Network+ Chapter 5: Network Cabling

- D. Bandwidth - Bandwidth, the amount of data that could theoretically be transmitted during a given period of time.

- D. Next - NEXT(near end crosstalk), crosstalk that occurs between wire pairs near the source of the signal

- B. STDM (statistical time division multiplexing) - STDM(statistical time division multiplexing), assigns time slots to nodes (similar to TDM), but then adjusts these slots according to priority and need.

- A. Coaxial Cable, F-Connector - F-connectors, attach to coaxial cable so that the pin in the center of the connector is the conducting core of the cable. - BNC connector is crimped, compressed, or twisted onto a coaxial cable.

- C. Cat 5e, Cat 6a, Cat 7 - CAT 5e (enhanced) 1000 Mbps 350 MHz Higher-grade version of Cat5 higher twist ratio - CAT 6a (augmented) 10 Gbps 500 MHz Reduced attenuation and crosstalk. Reliable Gb - CAT 7 (Category 7) 10 Gbps 600 MHz Higher frequency, wire pair has shielding

- B. White/Green - T568A Wiring Pin #1 White/Green, The Federal Government requires T568A on all federal contracts.

- C. Cat 6a - CAT 6a (augmented) 10 Gbps 500 MHz Reduced attenuation and crosstalk. Reliable 10Gb

- C. Fiber Type Mismatch - Fiber Type Mismatch- this term is misleading because a fiber type mismatch is actually more of a fiber core mismatch.

- C. Tone Locator - Tone locator (or probe), a device that emits a tone when it detects electrical activity on a wire. They are often sold together as a kit.

- A. MTRJ - MTRJ N/A Polish 2 Fibers Full Duplex

- RTT (round trip time), the most common way to measure latency or the length of time it takes for a packet to go from sender to receiver, then back from the receiver to sender. RTT is usually measured in milliseconds.

- Twist Ratio, the number of twists per meter or foot. - The more twists per foot in a pair of wires, the more resistant the pair will be to crosstalk or noise.

- Kevlar (a polymeric fiber) surrounds the plastic buffer to prevent the cable from stretching, and to protect the inner core further.

- SIZE AND SCALABILITY, depending on the type of fiber-optic cable used, segments lengths vary from 2 to 40,000 meters. Optical Loss, or the degradation of the light signal after it travels a certain distance away from its source will hit the maximum limit.

- Signals traveling over multimode fiber experience greater attenuation than those traversing single mode fiber, therefore, is not suited to long distances longer than a few Km

- APC connection reflects any signal loss in a different direction than the source of the signal. Back reflection worsens in UPC connections over time, but APC connections are not as sensitive to degradation from repeatedly disconnecting and reconnecting cables.

- SFP+, developed later than XFP and is the same module size as SFP, theoretical maximum transmission speed is 16 Gbps

- SMF, allows to accommodate the highest bandwidths and longest distances (without requiring repeaters). - MMF, is not suited to distances longer than a few kilometers.

- Short Circuit, is an unwanted connection, such as when exposed wires touch each other. - Open Circuit, is one where needed connections are missing, such as when a wire breaks.

- Cable performance tester, measures the overall performance of a cabling structure, line tester, certifier, network tester. Allows you to perform the same continuity and fault tests as a continuity tester, but can also be used to: o Measure the distance to a connectivity device, termination point, or damage in a cable