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A comprehensive overview of key concepts and definitions related to telecommunications cabling, as defined by bicsi standards. It covers various aspects, including signal transmission types, electromagnetic interference, signal characteristics, cabling components, and grounding systems. Presented in a question-and-answer format, making it easy to understand and retain information.
Typology: Exams
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Simplex โ: Transmits signals in only one direction (listener has no way to respond) and public address system is example Half duplex โ: Transmits signals in both directions but only once at a time (push to talk systems) Full duplex โ: Transmits signals in both directions at the same time (telephones) EMI โ: Electromagnetic interference Alternating current โ: 0 โ max โ 0
Direct current โ: 0 โ max (battery) RFI โ: Disturbance in electromagnetic signals Frequency โ: Number of cycles a signal is repeated in time period Bandwidth โ: Info carrying capacity of a system Analog signal โ: Continuously varying signals that follow loudness(AMPT) and frequency(tone) Digital signal โ: Non-continuous signal that changes from one state to another in a distinct order Decibel โ: Measure of analog signal strength
โ: Conductors and ground Impedance โ: Total opposition to current flow (AC circuits) Characteristic impedance โ: Input impedance of a uniform analog transmission line of infinite length Value of characteristic impedance โ: - Material & diameter of conductors
โ: Decibels of the power of the outgoing signal to the power of the reflected signal Cross talk โ: Unwanted transfer of electromagnetic energy to 1 or more circuits Near end crosstalk (NEXT) โ: Unwanted signal coupling from a transmitter at the near end into another pair measured at the near end Far end crosstalk (FEXT) โ: Unwanted signal coupling from a transmitter at the near end into a neighboring pair measured at the far end Nominal velocity of propagation (NVP) โ: Ratio of Speed of transmission along a cable relative to the speed of light in a vacuum Propagation delay โ: Time it take for a signal to be transmitted from one end of a circuit to another Delay skew
Information technology systems (ITS) โ: - plain old telephone system (POTS)
SCS components โ: - backbone cabling and associated pathways
โ: Rigid metallic conduit FMC โ: flexible metallic conduit RNC โ: Rigid nonmetallic conduit ATR โ: Straight section fully threaded round rod stock NRTL โ: Nationally recognized testing laboratories GRC โ: Galvanized rigid conduit IMC โ: Intermediate metallic conduit
โ: Conduit fill defaming factor EF โ: Entrance facility BCT โ: Bonding conductor for telecom TMGB โ: Telecom main grounding bus bar ER โ: Equipment room TR โ: Telecom room TGB
โ: Private branch exchange GEC โ: Grounding electrode conductor ACEG โ: Alternating current equipment ground RGB โ: Rack grounding bus bar RBC โ: Ranch bonding conductor OSP โ: Lighting exposure for outside plant UTC โ: Under carpet telecom cable
โ: Bayonet Neil concelman S/FTP โ: Overall braid screen with foil screened twisted pair IDC โ: Insulation displacement contact TDR โ: Time domain deflectometer ACR โ: Attenuation to crosstalk ratio Align crosstalk (ATX) โ: Unwanted signal coupling from a disturbing pair of a 4-pair cable channel, permanent link, or component to a disturbed pair of another 4-pair channel, permanent link or component UTP
โ: Com. Plenum CMR โ: Com. Riser CMG โ: Com. General CM โ: Communications CMX โ: Com. Limited CMUC โ: Under carpet com. LSZH(LSF) โ: Low smoke zero halogen (low smoke and fume)
โ: Electric security systems AV โ: Audiovisual systems BAS โ: Building automation system IDC โ: Insulation displacement contact IPC โ: Insulation piercing contact TP โ: Interconnection point between horizontal cabling and under carpet telecom cable UTC
