Question

4) (2 pts) Chapter 2 Text Book Problem 8 Suppose you want to send some data using the BISYNC framing protocol and the last 2 bytes of your data are DLE and ETX, What sequence of bytes would be transmitted immediately prior to the CRC? 5) (2 pts) Chapter 2 Text Book Problem 18 Suppose we want to transmit the message 11100011 and protect it from errors using the CRC polynomial x +1. (a) Use polynomial long division to determine the message that should be transmitted. (b) Suppose the leftmost bit of the message is inverted due to noise on the transmission link. What is the result of the receiver's CRC calculation? How does the receiver know that an error has occurred?

Answer 1

SupPose ou wat to send Some data ing the BTSYNC Tam ind frotocs Onthe Lagt 2bytes of You data hat Sezuences DLE ondTx 1 bYtes would be transmitted immelely Prio to the CRC > DLE DLE DLE ETX ETx (Answer)

a) Data 1 11 oo o11 CRC Polt omiul3+1 1o o 1 4 bit n+0.+1 FiTst we adeled to data bit with 3 o's 3 o's because Poltnomial bit 1 1. o o 11o o in Put ht Paddel bt 3 bit NOwIt divides by 4 bit PoLYnomiebi (CReiaererater) ) 111 1 1 1001 11 1 o 11 1 o 0 1 11 1o 1 11 o O o 11 1 1 10/0 1 ipa310 1 0,0 1 O remainder 3 bts)

Ine mesult or 4hat itera£ion rs the bitwise xoR ot the o Y nomat divison with the bit alove it Tne messade is 1 1 1 o o o 11 10 o that NShoul be trursmi tted. Suppose the (est most bit 6 the messase in in verted due to moise on the transmitted ink New fNLd messase be O 1 1o o o 1 1 10 0 which is Teceived by the Tecewer Tne validit of a Tecejvel messase Can eagi1y be veriticl bt Fersormns the above Calculut isn agajn,with the Same CRC Genenator

this time with the Check Velue added imSbead of 2eroes. The remajn der Should eual zeo is there are n6 de tectal te exTorS NOw aa;n we CoCulate at Teceiver side with same CRC Cneneraton on New mess ae 101110 10 01 o 1 11 o o 1O o 101 o O 1 1 1 O O 1 1 1 1 1 O o1 110 1 1001 1o o 1

.he vesult o the veceve's CRC Calculation, the remainler S mon 2ero. Receiver assumeg thut Some erroT Occurrel tn the data t during trans mSsion Receiver ejets the data and aKsthe senden for retoansmisS

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