Circle the right answers and answer questions

Circle the right answers and answer questions


HOMEWORK #2 - TDC 512 ASSIGNMENT #2 NET 371 - WIRELESS COMMUNICATION NETWORKS Name________________________________ Multiple Choice (4) points each (1) In an Ethernet backhaul network architecture, the connection between the cell site and the Metro Ethernet cloud is: (a) DS-3 (b) Fast Ethernet (c) Gigabit Ethernet (GigE) (d) 10 Gigabit Ethernet (e) Cable Modem (2) In an LTE network architecture, the function of the Mobility Management Entity (MME) is: (a) QoS decisions (b) Device registration and tracking, and bearer management (c) Subscription data and security information (d) Default gateway, packet filtering and QoS enforcement (e) Packet data routing and mobility “anchor” (f) None of the above (3) The uplink technology in an LTE system is which technology below ? (a) GSM (b) SC-FDMA (c) LTE + (“LTE Advanced”) (d) UMTS (e) AMPS (f) None of the above (4) Which 3.5 technology was the first to be commercially deployed? (a) HSUPA (b) LTE (c) HSDPA (d) CDMA1X-EVDO (e) CDMA 1XRTT (5) In legacy (i.e. 2G, 3G) wireless backhaul networks (where voice is not packetized), each wireless call carried over the backhaul network occupied how much bandwidth ? (a) 53 bytes (b) One DS-0 (c) One DS-1 (d) One DS-3 (e) 64 Kbps (f) Both (b) and (e) above (6) With 5G technology, how long will it take to download an HD Movie ? (a) 5 milliseconds (b) 26 hours (c) 6 minutes (d) 3.6 seconds (7) 5G offers low latency. To be more specific….from 200 milliseconds for 4G (between sending and receiving), we go down to ______ with 5G. (a) 50 nanoseconds (b) 3 seconds (c) 1 millisecond (1 ms) (d) 100 milliseconds (100 ms) (8) Which tower is the median type from a cost and height perspective ? (a) Guyed tower (b) Monopole tower (c) Free standing (aka “self supporting”) tower (d) None of the above (9) The LTE “control plane” capacity of a cell base station, presuming all devices are in an “active state”, is: (a) 2000 users per cell (b) 50 users per cell (c) 200 users per cell (d) 500 users per cell (e) 100 users per cell (10) Towers must be lit or marked if they are above what height ? (a) 2000 feet (b) 200 feet (c) 500 feet (d) 1000 feet (e) 100 feet (11) Even-numbered Fresnel zones: (a) Will cause reflected signals to arrive at the distant end receiver out of phase with the direct radio beam. Thus, their impact will detract from (weaken) the total, composite signal arriving at the receiver. (b) Will cause reflected signals to arrive at the distant end receiver in phase with the direct radio beam. Thus, their impact will be to supplement the total, composite signal arriving at the receiver. (c) Will have no effect on the composite signal at the distant end receiver (d) Will only affect the composite signal at the receiver on rainy days (12) In an LTE network architecture, the function of the Packet Data Network (PDN) Gateway (P-GW) is: (a) Packet data routing and mobility “anchor” (b) QoS decisions (c) Device registration and tracking, and bearer management (d) Subscription data and security information (e) Default gateway, packet filtering and QoS enforcement. (13) Which item below is a dedicated connection switching technology that organizes digital data into 53-byte “cells” and transmits these cells over a physical medium using digital signal technology? (a) ATM (b) PGW (c) UTRAN (d) Metro Ethernet (e) Free Space Optics (FSO) (14) Which type of tower has an associated cost that is directly associated with its height? (a) The monopole tower (b) The guyed tower (c ) The free standing tower (d) The monochrome tower (e) The lattice tower True or False (4) Points Each (15) ______ All routed TCP / IP transmissions are examples of statistical multiplexing (16) ______ Until Ethernet technology was deployed in modern backhaul networks, the physical link between the cell base station and the core network was a huge traffic bottleneck. (17) ______ LTE air interface channel size options are from 1.4 Mhz to 300 Mhz (18) ______ HSPA rollouts were achieved through software upgrades to the existing network (existing equipment). (19) ______ Voice calls are always prioritized over data sessions (traffic) in cellular transmissions from the base station into the core network. (20) ______ Only some parts of LTE network architectures support TCP / IP (IP) (21) ______ Optical fiber is a mandatory prerequisite in order to support Ethernet To The Cell Site (ETTCS) (22) ______ The backhaul network can be a hybrid network, comprised of different types of transmission media such as leased copper facilities, microwave radio systems, or leased optical fiber facilities. (23) ______ 10 Gigabit Ethernet (10 GigE) circuits are used going into the MTSO to collect traffic backhauled from cell sites using Gigabit Ethernet (Metro Ethernet). This is why the 10 GigE circuits are called “collector” circuits. (24) ______ Today, the key to successfully control the growth in mobile traffic (in the backhaul network) is to decouple bandwidth requirements from cost. (25) ______ Coax cable is used in microwave radio systems that use frequencies above 3 Ghz.