fundamentals of telecommunication excercises

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    Exercise no. 1

    As a new service provider, you plan to deploy a telecommunication network with 20 exchange system nodes,

    5 of which provide transit functionality only. How many transmission system components do you need to install

    within the transport network among the exchange system nodes if

    a the exchange system nodes are to be interconnected completely meshed?

    b the exchange system nodes are to be interconnected in a ring structure?

    c the transit nodes are to be interconnected completely meshed and the remaining exchange nodes are arranged

    in 5 independent rings, each of which integrates one of the transit nodes (providing all rings comprise the same

    number of exchange nodes)?

    d Which of these network structures is beneficial regarding service availability, which is beneficial regarding system

    acquisition costs?

    e Which of these networks structures would you deploy, and why?

    Fundamentals of Telecommunication: Exercises 1

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    Exercise no. 2

    The telecommunication network shown below consists of 2 PCs, 1 ISDN exchange system, 1 POP (Point Of

    Presence) and 1 router connected to a LAN. The PCs communicate via IP data packets.

    a Identify the multiplexing mechanisms applicable to the following systems as shown in the figure above (multiple

    answers possible).

    PC at LAN STD, Space Division Multiplex, Wavelength Division Multiplex,

    Frequency Division Multiplex, ATD with variable block length,

    ATD with constant block length, Code Division Multiplex

    ISDN Exch. STD, Space Division Multiplex, Wavelength Division Multiplex,

    Frequency Division Multiplex, ATD with variable block length,

    ATD with constant block length, Code Division Multiplex

    b Identify the connection concepts applicable to the following systems as shown in the figure above.

    IP Router Connection-oriented communication,

    Connectionless communication

    POP Connection-oriented communication,

    Connectionless communication

    c Identify the switching/routing principles applicable to the following systems as shown in the figure above.

    ISDN Exch. Circuit switching,

    Packet switching

    IP Router Circuit switching,

    Packet switching

    IP

    Router

    ISDN

    Exchange POP

    ISDN ISDN Internet LAN

    Fundamentals of Telecommunication: Exercises 2

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    Grundlagen der Telekommunikation Informationsbertragung II

    3

    Ethernet-

    LAN 2

    PC 1

    PC 2

    PC 3

    IP-

    Router

    1

    Ethernet-

    Switch

    a

    b

    d

    c

    e

    Ethernet-

    LAN 1

    IP-

    Router

    2 f

    Ethernet-

    LAN 4

    Ethernet-

    LAN 3

    DSLAM

    IP over ATM over ADSL

    Exercise no. 3

    a Identify the multiplexing mechanisms applicable to the following systems as shown in the figure above (given that

    PCs 1 and 3 exchange a file via IP data packets).

    PC 3 STD, Space Division Multiplex, Wavelength Division Multiplex,

    Frequency Division Multiplex, ATD with variable block length,

    ATD with constant block length, Code Division Multiplex

    DSLAM STD, Space Division Multiplex, Wavelength Division Multiplex,

    Frequency Division Multiplex, ATD with variable block length,

    ATD with constant block length, Code Division Multiplex

    b Identify the connection concepts applicable to the following systems as shown in the figure above (given that PC

    1 requests a web site hosted by PC 2)

    PC 2 Connection-oriented communication,

    Connectionless communication

    Switch Connection-oriented communication,

    Connectionless communication

    c PC 1 sends an IP packet to PC 3. Identify all interfaces (af) within the figure above, on which a pure Ethernet

    frame is sent (assume that both, the Ethernet switch and the IP router are aware of any information required in

    order to forward the packet correctly).

    Fundamentals of Telecommunication: Exercises 3

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    Exercise no. 4

    Identify the switching/routing technology/-ies (IP, ATM, or 64 kbit/s) most adequate for the following applications.

    Substantiate your decision briefly.

    a Voice communication

    b Data communication via Internet

    c Intermittent sending and receiving of short data packets

    d Combined voice and data communication

    e Data exchange between branch offices of a major bank

    Exercise no. 5

    A protocol stack comprises protocols for layers 1 to 4, providing the following frame layouts

    (PCI = Protocol Control Information, SDU = Service Data Unit).

    - Layer 1 protocol: PCI = 2 Byte, SDU = 98 Byte

    - Layer 2 protocol: PCI = 4 Byte, SDU = 94 Byte

    - Layer 3 protocol: PCI = 20 Byte, SDU = 74 Byte

    - Layer 4 protocol: PCI = 20 Byte, SDU = 54 Byte

    Calculate the overhead (in percent) in relation to the overall amount of transferred data.

    Fundamentals of Telecommunication: Exercises 4

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    Exercise no. 6

    You can choose between an IP-based and an ATM-based communication network.

    a Which network would you prefer to provide a video conference? Substantiate your decision briefly.

    You now continuously transfer media payload packets, each sized 480 Byte.

    b Calculate the overhead (in percent) in relation to the overall amount of transferred data if IP technology is used.

    c Calculate the overhead (in percent) in relation to the overall amount of transferred data if ATM technology is

    used.

    Fundamentals of Telecommunication: Exercises 5

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    Exercise no. 7

    A vending machine (e.g. selling beverages) is given. A coin is already inserted. The machine is deployed as a

    Mealy state machine. The state graph is given in the figure below.

    The vending machine provides the two conditions C1 and C2. The following 3 input signals are used.

    I = Coin inserted

    P = Button for product request pressed

    M = Button for money return pressed

    The following 3 output signals are used.

    D = Dispense product

    R = Return coin

    N = No reaction

    Outline an SDL diagram showing the conditions and process flows of this vending machine.

    C1 C2

    M, R

    P, D

    I, N

    I, R

    P, N

    M, N

    Fundamentals of Telecommunication: Exercises 6

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    Exercise no. 8

    A L3 protocol instance of a telecommunication equipment is described by the following state table.

    Use the given information to develop the corresponding

    a state diagram.

    b SDL diagram.

    State Event/Input

    0 1 2 3 4

    Start

    Start IND / 1

    Start REQ

    Start / 3

    No interest

    - / 0

    In progress

    In progress IND / 4

    In progress REQ

    In progress / 2

    Done

    Start CONF / 5

    Start RESP

    Done / 5

    Fundamentals of Telecommunication: Exercises 7

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