4:39 texsu.blackboard.com QUESTION 13 at customer premises implement the physica
ID: 3723216 • Letter: 4
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4:39 texsu.blackboard.com QUESTION 13 at customer premises implement the physical layer of the DOCSIS standard QUESTION 1 Twists could reduce radiated signal (interference QUESTION 1 Wires are hard to tap while fiber fibers are easy to tap. QUESTION 1 To manage interference, spectum is carefully divided, and its use regulated and licensed, e.g., sold at auction Wireless channels are easy to engineer a fixed data rate in a point-to- point manner QUESTION 1 LEO satelites orbit 35,000 km above a fixed location Satellites have enormous bandwidth over long distances QUESTION 2 Internet over cable reuses the cable television plant, where data is sent on the shared cable tree from the head-end, not on a dedicated line per subsoriber (DSL)Explanation / Answer
14)true-Fourier Analysis
15)true-Twisting can reduce cable radiation when two adjacent wires are carrying signal and return current in opposite directions. The benefit is greatest when the opposing current has equal magnitude and is 180-degrees out of phase. Fields emitted by adjacent half-twists tend to cancel. Even if the wires carry unequal current or if the current is not completely out of phase, partial field cancellation is still beneficial.
16)false-Optical fibers are difficult to tap. As they do not radiate electromagnetic energy, emissions cannot be intercepted. As physically tapping the fiber takes great skill to do undetected, fiber is the most secure medium available for carrying sensitive data.
17)true-Fortunately, there are also unlicensed (“ISM”) bands: ISM: Industrial Scientific and Medical Radio band o Free for use at low power; devices manage interference .Widely used for networking; WiFi, Bluetooth, Zigbee, etc.
18)false-wires/fibers are Easy to engineer a fixed data rate over point-to-point links.
19)false- Low-Earth Orbit (LEO) 0-5000 km
20)false-fiber have Enormous bandwidth over long distances
21)true-Cable technology is commonly called “hybrid fiber-coaxial” or HFC. This is because most cable systems consist of fiber connections from the operator’s headend or hub facility (the cable counterpart of the telephone central office) to an optical “node” near the customer premises, and thereafter comprise coaxial cable to the premises
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