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Network Cabling Solutions Appendix Channel The end-to-end transmission path connecting any two points at which application specific equipment is connected. Equipment and work area cables are included in the channel. 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". Consolidation Point (CP) A location for interconnection between horizontal cables that extend from building pathways and horizontal cables that extend into work area pathways. Cross Connect A facility enabling the termination of cables as well as their interconnection or cross connection with other cabling or equipment. Also known as a distributor. 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 electro-magnetic coupling from one signal path to another. Crosstalk performance is expressed in decibels. D Decibel (dB) A standard unit for expressing transmission gain or loss as derived from a ratio of signal voltages or power. Delay Skew The difference in propagation delay between the fastest and slowest pair in cable or cabling system. Entrance Facility, Telecommunications An entrance to a building for both public and private network service cables (including antennae) beginning with the entrance point at the building wall and continuing to the entrance room or space. Entrance Point, Telecommunications The point of emergence of telecommunications conductors through an exterior wall, a concrete floor slab, or from a rigid metal conduit or intermediate metal conduit. 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. Equal Level Transverse Conversion Transfer Loss (ELTCTL) A calculation, expressed in dB, of the difference between measured TCTL and the differential mode insertion loss of the disturbed pair. Equipment Cable A cable or cable assembly used to connect telecommunications equipment to horizontal or backbone cabling. Equipment Room (ER) A centralized space for telecommunications equipment that serves the occupants of the building or multiple buildings in a campus environment. An equipment room is considered distinct from a telecommunications room because it is considered to be a building or campus serving (as opposed to floor serving) facility and because of the nature or complexity of the equipment that it contains. F Demarcation Point (DP) A point at which two services may interface and identify the division of responsibility. 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. Far-End Crosstalk (FEXT) Crosstalk measured at the opposite end from which the disturbing signal is transmitted. Firestop A material, device, or assembly of parts installed in a cable pathway at a fire-rated wall or floor to prevent passage of flame, smoke or gases through the rated barrier (e.g. between cubicles or separated rooms or spaces). E G Electromagnetic Interference (EmI) The interference in signal transmission or reception caused by the radiation of electrical and magnetic fields. Electronic Industries Alliance (EIA) An organization that sets standards for interfaces to ensure compatibility between data communications equipment and data terminal equipment. Entrance Facility (EF) 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. Ground A conducting connection, whether intentional or accidental, between an electrical circuit (telecommunications) or equipment and earth, or to some conducting body that serves in place of the earth. H Hertz (Hz) A measure of frequency as defined in units of cycles per second. Home-Run Cabling A distribution method in which individual cables are run directly from the horizontal cross connect to each telecommunications outlet. This configuration is also known as "star topology". For product information visit www.hellermann.tyton.com or call 800.537.1512 225