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1. Show the NRZ, Manchester, and NRZI encodings for the bit pattern shown in

Figure 2.36. ssu!e that the NRZI signa" starts out "ow.

2. Show the #$%&$ encoding, and the resu"ting NRZI signa", for the fo""owing bit

se'uence(

a) 111* *1*1 **** **11

b) 11*1 111* 1*1* 11*1 1*11 111* 111* 1111

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ssu!ing a fra!ing protoco" that uses bit stu+ng, show the bit se'uence

trans!itted oer the "in- when the fra!e contains the fo""owing bit

se'uence(a) 11*1*11111*1*111111*1*1111111*

11*1 *111 110* 1*11 11101*1* 1111 1011 *

b) Mar- the stued bits.

3. Suppose /ou want to send so!e data using the $IS0N fra!ing protoco" and

the "ast 2 b/tes of /our data are 4 and 45. 7hat se'uence of b/tes wou"d

be trans!itted i!!ediate"/ prior to the R8..., 4, 4, 4, 45, 45

#. ssu!e that a S9N45 receier res/nchroni:es its c"oc- wheneer a 1 bit

appears; otherwise, the receier sa!p"es the signa" in the !idd"e of what itbe"iees is the bitone 5M ce""=?=1*) @ about =*** fra!es%sec, or about #=*,***

fra!es%!inute. 5hus, if station $

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four bits change and no error is detected, then the bad bits !ust for! a

rectang"e( in order for the error to go undetected, each row and co"u!n

!ust hae no errors or eCact"/ two errors.