Higher Colleges of Technology
Engineering Technology Department
| Telecommunication II
| Course Code
| EELX N307
| Project Title
| Project 4:ATM
| Due Date
| Date Submitted
% of final grade
| Student ID(s)
Declaration: Individual 1. No part of this assignment has been copied from another source, (not from another group or student, an internet source or a book) 2. When another person’s words are used, this is shown in the text with “…” and referenced. 3. No part of this assignment has been written by anyone 4. I have a copy of this assignment that I can produce if the first copy is lost or damaged. Name:……………………………………………………… Signature ………………………
N.B. The marker may choose not to mark this assignment if the above declaration is not signed. * If the declaration is found to be false, appropriate action will be taken. * Plagiarism is copying and handing in someone’s work as your own. Any student found guilty of this type of cheating will be dismissed from the college. Received By………………………… Date ……………………………
Project 4: ATM
In this project, you will examine the effect of ATM adaptation layers and service classes on the performance of the network. You will set up an ATM network that carries three applications: Voice, Email, and FTP. You will then study how the choice of the adaptation layer as well as the service classes can affect the performance of the applications. You will prepare a report that includes the answers to the questions, given on the last page, as well as the graphs you generated from the simulation scenarios. You will also discuss the results you obtained and compare these results with your expectations.
Asynchronous Transfer Mode (ATM) is a connection-oriented, packet-switched technology. The packets that are switched in an ATM network are of a fixed length, 53 bytes, and are called cells. The cell size has a particular effect on carrying voice traffic effectively. The ATM Adaptation Layer (AAL) sits between ATM and the variable-length packet protocols that might use ATM, such as IP. The AAL header contains the information needed by the destination to reassemble the individual cells back into the original message. Because ATM was designed to support all sorts of services, including voice, video, and data, it was felt that different services would have different AAL needs. AAL1 and AAL2 were designed to support applications, like voice, that require guaranteed bit rates. AAL3/4 and AAL5 provide support for packet data running over ATM. ATM provides QoS capabilities through its five service classes: CBR, VBR-rt, VBR-nrt, ABR, and UBR. With CBR (constant bit rate), sources transmit stream traffic at a fixed rate. CBR is well-suited for voice traffic that usually requires circuit switching. Therefore, CBR is very important to telephone companies. UBR, unspecified bit rate, is ATM’s best effort service. There is one small difference between UBR and the best-effort model. Because ATM always requires a signaling phase before data is sent, UBR allows the source to specify a maximum rate at which it will send. Switches may make use of this information to decide whether to admit or reject the new VC (virtual circuit).
Create a New Project
1. Start OPNET IT Guru Academic Edition - Choose New from the File menu. 2. Select Project and click OK - Name the project <your initials>_ATM, and the scenario CBR_UBR - Click OK. 3. In the Startup Wizard: Initial Topology dialog box, make sure that Create Empty Scenario is selected - Click Next - Select Choose From Maps from the Network Scale list - Click Next - Choose USA from the maps - Click Next - From the Select Technologies list, include the atm_advanced Model Family as shown in the following figure- Click Next - Click OK.
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