BICSI (Actual) Exam Solved 100% Correct

Simplex - ANSWER-Transmits signals in only one direction (listener has no way to respond) and public address system is example Half duplex - ANSWER-Transmits signals in both directions but only once at a time (push to talk systems) Full duplex - ANSWER-Transmits signals in both directions at the same time (telephones) EMI - ANSWER-Electromagnetic interference Alternating current - ANSWER-0 max 0 Direct current - ANSWER-0 max (battery) RFI - ANSWER-Disturbance in electromagnetic signals Frequency - ANSWER-Number of cycles a signal is repeated in time period Bandwidth - ANSWER-Info carrying capacity of a system Analog signal - ANSWER-Continuously varying signals that follow loudness(AMPT) and frequency(tone) Digital signal - ANSWER-Non-continuous signal that changes from one state to another in a distinct order Decibel - ANSWER-Measure of analog signal strength Megahertz - ANSWER-Bandwidth of system in a frequency range of interest Megabit - ANSWER-Number of bits of info that can be transported over the media Resistance - ANSWER-Conductors ability to resist the flow of electrical energy Inductance - ANSWER-Electrical forcefield around conductor that opposes changes in current flow Capacitance - ANSWER-Storage of electrical charges when potential voltages exist between conductors Mutual capacitance - ANSWER-Two conductors Unbalanced capaitance - ANSWER-Conductors and ground Impedance - ANSWER-Total opposition to current flow (AC circuits) Characteristic impedance - ANSWER-Input impedance of a uniform analog transmission line of infinite length Value of characteristic impedance - ANSWER--Material & diameter of conductors -distance between conductors -insulating values of seperators Attenuation ( intersection loss ) - ANSWER-- measure of signal loss between transmitter and receiver - measure of signal loss in the amplitude when signal is transmitted - measure of decibels per unit length at a given frequency - loss of usable signal during g transmissions Return loss - ANSWER-Decibels of the power of the outgoing signal to the power of the reflected signal Cross talk - ANSWER-Unwanted transfer of electromagnetic energy to 1 or more circuits Near end crosstalk (NEXT) - ANSWER-Unwanted signal coupling from a transmitter at the near end into another pair measured at the near end Far end crosstalk (FEXT) - ANSWER-Unwanted signal coupling from a transmitter at the near end into a neighboring pair measured at the far end Nominal velocity of propagation (NVP) - ANSWER-Ratio of Speed of transmission along a cable relative to the speed of light in a vacuum Propagation delay - ANSWER-Time it take for a signal to be transmitted from one end of a circuit to another Delay skew - ANSWER-Difference in speed between the fastest and slowest pairs within the same cable Insulation - ANSWER-The conductance of a cable indicates the potential for current to leak through the insulation, conductance in inversely related to resistance Shielding purposes - ANSWER-- reduce the level of the signal radiated from the cable - minimize the effect of external EMI on the cable pairs - provide physical protection Shielding characteristics - ANSWER-- foil will typically block higher frequencies (30 MHz and higher) - copper braids will block lower frequencies - solid tubing will block all frequencies - CBCs may help divert all induced frequencies from susceptible cables Structured cabling system (SCS) - ANSWER-Complete and collective configuration of cabling and associated hardware Information technology systems (ITS) - ANSWER-- plain old telephone system (POTS) - voice over internet protocol (VolP) - unified messaging systems - videoconferencing - computer networking Differences between ITS systems - ANSWER-- structure of the building - cable and connection hardware - function of the ITS cabling installation - configuration of an existing cabling system - warranties - customer requests Standardized ITS systems - ANSWER-- Conformance to physical and transmission installation - consistency in cabling design and install - a basis of examining a proposed system - uniform documentation SCS components - ANSWER-- backbone cabling and associated pathways - cross connection facilities - interconnection facilities - cabling methods - horz. Cabling and associated pathways - work areas - telecommunications outlets/connections - consolidation points (CPs) - multiuser telecom outlets assemblies (MUTOA) - transition points - centralized cabling - distributed cabling - admin (labeling, documentation) Inter-building backbone - ANSWER-Distribution of telecom services between buildings Intra-building backbone - ANSWER-Distribution of telecom services within one building