Termination.

Open Access Network: A network designed and operated on the principal of a wholesale/retail split in which the network owner makes wholesale services available on the network to competing service providers who provide retail services to end customers. This is sometimes called an open access network.

Open Service Provider Network: See Open Access Network.

Open Systems Interconnect (OSI): The ISO model that defines the seven layers of activity in a data communications activity.

Operating Expense: An expense a business incurs over the course of its normal operations. Examples include product overhead, employee salaries and electric bill payments. Importantly, operating expenses on a balance sheet reflect only ordinary expenses rather than unexpected, one-time expenses. One subtracts the operating expense from operating revenue to determine the operating profit.

Operations Support System (OSS):

Optical Network Termination (ONT): The device in a PON architecture that terminates the optical network at the customerís premises. In many active architectures, the parallel device is called an AP or an ENT.

Optimal Fiber Allocation Plan (OFAP): In designing a fiber to the premises network, architects must take into consideration the cost of aggregation points vs. the cost of the fiber plant itself. The OFAP describes the balance point where the greatest efficiency in both aggregation and fiber plant is reached.

Orderable: Those addresses for which no manual intervention is required for a service provider to complete placing an order.

Organization for Economic Cooperation and Development (OECD): The mission of the Organization for Economic Co-operation and Development (OECD) is to promote policies that will improve the economic and social well-being of people around the world.
The 30 member countries are: Australia, Austria, Belgium, Canada, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Japan, Korea, Luxembourg, Mexico, the Netherlands, New Zealand, Norway, Poland, Portugal, Slovak Republic, Spain, Sweden, Switzerland, Turkey, the United Kingdom and the United States.

OSI: See Open Systems Interconnect.

OSPN: Open Service Provider Network. See Open Access Network.

OSS: See Operations Support System.

OSS/BSS: Most OSS and BSS systems are so tightly intertwined they are usually referred to as OSS/BSS.

OTT: See Over-the-Top.

Outside Plant (OSP): The outside plant is the physical network that delivers services to the subscribers' homes. Outside plant consists of conduit, fiber, handholes, communications shelters, and other elements.

Outside Plant System of Record: The outside plant system of record is any system used to keep track of the outside plant. OHIvey uses an award winning version of ESRI GIS.

Over-the-Top: Services carried over an Internet connection. For example, OTT video would include video delivered by YouTube, Hulu and TV Everywhere.

Overbuild: The process of deploying a network in an already developed area.

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