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| 1000Base-T | A recent LAN standard for implementing 1000Mbps Ethernet on Catgeory 5 cable. (See also Gigabit Ethernet.) |
| 100Base-T | The twisted pair version of 100Mbps Ethernet. Requires Category 5 cabling. |
| 10Base-2 | Also called Thinnet. 10Mbps Ethernet on thin (RG58) coaxial cable. |
| 10Base-5 | Also called Thicknet. 10Mbps Ethernet on thick coaxial cable. |
| 10Base-T | 10 Mbps Ethernet on standard unshielded twisted pair cable specification. 10Base-T supports network configurations using the CSMA/CD access method over a twisted pair transmission system up to 100 meters without the use of a repeater. |
| 110 Connector | A popular insulation displacement connector (IDC) used in modular jacks, patch panels and cross-connects. |
| 66 Block | A legacy cross-connect system. Similar in function to AMP 110Connect XC. |
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| Absorption | Fiber Optic term - One cause of attenuation where light signal is absorbed into the glass during transmission. |
| AC (Alternating Current) | Current in which the charge-flow periodically reverses and is represented by the current, amplitude, frequencey and the phase angle. |
| ACR (Attenuation-crosstalk ratio) | The value of attenuation,less the crosstalk value, both expressed in dB, at a particular frequency. A quality factor for cabling that expresses the relation of two important measured values. |
| Adapter | A device used to interconnect two different connector types. A device that enables any or all of the following: (a) different sizes or types of plugs to mate with one another or to fit into a telecommunications outlet or connector; (b) the re-arrangement of leads; (c) large cables with numerous wires to fan out into smaller grouups of wires; (d) interconnection between cables. |
| Admittance | The measure of the ease with which an alternating current flows in a circuit. The reciprocal of impedance. |
| Aerial Cable | A cable suspended in the air on poles or other overhead structure. |
| Air Core Cable | A cable in which the interstices in the cable core are not filled with a moisture barrier. |
| Air-Handling Plenum | A designated area, closed or open, used for environmental air. |
| American Wire Gauge (AWG) | The standard system used for designating wire diameter. The lower the AWG number, the larger the diameter. Also called the Brown and Sharpe wire gauges. |
| Amperer | The unit of current. One ampere is the current flowing through one ohm of resistance at one volt potential. |
| Amplifier | A component that boosts the strength of a transmitted analog signal as measured in decibels; an amplifier is similar to a repeater in digital systems. |
| Amplitude | The maximum value of a signal. |
| Analog | A signaling format that uses continuous physical variables such as voltage amplitude or frequency variations to transmit information. |
| Anomaly | An impedance discontinuity on a transmission cable. The discontinuity causes an undesired signal reflection that may distort signals and disrupt a network connection. Anomalies are often caused by distortions in cable geometry that do not affect the dc continuity of the cable. |
| ANSI | American National Standards Institute |
| ANSI | American National Standards Institute. |
| AppleTalk | Apple Computer's networking scheme, integrated into most Apple system software, that allows Apple computing systems to participate in peer to peer computer networks and to also access the services of AppleTalk servers. See also LocalTalk. |
| Approved Ground | A building ground or bonded connection to building ground that meets the requirements specified in the NEC. |
| ARCNET | Attached Resource Computer Network. A token bus local area network standard developed by Datapoint Corporation. An RF signal is used to pass a token between stations connected in a bus or star. Star arrangements may use passive or active hubs for signal distribution. ARCNET can use a variety of cabling types, including coax, twisted pair, and fiber optic cable. Standard ARCNET operates at 25 Mbps. |
| ATM | Asynchronous Transfer Mode. A transport protocol based on fast switching of 53-byte cells. With its high-speed operation, fast switching, and guaranteed delay times, ATM can transmit voice, data, and video efficiently along the same transmission path. Conventional data access methods, such as Ethernet and Token-Ring, are supported by LAN Emulation (LANE) in order to compensate for their longer packet lengths. ATM is implemented on a variety of transmission media and at a variety of speeds. It may be used for both backbone and primary workstation connections. |
| Attenuation (Insertion Loss) | The amount of signal lost as it travels through the cabling system. The decrease in magnitude of the power of a signal in transmission between points. Attenuation is usually measured in decibels dB per unit length at a specific frequency (ex. 31.0 dB/100Ft.) Attuation increases as frequency increases. |
| Attenuation to Crosstalk Ratio | The difference between attenuation and crosstalk, measured in dB, at a given frequency. Important characteristic in networking transmission to assure that signal sent down a twisted pair is stronger at the receiving end, after being attenuated, than are any interference signals imposed on the same pair by crosstalk from other pairs, represented by NEXT. |
| Attenuator | A device used to reduce the power of an optical signal. |
| Audio Frequency | The range of frequencies within the range of human hearing. This range is generally given as 20 to 20,000 Hz, although few humans can detect sounds below 30 Hz or above 16,000 Hz. |
| AWG | American Wire Gauge (AWG). The standard system used for designating wire diameter. The lower the AWG number, the larger the diameter. Also called the Brown and Sharpe wire gauges. |
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| Back Reflection | A measure of the light reflected off the polished end of a fiber connector. Measured in negative dB relative to incident power. |
| Backbone Wiring | The cabling used between floors in a building or between telecommunications closets, entrance facilities, equipment rooms or buildings. |
| Balanced Line | A cable having two identical conductors which carry voltages opposite in polarity and equal in magnitude with respect to ground. |
| Balun | A transformer used to attach coaxial or twinaxial equipment to twisted pair cabling. |
| Balun | A device for matching an unbalanced coaxial transmission line to a balanced two-wire system. |
| Band Marking | A continuous circumferential band applied to a conductor at regular intervals for identification. |
| Bandwidth | A continuous range of signal frequencies extending between two limiting frequencies. Also referred to as a frequency band. |
| Baseband | In data transmission, the use of a dedicated end-to-end connection to carry a single channel only. |
| Basic Link | The portion of a structured wiring cable connection between the cable termination at the horizontal cross-connect and the work area outlet connector, including the test cables and excluding the test connector. (See Channel, Permanent Link.) |
| Bits per second (Bps) | A unit of communications speed measured in the number of bits passed in one second. Kbps stands for thousands of bits per second. Mbps is for million bits per second. |
| BNC | A coaxial connector that uses a "bayonet" style turn and lock mating method. Used with RG-58 or smaller coaxial cable. Used with 10Base2 Ethernet thin coaxial cable. BNC is an acronym for Bayonet-Neill-Concelman. |
| BNC | A bayonet-style coaxial connector. |
| Buffer | Fiber Optic term - The protective coating over the fiber. |
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| Cable | Networks require a special kind of cable, called UTP, which looks like ordinary telephone wire from the outside. Several categories are available, including CAT5, CAT5-E and CAT6. |
| Cabling | The part of the telecommunications infrastructure comprised of cables, wire, cords and connecting hardware. |
| Category 5 | The standard unshielded twisted pair cabling used for LAN drops. |
| Category 5e, Cat 5e, Enhanced Cat 5 | Category 5e is a new standard that will specify transmission performance that exceeds Cat 5. Cat 5e has improved specifications for NEXT, PSELFEXT, and Attenuation. Like Cat 5, it consists of unshielded twisted pair with 100 ohm impedance and electrical characteristics supporting transmission at frequencies up to 100 MHz. To be defined in the TIA 568-A-5 update. |
| Category 5E/6 | The standard unshielded twisted pair cabling used for LAN drops. |
| Center Conductor | The solid or stranded wire in the middle of coaxial cable which is responsible for transmitting the cable's signal. The conductor diameter is measured by the American Wire Gauge (AWG). |
| Channel | The entire path connecting any two points where specific application equipment is joined. The physical equipment and cabling at the work area is all part of the channel. |
| Coax, Coaxial Cable | Coax cable is defined as any cable with the following properties: (1) A center copper conductor; (2) Insulation covering the center conductor, called a dielectric; (3) A braided copper shield surrounding the dielectric; (4) An optional foil shield; (5) An outer jacket. Coaxial cables have a wide bandwidth and can carry many data, voice and video conversations simultaneously. |
| Coaxial Adapter | A device used to change one connector type to another, or one gender to another (ie, BNC to SMA Adapter). |
| Coaxial Connector | The interconnection device found at each end of a coaxial cable assembly. There are many common types of coaxial connectors, such as: BNC, SMA, SMB, F, etc. |
| Component | This method of video signal transmission uses 3 coaxial lines with RCA style connectors. Black and white information is carried on one coaxial line while color differential signals are carried on the two remaining coaxial lines. This method produces a very high quality video image. |
| Composite | This method of video signal transmission uses a single coaxial line with an RCA connector which carries both the black and white as well as the color signal. This method of video signal transmission produces a relatively good quality video image. |
| Conduit | Circular raceway that cable is run inside. Conduit requirements are specified under appropriate electrical code. |
| Coupler | A device used to connect two similar connector types. |
| Cross-Connect | The connection method used between permanent cabling (inside the walls) and equipment. A patch cord is often used as the connection means. |
| Crosstalk | Generally expressed in decibels, the measured noise or interference effected by electromagnetic coupling from one path of signal to another. |
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| D Connector | See Subminiature D Connector. |
| Data Cabling | A term that includes a wide range of computer cables, such as networking, serial, SCSI, USB, and phone cords. Generally speaking, data cables all have a similar construction which is comprised of one or more insulated copper wires, surrounded by a PVC jacket, with some sort of connector attached at each end. The signal travels through the wires inside in the form of a low-voltage electrical current. An aluminum foil shield is often wrapped around the wires inside the jacket to prevent outside EMI interference. |
| dB | Abbreviation for decibel. The logarithmic ratio of two powers, voltages or currents. |
| DB-9 | Nine pin D connector. |
| Demarcation Point | The point at which operatonal control changes (for example, where the phone company's responsibility ends and the building owner's begins). |
| Dielectric | The dielectric insulator's purpose is two-fold: (1) It acts as an insulator between the center conductor and the outer copper/foil shielding. (2) It helps physically hold the center conductor in the center of the cable. |
| Drop | Slang term used for each cabling span pulled from a telecommunications closet. |
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| ELFEXT (Equal Level Far-end Cross talk) | Measured cross talk levels at the opposite end from the signal distribution point where signal is transmitted normalized by the contributed attenuation of the cabling. |
| EMI - Electromagnetic Interference | Electrical or electro-magnetic energy that disrupts electrical signals. |
| Equipment Room | The space dedicated to telecommunications equipment. |
| Ethernet | The most popular standard for connecting computers into a local area network (LAN). 10BaseT is the most common form of Ethernet and denotes a peak transmission speed of 10Mbps using copper twisted-pair cable. Based originially on a bus topology. |
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| F Connector | A common coaxial connector used for video applications (CATV). |
| FEXT (Far end Cross talk) | Measured cross talk levels at the opposite end from the distribution point where signal is transmitted. |
| Frequency | The number of times a periodic action occurs in one second. Measured in Hertz. |
| Fusion Splice | A permanent splice where the two fiber optic ends are welded together. |
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| Gain | A measure of amplification expressed in dB. |
| Gbps | A data rate. Gigabits per second. A gigabit is one billion bits. |
| Gibahertz (GHz) | One billion cycles per second. Signals operating above 3 Gigahertz are known as microwave. |
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| Horizontal Wiring | The span of cabling and connectors between the Wiring Closet and each drop. It is called "horizontal" because this type of wiring does not go up or down any floors of a building. |
| Hub | Network device, usually in the telecom closet, that stations connect to. This device sits at the center of a typical network where traffic enters and leaves from different directions. They simplify network setup, because adding a new computer requires little more than connecting the computer to a cable (via the NIC) and plugging the other end into the hub. |
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| IDC Insulation Displacement Contact | A means of terminating wires without the need of stripping down to the bare wire. |
| IEEE-802.3 | Usually referred to as Ethernet. A networking protocol. |
| IEEE-802.5 | Usually referred to as Token Ring. fe |
| Impedance | The total opposition to the flow of alternating current in a conductor. Measurered in Ohms. Two common impedance values are 50 Ohms used primarily for data, and 75 Ohms used to transmit video signals. |
| Insertion Loss | The attenuation caused by the insertion of a device (such as a splice or connection point) to a cable. |
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| Jack | The female connector/female receptacle - usually found on equipment. |
| Jumper | Single twisted pairs used for cross connecting between 66, 110, or Krone blocks. |
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| Kbps | A data rate. Kilobits, or thousands of bits, per second. |
| KVM Extender | A KVM (Keyboard, Video, Mouse) Extender allows you to send the Keyboard, Monitor, and Mouse signal over a long distance using CAT5 or Fiber. This can be for a single computer, or can be connected to a KVM Switch to control multiple computers. |
| KVM Switch | KVM stands for "Keyboard, Video and Mouse." A KVM switch allows you to control multiple computers from a single console (Keyboard, Video monitor and mouse). By using a KVM switch, you'll save money on redundant hardware and conserve desk space. Multiple-user KVMs will allow more than one person to access connected computers at once. A KVMP switch adds peripheral sharing capabilities allowing you to share peripherals (printers, scanners, etc.) between multiple computers. |
| KVMP Switch | KVMP stands for "Keyboard, Video, Mouse, Peripherals" A KVMP switch adds peripheral sharing capabilites, allowing you to share peripherals (printers, scanners, etc.) between multiple computers. |
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| LAN | A local area network. Usually refers to a network in a single building or campus (as opposed to WAN, or wide-area network, with farther reaching connectivity). |
| Link | End-to-end transmission path supported by the cabling infrastructure. Links include all hardware and supporting cabling that makes up the backbone/horizontal subsystems. The entire span between two optical devices. |
| Loss Budget | The maximum amount of power that is allowed to be lost per optical link. |
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| Mandrel | A fiber wrapping device used to cause attenuation within a fiber cable. |
| Mbps | A data rate. Megabits, or millions of bits, per second. |
| Mechanical Splice | A mechanical means of connecting two fibers. |
| Modem | A modem (modulator/demodulator) is an electronic device which converts digital computer data into an analog signal that can be transmitted over conventional telephone lines. Another modem then translates that signal back into computer data at the receiving end. |
| Modular Jack | The female connector used at the end of each horizontal cabling drop. Usually Modular Jacks utilize a 6- or 8-contact modular plug (on the patching side) and a 110, Krone, or other Insulation Displacement connection method (on the permanent horizontal wiring side). A "telephone jack" |
| Modular Plug | Having either 4, 6 or 8 contacts, a male type Telecommunications interface connector. The standard male connector for twisted pair cable, usually found at the end of a patch cord. A "telephone plug." |
| MSAU - Multistation Access Unit | A concentrator or transceiver for connecting nodes to a transmission medium. |
| MT-RJ | A small form factor, dual fiber connector. |
| Multimedia | Communications of information by more than one type of cabling media, ie, CATV, Satellite, Video... |
| Multimode | A type of fiber optic cable where the core diameter is much larger than the wavelength of light transmitted. Two common multimode fiber types are 50/125 and 62.5/125. |
| Multimode Fibers | Optical fibers that have a large core (25 to 300 um) and that permit nonaxial rays or modes to propagate through the core. 62.5/125 mc is the common standard core for premises distribution systems. |
| Multiplexer (MUX) | A MUX alternates the access of several data communication devices to a single communication line, such that the line is shared among the devices, but each functions as if it had sole access to the line. |
| Multiplexing | The process of combining multiple signals, usually by time-division multiplexing (TDM) on a high frequency carrier, to optimize the use of available transmission media. |
| Multistation Access Unit (MSAU) | A concentrator or transceiver for connecting nodes to a transmission medium. |
| Multiuser Outlet | A telecommunications outlet used to serve more than one work area, typically in open-system furniture applications. |
| MUTOA | Multi-User Telecomunications Outlet Assembly. One location serving several telecommunications outlet connections. |
| MUX - Multiplexer | A MUX alternates the access of several data communication devices to a single communication line, such that the line is shared among the devices, but each functions as if it had sole access to the line. |
| Mylar | DuPont trademark for polyethylene terephtalete (polyester) film. |
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| Network | Computers, printers, and other electronic devices linked with cable so all the pieces can talk and work together. |
| Network Interface Card (NIC) | A board installed into one of the internal bus slots of a PC or laptop to provide network communication capabilities to and from that computer system. |
| NEXT (Near End Cross Talk) | Measurement of cross talk taken at the end from where the signal is transmitted. |
| NIC | Network Interface Card. Allows a PC to attach to a network. A board installed into one of the internal bus slots of a PC or laptop to provide network communication capabilities to and from that computer system. |
| Node | A device connected to a network. |
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| Outlet | Where the horizontal cabling terminates in the work area. |
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| Parallel | Parallel and serial are two different communications modes. Serial data is transmitted in single bits, one by one. Parallel data is transmitted in multiple bits and at the same time. Most printers today are parallel printers and print much faster than a serial printer. Most computers come with both a serial port (usually a DB9 male and/or DB25 male) and a parallel port (usually a DB25 female). Serial ports are sometimes labeled COM1, COM2, etc. and parallel ports are sometimes labeled LPT1, LPT2, etc. A serial port and a parallel port cannot communicate with each other. To connect two computers via serial ports, you would need a serial null-modem cable. To connect two computers via parallel ports (printer ports), you would need a parallel data transfer cable with DB25 male connectors. |
| Parallel Circuit | A circuit in which the identical voltage is presented to all components, with current dividing among the components according to the resistance or the impedance of the components. Side by side versus end to end. |
| Parallel Transmission | A method of transmission in which all bits of a character are sent simultaneously over separate lines to a high-speed printer or other locally attached peripheral. Contrast with Serial Transmission. |
| PASP | Polyethylene-aluminum-steel-polyethylene, the preferred sheath for protection of cable against damage by lightning, mechanical means, or rodents. |
| Passive Device | A component of the broadband system which is not supplied with activating power. |
| Patch Cable | A cable assembly with modular plugs on each end. Used for patching equipment to the patch panel in equipment room, and also used to connect from the wallplate to the computer at the drop location. |
| Patch Panel | The common cross-connect method used inside an equipment room. Typically, Patch Panels utilize 110 connectors (on the back of the panel) to connect to the horizontal cabling, and modular jacks (on the front) to connect to equipment via patch cords. |
| Patching | Connecting circuits by means of cords with plugs inserted into appropriate jacks. |
| PBX | Private Branch Exchange. The premises telephone switch. Handles telecom functions. |
| PCE | Pole mount cable enclosure. |
| Peak | The maximum instanteous value of a varying current or voltage. |
| Plug | The male connector- typically found on the end of a patch cord. |
| Power Sum | 4-pair cable testing where the mathematical sum of pair-to-pair cross talk generated by 3 pairs to 1 pair is measured. |
| Premise Wiring | Premise Wiring is the cabling, connectors, and accessories that are used to connect LAN (Local Area Network) and phone equipment within a commercial building. Premise Wiring is standardized, which means that a governing body (ANSI and TIA/EIA) set requirements regarding the minimum performance levels for products used, as well as offer design and layout criteria that must be followed. The result of this standardization is that all manufacturers are "one the same page" with regard to how they make their premise wiring products. Cable installers should follow the same rules which makes it easy to troubleshoot and expand the wiring in the future. |
| Propagation delay | The amount of tiem it takes a signal to travel through a cable or system. |
| Punchdown | Refers to IDC connectors and the method used to terminate them. |
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| Return Loss | The ratio of the power launched into a cable and the power of the light returned down the fiber. This measurement is expressed in positive decibel units (dB). A higher number is better. Return Loss = 10 log (incident power/returned power). |
| RF Video | This method of video signal transmission uses a single coaxial line with a type F connector. It produces the lowest quality video image of all the various interface types. |
| RG/U | Symbols used to represent coaxial cable that is built to U.S. government specifications (R=Radio Frequency, G=Government, U=Universal Specification). |
| RGB (Red, Green, Blue) | This method of video signal transmission uses 3 to 5 coaxial lines with BNC style connectors or HD15 interface. The video signal is split into 3 primary colors (Red, Green, Blue) with separate lines often used for control signals. This method products an extremely high quality video image. |
| Riser | Backbone cabling connecting telecommmunication closets situated vertically on separate floors. |
| RJ11 | A wiring pattern for 6-position modular jacks. Used to refer to the jacks themselves. |
| RJ21 | A wiring pattern for a 25-pair (AMP CHAMP) connector. Also used to refer to the connector themselves. |
| RJ45 | A wiring pattern for 8-position modular jacks. Used to refer to the jacks themselves. |
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| S-Video (SVHS) | This method of video signal transmission utilizes two coaxial lines contained within one outer jacket with a MiniDIN 4 circular connector. One coaxial line carries the black and white information; the second coaxial line carries all the color informatioin. This method produces a high quality video image. |
| Scattering | A second cause of attenuation. Scattering occurs when light collides with individual atoms in the glass. |
| SCSI | Small Computer System Interface. SCSI, (pronounced "skuh-zee") is a "standard" type of device controller for hard disks, tape drives, cd-rom drives, and scanners. Similar in function to an IDE controller. Unfortunately, due to every-changing technology, there are now quite a few types of SCSI controllers that vary in performance and age, with SCSI 1 (a.k.a. "regular" SCSI) being the oldest and slowest. |
| Serial | Serial and parallel are two different communications modes. Serial data is transmitted in single bits, one by one. Parallel data is transmitted in multiple bits and at the same time. Most computers come with both a serial port (usually a DB9 male and/or a DB25 male) and a parallel port (usually a DB25 female). Serial ports are sometimes labeled COM1, COM2, etc. Parallel ports are sometimes labeled LPT1, LPT2, etc. A serial port and a parallel port cannot communicate with each other. To connect two computers via serial ports, you would need a serial null-modem cable. To connect two computers via parallel ports (printer ports) you wold need a parallel data transfer cable with DB25 male connectors. |
| Shielding | Conductive envelope made of wires or metal foil that covers the dieletric and the center conductor of a coaxial cable. |
| Singlemode | A type of fiber with a small core that allows only one mode of light to propagate. A common singlemode type is 9/125. |
| ST Connector | A bayonet-style optical fiber connector. An alternate style per the 568 standard. |
| Star Topology | The topology where wiring stems from one central point. |
| STP | Shielded Twisted Pair. |
| Subminiature D Connector | A family of multipin data connectors available in 9, 15, 25 and 37 pin configurations. Sometimes referred to as DB9, DB15, DB25 and DB37 connectors respectively. |
| Switch | A type of network hub. Provides higher bandwidth than shared hubs. |
| System/3X (IBM) | The predecessor of the AS/400. |
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| T568A and B | The two standard wiring patterns for 8-position modular jacks. |
| Telco | Short for telecommunications (or telephone company). |
| Telco Connector | Refers to a 25-pair (AMP Champ) connector. |
| Telecommunications | Sending, receiving, or emitting of any of an array of signal types including writings, images, sounds, or information of any type via cable, visual, optical or other electromagnetic systems. |
| Telecommunications Closet | Enclosed space for containing telecommunications equipment, cable terminations, and cross-connects. |
| Termination | The process of mechanically installing a connector onto a fiber cable. |
| Thicknet | IEEE 10Base-5. 10Mbps Ethernet on thick coaxial cable. |
| Thinnet | IEEE 10Base-2. 10Mbps Ethernet on thin (RG58) coaxial cable. |
| Token Ring | A network protocol based on a token-passing ring. |
| Twinaxial Cable | An offshoot from coaxial cabling. Two center conductors with one dielectric and braided shielding. |
| Twisted Pair Cable | Cable made from pairs of wires which have been twisted together. |
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| USB | USB (Universal Serial Bus) is a technology that allows computer users to connect up to 127 devices to their computer at the same time. Examples of USB devices are: USB-scanners, keyboards, mice, digital cameras, digital joysticks, CD-ROM drives, hubs, tape drives, floppy drives, etc. |
| UTP | Unshielded Twisted Pair cable. Cable made from pairs of wires which have been twisted together. |
| UTP Solid Cable | Used for runs between two wiring closets or from the wiring closet to a wallplate. This solid-conductor cable, designed for horizontal and backbone cable runs, should not be flexed, bent, or twisted repeatedly. |
| UTP Stranded Cable | Used to make Patch Cables for connecting your workstation NICs to the wallplate, with patch panels, and with other equipment such as hubs and switches. The stranded conductors in patch cable make it excellent for applications that call for repeated flexing, without damaging the cable. |
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| Video Signal Transmission | Video images are transmitted across cables in a variety of ways, from a single coaxial cable to the use of as many as 5 coaxial lines to transmit the video image. Basically, the more the video signal is broken down (use of more transmission lines) into individual components, the better the video image. There are 5 commonly used video signal transmission methods: (1) Red, Green, Blue (RGB); (2) Component; (3) S-Video (SVHS); (4) Composite; and (5) RF Video. |
| VSWR (Voltage Standing Wave Ratio) | Amount of reflected power expressed as a ratio (Example: 1.25:1). VSWR increases as frequency increases. |
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| Wavelength | A means of measuring light color. Expressed in nanometers (nm). |
| Work Area | Building space where occupants utilize telecommunications equipment. |
