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structured cabling I

Lesson 6: Unshielded Twisted Pair Cables/

QuestionAnswer
The two conductors of a twisted pair are normally referred to as the tip and the ring. true
When a pair of wires is not twisted, each of the wires will have identical electrical characteristics with respect to ground. This results in the same levels of induced noise voltage on each of the wires false
By allowing each of the pairs in a twisted pair cable to have a different twist length, the degree of ? is reduced. pair-to-pair capacitive coupling
The transmission characteristics of Category 3, Category 4, and Category 5 cables are specified at frequencies up to ? , ? , and ? , respectively. 16 / 20 / 100 MHz
The required characteristic impedance for UTP cables is ? , ? in the frequency range from ? up to the highest referenced frequency. 100 Ω / 15% / 1 MHz
The impedance of a twisted pair varies with frequency due to structural non-uniformities. true
Category 5e cables exhibit ? insertion loss than Category 3 cables. lower
For a given cable, as frequency increases, attenuation ? . increases
NEXT is the undesired coupling of energy from the transmit pair into the receive pair. true
? is the ratio of the worst-case attenuation of pairs in a cable to the worst-case pair-to-pair NEXT. ACR
For a given cable, as frequency increases, NEXT ? . decreases
? loss is the undesired signal coupling between adjacent pairs at the far end (the opposite end of the transmit end) of cabling or a component. ACRF
The sum of the near end crosstalk power from all other pairs in the cable, link, or channel is expressed in terms of ? . PSNEXT
A(n) ? is typically installed at each end of a UTP backbone cable which has a corrugated aluminum shield over the core for the purpose of grounding the cable. bonding clamp
There are ? pairs in each binder group of a multi-pair UTP backbone cable. 25
Within a binder group, the tip conductor of pair number ? is colored yellow/orange, and the ring conductor is colored orange/yellow. 17
Within a 300 pair UTP backbone cable, there are ? binder groups. 12
Within a 300 pair UTP backbone cable, binder group ? is wrapped with two plastic ribbons whose colors are red/blue 6
? is the difference in the delay time for each of the pairs in a 4-pair cable. delay skew
? is measured in decibels and is the ratio of the transmit signal to the reflected signal of the cabling. return loss
Which cable is not recognized for use in a horizontal cabling system? 2 pair 75 Ω UTP
Created by: Yusosweet1
 

 



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