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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D

Data Over Cable Service Interface Specification (DOCSIS): An international telecommunications standard that permits the addition of high-speed data transfer to an existing cable TV (CATV) system. It is employed by many cable television operators to provide Internet access over their existing hybrid fiber-coaxial (HFC) infrastructure.

DCS: See Distributed Core Switch.

Dense Wave Division Multiplexing (DWDM): DWDM is a method using a single fiber strand for multiple logical data paths.

Digital Subscriber Line (DSL): A family of technologies that provide digital data transmission over the traditional copper wires of a telephone network. The common DSL technologies used in the US are Asymmetric Digital Subscriber Line (ADSL) and Very High Speed Digital Subscriber Line (VDSL).

Digital Subscriber Line Access Multiplexer (DSLAM): Technology that concentrates or aggregates traffic in DSL networks. Located in the central office or in a remote terminal.

Distributed Core Switch (DCS): The middle tier of OHIvey's cascading aggregation architecture. A DCS serves about 10,000 addresses.

DOCSIS: See Data Over Cable Service Interface Specification.

Download (or downstream): Internet connections have two components - a downstream and upstream. Download refers to the rate at which the user's computer can receive data from the Internet.

Downstream (or download): Internet connections have two components - a downstream and upstream. Downstream refers to the rate at which the user's computer can receive data from the Internet.

Drop Level Infrastructure: Drop level infrastructure - often referred to as a "drop" or "customer drop" is the infrastructure that connects access level infrastructure to the subscriber's premises.

DS-1: A Digital Signal 1 or DS-1 (also known as T1); a T-carrier signaling scheme devised by Bell Labs. DS-1 is a widely used standard in telecommunications in North America and Japan to transmit voice and data between devices. DS-1 is the logical bit pattern used over a physical T1 line; however, the terms DS-1 and T1 are often used interchangeably. Carries approximately 1.544 Mbps.

DS3: A copper digital signal transport with 44.736 Mbps capacity - or 28 T1 lines or 672 voice lines.

DSL: See Digital Subscriber Line.

DSLAM: See digital subscriber line access multiplexer.

Duopoly: A situation in which two companies own all or nearly all of the market for a given type of product or service - that is, a two company monopoly.

DWDM: See Dense Wave Division Multiplexing.

DynamicCity: DynamicCity (www.dynamiccity.com) was an open service provider fiber to the premises network management company. DynamicCity did significant work for the UTOPIA project before PacketFront acquired it in 2007. Many of OHIvey’s staff members have experience with DynamicCity and PacketFront.


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