Glossary - Definitions You Can Use

We don't try to drown you in technical talk. We want to make sure every part of your job is exactly the way you want it. Bookmark this helpful glossary to get definitions for terms that may appear in our proposals or our project documentation.

You will also see the definition for these words or phrases display throughout our website wherever the words or phrases are used in context.

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Absorption Loss of power in an optical fiber, resulting from conversion of optical power into heat and caused principally by impurities, such as transition metals and hydroxyl ions, and also by exposure to nuclear radiation.
Active Device Any device or circuit which introduces gain or uses a source of energy other than that inherent in the signal
Adjustable Attenuator An attenuator in which the level of attenuation is varied with an internal adjustment. Also known as Variable Attenuator.
AXT Alien crosstalk (AXT) is electromagnetic noise that can occur in a cable run alongside other signal-carrying cables. The term "alien" arises from the fact that this form of crosstalk occurs between different cables in a group or bundle, rather than between individual wires or circuits within a single cable
Access point A wireless LAN transceiver that can connect a wired LAN to one or many wireless devices. Access points can also bridge to each other.
Air Blown Fiber (ABF) Small, flexible plastic microduct tubing installed prior to the installation of individual or multiple optical fibers that are blown in through the microduct using compressed air.
Air Monitor A wireless access point used to detect wireless devices within range of itself for the purpose of determining the existence near the network and to monitor their activity.
Advanced Intelligent Network (AIN) A telephone network architecture that adds advanced computer intelligence to the telephone system. AIN supports advanced telecommunications features such as voice recognition.
Alliance for Telecommunications Industry Solutions (ATIS) Trade group for telecommunications carriers, resellers, manufacturers and providers of enhanced services. ATIS is heavily involved in standards issues including interconnection and interoperability issues.
American National Standards Institute (ANSI) An organization that certifies standards developed by a wide variety of industry groups. ANSI does not create standards, but rather consolidates those which have been created by other organizations.
American Standard Code for Information Interchange (ASCII) A code with seven information signals plus one parity check signal, designed for interworking between computers.
American Wire Gauge (AWG) Standard American method of classifying wire diameter: the Brown & Sharpe (B&S) gauge.
Analog Signal A signaling method that uses continuous changes in the amplitude or frequency of a radio transmission to convey information.
Analog Transmission The traditional telephone technology (for voice transmission) in which sound waves (or other data) are converted into electrical impulses of varying strength or amplitude.
Angle The field of view, relative to a standard lens within a 35mm still camera, expressed in degrees, e.g. 30°. Practically, this is the area of a scene that a lens covers or sees; where, the angle of view is determined by the focal length of the lens. A wide-angle lens has a short focal length and covers a wider angle of view-than a normal or telephoto lens with a longer focal length.
Address Resolution Protocol (ARP) This is the protocol used for mapping an Internet Protocol address (IP address) to a physical machine address that is recognizable to the local network. For example, in IP Version 4, the most common level of IP in use today, an address is 32 bits long. In an Ethernet local area network, however, addresses for attached devices are 48 bits long. (The physical machine address is also known as a Media Access Control or MAC address.) A table, usually called the ARP cache, is used to maintain a correlation between each MAC address and its corresponding IP address. ARP provides the protocol rules for making this correlation and providing address conversion in both directions.
Aspect Ratio A ratio of width to height, an aspect ration of 9:16 is used in high-definition television (HDTV).
Asymmetric Digital Subscriber Line (ADSL) A transmission technology that transmits an asymmetric digital signal using one of a variety of line codes as specified in the ANSI standard. ADSL technology enables data transmission over existing copper wiring at data rates several hundred times faster than analog modems, providing for simultaneous delivery of voice, video and data.
Asynchronous Transfer Mode (ATM) Asynchronous Transfer Mode (ATM) Network Service is a form of 'fast packet' switching service for high speed networks which require flexible bandwidth, high-performance transport and switching for connectivity between and among widely distributed customer locations.
Attenuation Loss of volume during transmission, or decrease in the power of a signal, light beam, or light wave. Measured in decibels. Opposite of gain.
Attenuation to Crosstalk Ratio (ACR) The difference between attenuation and crosstalk measured in decibels.
Authentication server This service deter¬mines, from the credentials provided by the supplicant, whether the supplicant is autho¬rized to access the services provided by the authenticator.
Autofocus System by which the camera lens automatically focuses on a selected part of the picture subject.
Automatic Iris A lens controlled by a mechanism coupled to the shutter release in the camera body. The diaphragm closes to any preset value before the shutter opens and returns to the fully open position when the shutter closes.
AXT Alien crosstalk (AXT) is electromagnetic noise that can occur in a cable run alongside other signal-carrying cables. The term "alien" arises from the fact that this form of crosstalk occurs between different cables in a group or bundle, rather than between individual wires or circuits within a single cable
Backbone High-capacity network infrastructure; the part that carries the heaviest traffic. The backbone is also that part of the network that joins LANs together - either inside a building or across a country. LANs are connected to the backbone by bridges and/or routers; the backbone serves as a communications highway for LAN-to-LAN traffic.
Backbone Wiring The physical/electrical interconnections between telecommunications closets and equipment rooms. Cross-connect hardware and cabling in the Main and Intermediate Cross-Connects are considered part of the backbone wiring.
Backplane The high-speed communications line to which individual components are connected.
Balance An indication of signal voltage equality and phase polarity on a conductor pair. Perfect balance occurs when the signals across a twisted-pair are equal in magnitude and opposite in phase with respect to ground.
Balanced Signal Transmission Two voltages, equal and opposite in phase with respect to each other, across the conductors of a twisted-pair (commonly referred to as tip and ring).
Balun Balanced/unbalanced device used when interconnecting balanced circuits with unbalanced circuits, such as coaxial feed cables with balanced antennae.
Bandwidth The difference between the highest and the lowest frequencies of a transmission channel (path for information transmission). Identifies the amount of data that can be sentthrough a given channel. Measured in Hertz (Hz); higher bandwidth numbers mean higher data capacity.
Baseband Transmission scheme in which the entire bandwidth, or data-carrying capacity, of a medium (such as a coaxial cable) is used to carry a single digital pulse, or signal, between multiple users. Because digital signals are not modulated, only one kind of data can be transmitted at a time.
Basic Rate ISDN (BRI) A 2-wire line-side local switching system port that uses the 2B1Q line code at a 160 kilobit per second rate to transport overhead and up to two B channels and one D channel.
Basic Service A telecommunications service limited to local switching and transmission.
Baud A measure of the speed of transmission of data; the number of elements transmitted per second.
Beamsplitter An optical device, such as a partially reflecting mirror, that splits a beam of light into two or more beams and that can be used in fiber optics for directional couplers.
Bearer Channel (B Channel) A 64 kilobits per second channel used for information transfer.
Bend loss A form of increased attenua¬tion in a fiber that results from bending a fiber around a restrictive curvature (a mac¬robend) or from minute distortions in the fiber (microbends).
Bend Radius (Fiber) Radius of curvature that a fiber can bend without breaking. Also see Cable Bend Radius.
BICSI (Building Industry Consulting Service International) BICSI is a non-profit professional association, for the promotion of telecom industry standards.
Bit Abbreviation for binary digit. The smallest element of information in binary system. A “1” or “0” of binary data.
Bit Error Rate (BER) In digital applications, the percentage of bits received in error to the total number of bits received. Usually expressed as a number to the power of 10. For example 10 to the fifth power means that one in every 100,000 bits transmitted will be wrong.
Bit Rate The speed at which digital signals are transmitted, usually expressed in bits per second (bps).
Bonding The permanent joining of metallic parts to form an electrically conductive path that will assure electrical continuity and the capacity to conduct safely any current likely to be imposed on it.
Break Test Access Method of disconnecting a circuit that has been electrically bridged to allow testing on either side of the circuit without disturbing cable terminations. Devices that provide break test access include: disconnect blocks, bridge clips, plug-on protection modules, and plug-on patching devices.
Bridge A device that connects and passes data packets between two network segments.
Bridge Router A device that can provide the functions of a bridge, router or both concurrently. A bridge/router can route one or more protocols, such as TCP/IP and/or XNS, and bridge all other traffic.
Bridged Tap The multiple appearances of the same cable pair or fiber at several distribution points. Also known as parallel connections.
Bridging A means of providing through connections between conductors or pairs that are terminated on connecting blocks. These through connections are commonly provided by means of individual metallic bridging clips or multiple bridging clips that are housed in a plastic insulator.
Broadband A data-transmission scheme in which multiple signals share the bandwidth of a medium such as fiber-optic cable. This allows the transmission of voice, data and video signals over a single medium; for example, cable television uses broadband to deliver dozens of channel signals over a single cable.
Buffer Protective material coating applied to fibers. Stated in microns.
Buffer tube A hard plastic tube, having an inside diameter several times that of a fiber, that holds one or more fibers.
Building Distributor (BD) The international term for intermediate cross-connect. A distributor in which the building backbone cable(s) terminates and at which connections to the campus backbone cable(s) may be made.
Bundled Cable An assembly of two or more cables continuously bound together to form a single unit prior to installation (sometimes referred to as loomed, speed-wrap or whip cable constructions).
Bus Topology A linear configuration where all network devices are placed on a single length of cable. It requires one backbone cable to which all network devices are connected.
Byte A group of eight bits makes a byte. Typically a 16 bit “word” is itself divided up into two bytes for handling. A byte is usually the smallest addressable unit of information in a data store or memory.
Cable Assembly A fixed length of cable with connectors installed on both ends. Sometimes called a patch cord, patch cable or jumper.
Cable Bend Radius The amount of bend that can occur before a cable may sustain damage or increased attenuation.
Cable Entrance Facility The entrance area in a central office for all types of outside plant cables that carry subscriber lines and interoffice transmission facilities.
Cable riser Cable running vertically in a building to serve upper floors.
Cable run A length of installed media, which may include other components along its path.
Cable sheath A covering over the optical fiber or conductor assembly that may include one or more metallic members, strength members, or jackets.
Cabling A combination of cables, wire, cords and connecting hardware used in the telecommunications infrastructure.
Campus Area Network (CAN) A network that provides interconnection in a confined geographic area such as a campus or industrial park. Such networks operate over fairly short distances, and do not require public rights-of-way.
Capacitance The property of a system of conductors and dielectrics that permits the storage of electrically separated changes when potential differences exist between the conductors.
Category (1) ANSI/TIA/EIA-568-B series of documents, the North American standards for cabling describes mechanical properties and transmission characteristics of unshielded twisted-pair (UTP) cables and screened twisted-pair (ScTP) cables and assigns a unique number classification (category 3, category 5e, and category 6).
Category (2) ISO/IEC IS 11801 2nd edition, the international standard for cabling and local standardization documents define cabling component categories based on transmission performance parameters such as attenuation and NEXT loss, over a specified frequency range. Component categories category 5, category 6 and category 7.
Category 3 CAT 3 A category of performance for inside wire and cable systems. Commonly used for voice applications and data to 10Mbps. Defined by FCC Part 68, ANSI/EIA/TIA-568, TIA TSB-36 and TIA TSB-40.
Category 5 CAT 5 A category of performance for inside wire and cable systems. Used in support of voice and data applications requiring a carrier frequency of up to 100 MHz. Defined by FCC Part 68, EIA/TIA-568, TIA TSB-36 and TIA TSB-40.
Category 5e (Enhanced) CAT5e A category of performance for inside wire and cable. Used in support of signalling rates of up to 100MHz over distances of up to 100 meters. Calls for tighter twists, electrical balancing between pairs and fewer cable anomalies. CAT 5e is intended to support 100Base-T, ATM and Gigabit Ethernet.
Category 6 CAT 6 A cable standard for Unshielded Twisted Pair (UTP) supporting signaling rates up to 250 MHz. Applications include 1000Base-T, ATM, Gigabit Ethernet and applications under development.
Category 6A (Augmented Category 6 or CAT6A) Also referred to as 10G or 10Gigabit Ethernet. A cable standard for Unshielded Twisted Pair (UTP) supporting signaling rates up to 500 MHz. Applications include 10GBase-T, ATM, 10 Gigabit Ethernet, VoIP, and applications under development.
Category of Performance Cabling and cabling component standard adopted by the telecommunications industry.
Charge Coupled Device (CCD) The light-sensitive image device within most modern cameras, this is a large-scale integrated circuit containing hundreds of thousands of photo-sites (pixels) that convert light energy into electronic signals. Its size is measured diagonally and can be 1/4", 1/3", 1/2" or 2/3". CCD stands for Charge Coupled Device, which is the new age imaging device, replacing the old image tube. When first invented in the 1970s, it was initially intended to be used as a memory device. Most often used in cameras, but also in Telephone, fax machines, scanners, etc.
CCTV Closed Circuit Television, also known by the acronym CCTV, is a private video system within a building (or complex) used to visually monitor a location for security or industrial purposes. A CCTV system can be recorded and viewed on-site or viewed remotely through the use of telephone lines.
CDDI Copper Data Distributed Interface is the term used for a copper cable on which a high speed 100 Mbs data is run. Sometimes called FDDI over fiber cable.
Cell Relay Network transmission format that uses small data packets of the same size, called cells. The cells are fixed length, and can be transmitted at very high rates.
Center wavelength The nominal value central operation wavelength. It is the wavelength defined by a peak mode measurement where the effective optical power resides.
Central member The center component of a cable. It serves as an anti-buckling element to resist temperature-induced stresses. Sometimes serves as a strength element. The central member is composed of steel, fiberglass, or plastic.
Central Office Distribution Frame The primary point at which outside plant facilities terminate within a wire center for interconnection to other telecommunications facilities within the wire center. Also known as Main Distribution Frame (MDF).
Channel An electrical or photonic (for fiber optic-based systems) communication path between two or more points of termination.
Chromatic dispersion Spreading of a light pulse caused by the difference in refractive indices at different wavelengths.
CIF CIF (Common Intermediate Format) refers to video resolution 352 x 288 pixels (PAL) and 352 x 240 pixels (NTSC).
Circuit A two-way communication path.
Circuit Switching Switching system in which a dedicated physical circuit path exists between sender and receiver for the duration of the call. Used heavily in service provider company networks, circuit switching is often contrasted with contention and token passing as a channel-access method, and with message switching and packet switching as a switching technique.
Cladding The transparent material, usually glass, that surrounds the core of an optical fiber, causing any dispersed light to be reflected back into the central core, thereby helping to maintain signal strength over long distances.
Classification Application classes for cabling have been identified for the purpose of the ISO/IEC 11801 standard; • Class A: cabling is characterized up to 100 kHz • Class B: cabling is characterized up to 1 MHz • Class C: cabling is characterized up to 16 MHz • Class D: cabling is characterized up to 100 MHz • Class E: cabling is characterized up to 250 MHz • Class F: cabling is characterized up to 600 MHz • Optical Class: optical fiber links are characterized from 10 MHz and above.
Cleaving To cut the end of fiber at 90 degrees with as few rough edges as possible before a fiber termination.
Central Office (CO) Telephone company facility where subscribers’ lines are joined to switching equipment for connection to each other, locally and long distance. Sometimes the same as the overseas term “public exchange”.
Coating A material put on a fiber during the drawing process to protect it from the environment.
Coaxial Cable A transmission line in which one conductor is a wire at the center of the cable; the other conductor surrounds the center wire with a layer of insulating material between them. Coaxial cable can transmit greater bandwidth than twisted pair (TP) wires.
Collapsed Backbone A non-distributed backbone in which all network segments are interconnected via an internetworking device. A collapsed backbone may be a virtual network segment that exists in a device such as a hub, a router, or a switch.
Collocation An arrangement whereby the facilities of one party (the Collocating Party) are terminated with the equipment necessary to provide interconnection or access to the network elements offered by the second Party. This equipment is installed and maintained at the premises of the second Party (the Housing Party). All such services and facilities used for Collocated Interconnection are for carriage of non-switched interstate traffic. For purposes of Collocation, the premises of a Housing Party are described as a Housing Party Wire Center, other mutually agreed-upon locations of the Housing Party, or any other location for which Collocation has been ordered by the FCC or the state Commission. Collocation may be physical or virtual. For physical collocation, the Collocating Party installs and maintains its own equipment in the Housing Party's premises. For virtual collocation, the Housing Party owns, installs, and maintains equipment that is purchased by the Collocating Party, located in the Housing Party's premises, and dedicated to use by the Collocating Party.
Common Carrier A telecommunications company that provides communication transmission services, such as telephone and telegraph, to the public. The local telephone service provider is an example of a common carrier.
Common Mode Transmission A transmission scheme where voltages appear equal in magnitude and phase across a conductor pair with respect to ground. May also be referred to as longitudinal mode.
Communication network An organization of stations capable of intercommunication, but not necessarily on the same channel.
Communications system A collection of individual communications networks, transmission systems, relay stations, tributary stations, and terminal equipment capable of interconnection and inter-operation to form an integral whole. These individual components must serve a common purpose, be technically compatible, employ common procedures, respond to some form of control, and, in general, operate in unison.
Community Antenna Television (CATV) A service through which subscribers pay to have local television stations and additional programs brought into their homes from an antenna via a coaxial cable.
Compliance A wiring device that meets all characteristics of a standard is said to be in compliance with that standard.
Computer peripherals The auxiliary devices under control of a central computer, such as card punches and readers, high speed printers, magnetic tape units, and optical character readers.
Concatenation A mechanism for allocating very large amounts of bandwidth for transport of a payload associated with a 'superrate service', which is a service at a transmission rate greater than the normal maximum rate of OC-1. The set of bits in the payload is treated as a single entity, as opposed to being treated as separate bits or bytes or time slots. The payload, therefore, is accepted, multiplexed, switched, transported and delivered as a single, contiguous chunk of payload data.
Conditioning The adjustment of the electrical characteristics of transmission lines to improve their performance for specific uses. Conditioning involves the tuning of the line or addition/deletion of equipment to improve its transmission characteristics.
Conductor Any substance, usually a wire or cable, that can carry an electrical current.
Congestion Excessive network traffic.
Congestion Control Network management effort to control traffic flow so that switches and end-stations are not overwhelmed with information because of excessive network traffic.
Connecting Block Also called a terminal block, punch-down block, quick-connect block, or cross-connect block, this plastic block contains metal wiring terminals to establish connections from one group of wires to another. Usually each wire can be connected to several other wires in a bus or common arrangement. There are several types of connecting blocks: 66 clip, BIX, Krone, 110, etc. A connecting block has insulation displacement connections (IDCs), which means you don’t have to remove insulation from around the wire conductor before you “punch it down” (terminate it).
Connector A device that connects wires or fibers in cable to equipment or other wires or fibers. Wire and optical connectors most often join transmission media to equipment or cross connects. Connectors are sometimes referred to as jacks, but though all jacks are connectors, not all connectors are jacks.
Consolidation Point (CP) A location for interconnection between horizontal cables that extend from building pathways and horizontal cables that extend into work area pathways.
Constant Bit Rate (CBR) Delay-intensive applications such as video and voice, that must be digitized and represented by a continuous bit stream. CBR traffic requires guaranteed levels of service and throughput.
Controller A unit that controls input/output for one or more devices.
Control Unit If a CCTV system has more than one camera, there must be a way to control each video signal going to the VCR and the monitor. There are three basic types of Video Control Units, Multiplexor, Switch and Quad.
Core The central light-carrying part of an optical fiber; it has an index of refraction higher than that of the surrounding cladding.
Cross-connect Distribution system equipment used to terminate and administer communication circuits. In a wire cross-connect, jumper wires or patch cords are used to make circuit connections. In an optical cross-connect, fiber patch cords are used. The cross-connect is located in an equipment room, riser closet, or satellite closet.
Cross-connection A connection scheme between cabling runs, subsystems and equipment using patch cords or jumpers that attach to connecting hardware on each end.
Crosstalk Noise or interference caused by electromagnetic coupling from one signal path to another. Crosstalk performance is generally expressed in decibels.
Cutover Physical changing of lines from one system to another, usually at the time of a new system installation.
D Channel The D channel is a packet-switched channel that carries signaling and control for B channels. In Basic Rate ISDN (BRI) applications, it can also support customer packet data traffic at speeds up to 9.6 kilobits per second.
Daisy Chain In telecommunications, a wiring method where each telephone jack in a building is wired in series from the previous jack. Daisy chain is NOT the preferred wiring method, since a break in the wiring would disable all jacks “downstream” from the break. See also Home Run
Data Center A data center is a facility used for housing a large amount of electronic equipment, typically servers, computers, and communications equipment. Data centers are designed to assure that the servers and the data housed on them are protected from environmental hazards and security breaches. Data centers can be private, serving a single company or a public “utility” serving a variety of companies.
Data communication The movement of encoded information by means of electric transmission systems via one or more data links according to a protocol.
Data concentrator A unit that permits a common transmission medium to serve more data sources than there are channels currently available.
Data Communication Equipment (DCE) Devices and connections, such as printers or modems, of a communications network; connect the communication circuit between the data source and destination.
Data Local Exchange Carrier (DLEC) A carrier that primarily transports data with no voice grade services.
Data Service Unit or Digital Service Unit (DSU) Device that connects data terminal equipment (such as a personal computer or a LAN) to a digital telephone line to allow fully digital communications; in effect, the digital equivalent of a modem.
Data Terminal Equipment (DTE) Equipment/digital end instruments that convert user information into data signals for transmission, or reconvert the received data signals into user information.
Data transmission The sending of data from one place to another by means of signals over a channel.
Decibel (dB) The logarithmic unit of signal power ratio most commonly used in telephony. It is used to express the relationship between two signal powers, usually between two acoustic, electric, or optical signals.
Dedicated LAN Network segment allocated to a single device. Used in LAN switched network topologies.
Dedicated Line A communications circuit or channel provided for the exclusive use of a particular subscriber. Dedicated lines are used for computers when large amounts of data need to be moved between points. Also known as a private line.
Delay Skew The difference in propagation delay between the fastest and slowest pair in a cable or cabling system.
Demarcation Point The point of interconnection between telephone company terminal equipment and your building wiring. The protective apparatus or wiring at a subscriber’s premises.
DHCP DHCP (Dynamic Host Configuration Protocol) is a protocol that lets network administrators automate and centrally manage the assignment of Internet Protocol (IP) addresses in an organization's network. Using the Internet's set of protocols (TCP/IP), each machine that connects to the Internet needs a unique IP address. When an organization sets up its computer users with a connection to the Internet, an IP address must be assigned to each machine. Without DHCP, the IP address must be entered manually at each computer and, if computers move to another location in another part of the network, a new IP address must be entered.
Dielectric Nonmetallic and, therefore, nonconductive. Glass fibers are considered dielectric. A dielectric cable contains no metallic components.
Differential Mode Transmission A transmission scheme where voltages appear equal in magnitude and opposite in phase across a twisted-pair with respect to ground. May also be referred to as balanced mode.
Digital or Digitized Any type of information that can be output, transmitted and interpreted as individual bits of binary information (the use of the numbers 0 and 1), using electrical or electronmagnetic signals that can be modulated to convey their specific content.
Digital Signal 0 (DS0) A Special Access Service offering a 64 Kbps high-bandwidth dedicated circuit, that delivers quality that typically can't be duplicated with unconditioned analog circuits.
Digital Signal 1 (DS1) A Special Access Service that provides virtually error-free voice, video and data transmission at speeds up to 1.544 Mbps.
Digital Signal 3 (DS3) A Special Access Service comparable to having 672 voice-grade channels capable of handling multiple data streams in high volume at speeds up to 44.736 Mbps (commonly referred to as a 45 Megabit channel).
Digital Subscriber Line (DSL) A generic name for a group of enhanced speed digital services provided by telephone service providers. DSL services run on twisted-pair wires; they carry both voice and data.
Digital Switch A computer that electronically switches digitally encoded messages through the telephone network. Operates faster, more efficiently and more flexibly than an analog switch.
DIGITAL TELEVISION (DTV) A new technology for transmitting and receiving broadcast television signals. DTV provides clearer resolution and improved sound quality.
Digital Transmission A mode of transmission in which all information is transmitted in digital form as a serial stream of pulses. Sound waves and other information are converted into binary computer code (a series of 0s and 1s) and transmitted to the end point. At the end point, binary code is converted back into the original format. Digital transmission provides sharper, clearer, faster transmission than analog transmission.
Digital System Cross-Connect (DSX) Panel or Frame A bay or panel to which high-speed lines such as T-1 lines are attached. Used in small office applications where only a few digital trunks are installed, a DSX permits cross connections.
Dispersion A general term for those phenomena that cause a broadening or spreading of light as it propagates through an optical fiber. The three types are modal, material and waveguide.
Distribution duct A raceway of rectangular cross-section placed within or just below the finished floor and used to extend the wires or cables to a specific work station/area.
Distribution network Part of the local exchange cable network, comprising small cables between subscribers’ distribution points (DPs) and cabinets, remote line units (RLUs) or other flexibility points.
Distribution panel A rack mounted patch panel that terminates horizontal cabling from workstations.
Duct -1 A single enclosed raceway for wires or cables. See also raceway; 2. A single enclosed raceway for wires or cables usually used in soil or concrete; 3. An enclosure in which air is moved. Generally part of the HVAC system of a building.
DNS The domain name system (DNS) is the way that Internet domain names are located and translated into IP (Internet Protocol) addresses. A domain name is a meaningful and easy-to-remember "handle" for an Internet address.
Duplex Allowing communication in opposite directions simultaneously as in duplex telephony. Also a duplex receptacle wallplate, meaning it contains 2 outlets.
Duplex cable A two-fiber cable suitable for duplex transmission.
Duplex transmission Transmission in both directions, either one direction at a time (half duplex) or both directions simultaneously (full duplex).
Electronic Industries Alliance (EIA) A trade organization of manufacturers which set standards for use of its member companies. Many associations fall under the umbrella of EIA, though it has recently been absorbed by the TIA, or Telecommunications Industry Association.
EIA/TIA Electronics Industry Association/Telecommunications Industry Association
Electromagnetic Interference (EMI) The interference in signal transmission or reception caused by the radiation of electrical and magnetic fields.
Electromagnetic Compatibility (EMC) The ability of a system to minimize radiated emissions and maximize immunity from external noise sources.
Electromagnetic Interference (EMI) The interference in signal transmission or reception caused by the radiation of electrical and magnetic fields.
Electronic Commerce A set of services which enable the secure exchange of electronic funds via the internet. Generally, E-Commerce is referred to in relation to websites that promote products and services for immediate sale.
Electronic Data Interchange (EDI) Industry standard method of electronically exchanging data such as orders, invoices, etc. between two different locations or organizations.
Email (or E-Mail) An abbreviation for electronic mail, which is a network service that allows users to send and receive messages via computer. The Internet and common message protocols makes it possible to send and receive email messages worldwide.
EMI segregation Isolation of the telecommunications signal from electromagnetic interference.
Encryption key An alphanumeric (letters and/or numbers) series that enables data to be encrypted and then decrypted so it can be safely shared among members of a network. WEP uses an encryption key that automatically encrypts outgoing wireless data. On the receiving side, the same encryption key enables the computer to automatically decrypt the information so it can be read.
Enterprise Network A geographically dispersed network under the auspices of one organization.
Entrance Facility An entrance to a building for both public and private network service cables (including antennae), including the entrance point at the building wall and continuing to the entrance room or space. Entrance facilities are often used to house electrical protection equipment and connecting hardware for the transition between outdoor and indoor cable.
Entrance point (telecommunications) The point of emergence for telecommunications cabling through an exterior wall, a floor, or from a conduit.
Epoxy Connector A type of fiber optic connector that requires a chemical bond, or epoxy.
Equal Level Far-end Crosstalk (ELFEXT) Crosstalk measured at the opposite end from which the disturbing signal is transmitted, normalized by the attenuation contribution of the cable or cabling.
Equipment Cable A cable or cable assembly used to connect telecommunications equipment to horizontal or backbone cabling.
Equipment Room (ER) An Equipment Room is a centralized space that houses telecommunications equipment. ERs are generally considered to serve an entire building or campus, while TRs serve one floor of a building or a portion of a floor. An ER may contain active equipment, cross-connect facilities and building facilities (e.g. life safety, security, electrical and HVAC).
ESSID The identifying name of an 802.11 wireless network. When you specify your correct ESSID in your client setup you ensure that you connect to your wireless network rather than another network in range. (See SSID.) The ESSID can be called by different terms, such as Network Name, Preferred Network, SSID or Wireless LAN Service Area.
Ethernet Ethernet is the most widely installed local area network technology. Now specified in a standard, IEEE 802.3, Ethernet was originally developed by Xerox and then developed further by Xerox, DEC, and Intel. An Ethernet LAN typically uses coaxial cable or special grades of twisted pair wires. The most commonly installed Ethernet systems are called 10BASE-T and provide transmission speeds up to 10 Mbps. Devices are connected to the cable and compete for access using a Carrier Sense Multiple Access with Collision Detection (CSMA/CD) protocol.
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