Week Three Homework

2237 WordsDec 3, 20129 Pages
Carlyle Brown Network Protocols and Standards Week 3 Homework 1. When was the first major standard describing a structured cabling system released? c. 1995 2. Why is balance an issue in UTP cables, and what is TCL? i. The balance or symmetry of the signal over the wire pairs helps minimize unwanted leakage of the signal. ii. TCL - Transverse Conversion Loss - The TCL measurement is obtained by applying a common-mode signal to the input and measuring the differential signal level on the output. a. TCL is sometimes called LCL (Longitudinal Conversion Loss). The ELTCLT value (expressed in dB) is the difference between the TCTL and the differential mode insertion loss of the pair being measured. TCTL is the loss from a balanced…show more content…
18. What is the data rate for gigabit Ethernet? i. 1000Mbps (802.3z) 19. What is a benefit of using shielded twisted-pair cabling? i. Cable with the addition of a shield is called shielded twisted-pair (STP) cable. The addition of this shield reduces the potential for electromagnetic interference (EMI) as long as the shield is grounded. a. EMI originates from devices such as motors and power lines, and from some lighting devices such as fluorescent lights.20. 20. Which cable, UTP or STP, is preferred by the industry? i. Industry testing on STP cable has shown that the addition of a shield does increase the usable bandwidth of the cable by increasing the noise rejection between each of the wire pairs. However, the tests have shown that there is not a significant advantage of placing a shield over a properly installed 4pair 100-ohm UTP cable. ii. Most manufacturers are recommending the use of UTP cable for cabling computer networks except for very noisy environments. ------------------------------------------------------------------------------------------------------- Section 2-4 21. What are the color maps and pin # assignments for T568A and T568B? i. T568A – White-Green/Green/White-Orange/Blue/White-Blue/Orange/White-Brown/Brown a. 1 2 3 4 5 6 7 8 ii. T568B –

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