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ECSE-6660: Broadband Networks Exam 3: Comprehensive

ECSE-6660: Broadband Networks Exam 3: Comprehensive. Time: 120 min (strictly enforced) Points: 100 YOUR NAME: Be brief, but DO NOT omit necessary detail

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ECSE-6660: Broadband Networks Exam 3: Comprehensive

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  1. ECSE-6660: Broadband Networks Exam 3: Comprehensive Time: 120 min (strictly enforced) Points: 100 YOUR NAME: Be brief, but DO NOT omit necessary detail {Note: Simply copying text directly from the slides or notes will not earn (partial) credit. Brief, clear and consistent explanation will.}

  2. I. Quick True/False Questions: (16 points) Tick True or False (1 pt each). Add a 1 line explanation JUSTIFYING your choice (1 pt each) T F Long-period and short-period fiber gratings both behave as Bragg gratings 1R regeneration performs the same function as all-optical amplification Lasers work on the principle of spontaneous emission of radiation Spectral width of lasers is the same as its line width

  3. Tick True or False (1 pt each). Add a 1 line explanation JUSTIFYING your choice (1 pt each) T F NHRP is intended for making ATM run over Ethernet Diff-serv is a connectionless and stateless QoS architecture Delta modulation is an example of a vocoder SIP uses a gatekeeper to make phone calls to email addresses

  4. II. (12 pts) Explain the economic and technical rationales for the following technology transitions: a) T-carrier hierarchy to Survivable SONET/SDH [4 pts] b) SONET to (D)WDM [4 pts] c) WDM to Optical Transport Networks (OTNs) [4 pts]

  5. III. (12 pts) A. (6 pts) Define the meaning of the following terms: a) Modal dispersion, b) Chromatic Dispersion c) Four Wave Mixing B.(6 pts) Describe the ways and exactly how (eg: optical components, fiber innovations) the above technical problems were solved in optical communication:

  6. IV. (12 pts) What are the fundamental technical (not functional!) differences between: a) Optical amplifiers (eg: EDFA) b) Lasers c) LEDs d) Fabry-Perot etalons used for filtering e) P-I-N Photodetectors

  7. V. (12 pts) What are the key differences between the following survivability techniques: Linear APS, UPSR, 2-fiber BLSR and 4-fiber BLSR [6 pts]. Where are these techniques typically deployed in today’s broadband networks [2 pts]? Why are these techniques deployed in these places [2 pts]? Describe how mesh-based survivability differs from these methods in terms of techniques and objectives? [2 pts]?

  8. VI. (12 pts) Describe the differences between the following forms of QoS scheduling: priority, round-robin, GPS, bit-by-bit round-robin, and weighted fair queuing scheduling

  9. VII. (12 pts) Describe the key differences between QoS routing (eg: PNNI), traffic engineering (eg: MPLS, BANANAS) and regular IP routing (eg: OSPF, BGP)

  10. VII. (12 pts) SONET OC-48 line cards cost $25K ea, whereas IP/SONET OC-48 line-cards cost $100K ea. The primary reason is the complexity of IP lookup and scheduling/buffer management implemented in ASIC/FPGA/network processors. Describe WHY IP lookup and scheduling/buffer management are so complex [8 pts]. Also describe the key tradeoffs in the choice of ASICs vs network processors [4 pts].

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