DataCom exam4 - STUDENT ID NO MULTIMEDIA UNIVERSITY TM I I...

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STUDENT ID NO MULTIMEDIA UNIVERSITY I I I I I I I I III TM MULTIMEDIA UNIVERSITY THIRD TRIMESTER EXAMINATION, SESSION 2004/05 ECP2056 - DATA COMMUNICATIONS AND COMPUTER NETWORKING (EE, CE, ME, TE, MCE, BMM) 12 APRIL 2005 9:OOAM - 11 :OOPM (2 Hours) INSTRUCTION TO STUDENT 1. 2. 3. This Question paper consists of 10 pages including cover page with 7 Questions only. Attempt any TWO out of THREE questions from SECTION A and any TWO out of FOUR questions from SECTION B. All questions carry equal marks and the distribution of the marks for each question is given. Please print all your answers in the answer Booklet provided.
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JX‘P2056 DATACOMMlJNICATIONS&COMPUTERNkTWORKIN(i APRIL2005 ____- SECTION A (Choose 2 out of 3 from this section) Ouestion 1 (a) Suppose a file of 20,000 characters is to be sent over a communication line at 9600 bps. 0) Assume each. character is made up of 8 binary bits, and one start bit, two stop bits and one parity bit are used. Calculate the overhead in bits and time using asynchronous communication. [2 marks] (ii) Calculate the overhead in bits and time using synchronous communication. Assume that data is sent in frames. Each frame consists of 1000 characters or 8000 bits, and there are 48 control bits per frame. [2 marks] (iii) Comment on the results in Ql (i) and Ql (ii). [2 marks] (bj Synchronous transmission. (i) What is the main problem faced by a receiver when the data stream is encoded using AMI (Alternate Mark Inversion) coding scheme? [4 marks] (ii) In DPLL-based synchronous transmission systems, a bit stream of 11000011000000001 is to be encoded using the following schemes: AMI, B8ZS, and HDB3. Sketch the wa.vefomls. [6 marks] (c) In an engine management system, the sixteen binary messages 0000 through 1111 are to be transmitted over a communication hne, Each message is to be protected by a 3-bit CRC generated using the polynomial: ,;u? -+ _rc-? -t- 1. Derive the transmitted frame bits for each of the following messages: (i) 0000 (ii) 1010 (iiij I I1 1 Assume the left-most bit is the MSB. 19 marks] Continued. ..
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ECP2056 DATACOMMUNICATlONS&COMPUTERNETWORKING APRIL2005 Ouestion 2 Describe EIGHT (8) important signals (pins) used in EWRS-232 to ensure correct transmission of data.
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This note was uploaded on 08/27/2009 for the course FET etm taught by Professor Hi during the Spring '09 term at Multimedia University, Cyberjaya.

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DataCom exam4 - STUDENT ID NO MULTIMEDIA UNIVERSITY TM I I...

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