Describe briefly the major differences between pure Time Division Multiplexing (TDM) and Statistical Time Division Multiplexing (STDM).

all these questions must be solved:
1.Describe briefly the major differences between pure Time Division Multiplexing (TDM) and Statistical Time Division Multiplexing (STDM). How does a STDM multiplexer identify which data goes to which server port (user)? Utilising pure time domain multiplexing, User A, User B and User C share a physical TDM channel in the following pattern: AABX AABC AABX AABC, here X indicates an unused time slot. If the transmission bandwidth allocated to User B is 100kb/s, work out the transmission bandwidths for User A and User C.

2.Two error digits occur in the received 16 information digits shown in Fig.1. If a Forward Error Correction (FEC) technique using even parity check for each column/row of the information matrix is applied, based on the given column/row parity digits, correct the error digits received. State briefly the conditions under which the parity check-based FEC technique fails.

3.Draw a diagram to show a typical data network architecture including terminals, access networks and a core network. Describe the relationships between communication architectures and protocols.

4.Name all the layers contained in the OSI reference model. Based on the OSI Reference model, match the following to one or more layers of the model: i) Error correction and retransmission; ii) Establishment, management and termination of communication sessions; iii) Route determination; iv) Responsibility for carrying frames between adjacent nodes; v) Communicates directly with users application programme; vi) Mechanical, electrical and functional interface; vii) Flow control, and viii) Reliable process-to-process message delivery.

5.As shown in the diagram below, computer A sends a message to computer D via LAN1, Router R1 and LAN2. Each device has a pair of addresses (logical and physical) for each connection. The logical addresses are indicated using letters and the physical addresses are indicated using numbers. Assume that the communication is between a process running at computer A with port address a and a process running at computer D with port address j,
Draw diagrams to show the contents of packets/frames at layer 4, layer 3 and layer 2 for both computer A and computer D.
Describe the data encapsulation process performed at layer 4, layer 3 and layer 2 in computer A.
If the logical destination address, D, is corrupted during data transmission, what happens to the packet?
The data link layer can detect errors between hops. Explain why other error control mechanisms are still required at layer 4.

6.Why can the use of TCP in conjunction with IP ensure the proper message delivery to the destination?

7.ATM uses switches to route cells from a source endpoint to a destination endpoint. A switch routes the cell using both the VPIs and the VCIs. A representative ATM switch and its switching table are given in the figure below, where an incoming cell with a VPI of 153 and a VCI of 67 arrives at switch interface 1. Based on the figure, work out the VPI and VCI of the outgoing cell and the corresponding outgoing switch interface number.

8.What are the main differences between two primarily used protocols: TCP and UDP?

9.How does packet switching work? What are the main differences between connection-oriented packet switching and connectionless packet switching?

10.Explain whether or not a routing table in a connectionless packet switched network can have two entries with the same destination address.
Can a switching table in a connection-oriented packet switched network have two entries with:
i) the same input VPI?
ii) the same incoming VCI?
iii) the same incoming VPI and VCI pair

11.What are the main differences between packet switching and circuit switching? Transmission of information in any networks involves end-to-end addressing and sometimes local addressing (such as VCI). For various networks at different communication stages such as setup, data transmission and teardown, complete the unshaded sections of the table below using one of the two addressing mechanisms including end-to-end and local.

Network Type
Communication Stage
Data Transmission
Circuit switching

Connectionless packet-switching

Connection-oriented packet-switching

12.In a Frame Relay network illustrated below, a virtual connection (dashed line) is established between A and B. Show the Data Link Connection Identifier (DLCI) for each link.

13.Compare the characteristics of packet switching networks including X.25, Frame Relay and ATM in terms of payload error control, latency, packet size, data transmission capacity and types of traffic supported.

14.Describe the functionalities of each layer of the ATM standard.

15.The ATM Adaptation Layer (AAL) of the ATM standard is defined to have four versions to support various types of communications. The diagram given below shows the AAL3/4 version and the structures of corresponding headers and trailers at various sub-layers. Based on the figure, answer the following questions:

i)If there are 47787 bytes of data coming into the Convergence Sub-layer (CS), how many padding bytes are required? How many data units are passed from the Segmentation and Reassembly (SAR) sub-layer to the ATM layer? How many ATM cells are produced?
ii)Work out the minimum number of ATM cells may be produced from an input packet, and work out the maximum number of ATM cells may be produced from an input packet.

16.What are the main differences between baseband and broadband transmission in LANs. For tree, bus, ring and star topologies, name the topology (or topologies) commonly used in broadband and baseband LANs.

17.Draw four diagrams of the most common LAN topologies. Explain briefly how the Tree topology is configured and operated.

Sorry thats not the full assignment ,, i will try to upload it .
Added on 08.04.2016 15:15
please solve all these questions.

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