6627213
Description
Flashcards by Daisy Ordonez, updated more than 1 year ago
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Created by Daisy Ordonez
over 7 years ago
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| Question | Answer |
| When was the first major standard describing a structured cabling system released? | 1995 |
| What does EIA and TIA stand for? | EIA stands for Electronic Industries Alliance TIA stands for Telecommunications Industry Assoication |
| What are the three parts of the EIT/TIA 568-B standard? | EIA/TIA-568-B.1: Commercial Cabling Standard, Master Document EIA/TIA-568-B.2: Twisted Pair Media EIA/TIA-568-B.3: Optical Fiber Cabling Standard |
| Identify the six subsystems of a structured cabling system? | 1. Building Entrance 2. Equipment Room (ER) 3. Telecommunications Closet 4. Backbone Cabling 5. Horizontal Cabling 6. Work Area |
| What is cross-connect? | A space where you are going to take one or multiple cables and connect them to one or more cables or equipment |
| What is main cross-connect? | (MC) Usually connects two or more buildings and is typically the central telecommunications connection point for a campus or building. |
| The Telco and the ISP usually connects to what room in the campus network hierarchy? | (ER) Equipment Room |
| What is the WO, and what is its purpose? | Workstation or Work Area Outlet (WO) also called teh TO (telecommunications outlet) is used to connect devices to the cable plant. |
| The patch cable from a computer typically terminates into which of the following? | Jack in the wall plate |
| What is the over all length limitation of an individual cable run from the telecommunications closet to a networking device in the work area? | 100 meter |
| A general rule of thumb is to allow how many meters for the cable run from the telecommunications closet to the work area? | 90 meters |
| What is the difference in CAT 5 and CAT 5e? | CAT5e cable is an enhanced version of CAT5 and provides improved performance requirements of the cable. |
| What is the data rate for Ethernet? | 10 Mbps |
| What is the data rate for FastEthernet? | 100 Mbps |
| What improvements will CAT6 and CAT7 cable provide? | CAT6 standard supports 10 gigabit data rates up to 100 meters and CAT7 will also supports 10 Gbps up to 100 meters with improved bandwidth |
| What is the benefit of using shielded twisted-pair cabling? | An addition of a shield reduces the potential for electromagnetic interference |
| Which cable UTP or STP is preferred by the industry? | UTP |
| What are the color maps and pin # associated for T568A and T568B? | T568A 1 white green 2 green 3 white orange 4 blue 5 white ble 6 orange 7 white brown 8 brown T568B 1 white orange 2 orange 3 white green 4 blue 5 white blue 6 green 7 white brown 8 brown |
| What is the difference between T568A and T568B? | They are just two different manufacturer standards used to wire the modular connection hardware. There is not a performance improvement just a color order choice |
| How many wires pairs are in a CAT6 twisted-pair cable? | four |
| What does an X on the input to a hub represet? | Cross-connected input |
| Define the term cross-connected input? | This means that transmit and receive pairs are internally swapped to maintain proper signal alignment of the TX and RX pairs. |
| Define the term NEXT and what it measures | Near end crosstalk A measure of the level of crosstalk or signal coupling within the cable, with a high NEXT (dB) value being desirable |
| Define power sum measurements? | The enhanced twisted-pair cable must meet four-pair NEXT requirements, called PSNEXT testing. power sum testing measures the total crosstalk of all cable pairs. |
| Define propagation delay? | The measure of the amount of time it takes for a signal to propagate from one end of the cable to the other. |
| Signals travel in a cable at some percentage of the velocity of light. The term of this is? | NVP Nominal velocity of propagation |
| Why is delay skew critical? | The measure of the difference in arrival time between the fastest and the slowest signal in a UTP wire pair. |
| Why are power-sum measurements critical for high speed data communication over UTP | The gigabit data rate capability of twisted pair requires the use of all four wire pairs in the cable with each pair handling 250 mbps of data. |
| What is the limit on the bend radius for a UTP cable, and why is this important? |
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