ENE 422 Data Communications

(1)

D

~11', ENE 422 Data Communications

A A A " A _§ f': .:td

n,ft'l!fTlA''lO"i'nJmann·rn'M.mma:::L't1"ifl3J'M.,ft3J iln

3 section 2

"' ..I

t'lel1J 1~~1i'YI 3 <;1~11-lll ~-"'· 2561

na,

9:00 - 12:00 '"·

'I,, A ..t.... .., IV

1. '1HlH1lU1"1!1'1.UJ 22 '1111 8 'VIU1

2. him•onc;iliihwil'.;ii111h:n11um1L1tJi.uii1i11-:1H11u

3. il'M.011c;}li'lhunH1'i A4 ,i1u1u 2 LLe-iU L'IJ1i1l-:JH1lULi LLfl:i11-:ia.;ifiwl-:i 2 LLe-iWYfl1llJfl'IJ'IJ1lH1l'IJ 4. ii1£1.;iluii11H11rn'Yi1ifu

5. la.io'M.ru1c;i

1

iKihLfl~1).;Jf11U 1tu.L'IJ11' 1).;Jff1)'1J 6. la.io'M.ru1c;i l i'll1"r'l,!U1Un1lJL"li1i11.;iH1J'IJ

... ... ,:I O ... • ..,

7. 'V11lJUni'lmflU1'111JH1JU1J 1Jnu11nV111.;iH111J

Iii, La owlii, u ":::",

• L~oi:.nfln1t1m110 ffillJLff~,iio-1 uni'.iou on m'i&1m'iA&1ffot1 L

. Yi

011 o o'M.ru1c;ioon"o nio-1ffot1

.

^.,

., .,

..

'111lH1lU'V\U1'Yl 2 3 4 5 6 7 8

39 25 35 30 37 34 30 230

~e1-a11a ... "iMffin~n:Y., ... .

.=a - ... ... ....

1

'iA'. c;i-s. L'iil'1'ii1'1 "!ilffll'i:: ~ilil011ilffiltl ( 'Yl'i: 9060)

ifo ff ii uifli U1'M, n1'i1.h::L3J'M,';)1 nAm:::n'i'i3J 01'it.h::,11mA1'.111LLa'l

7 ...

(2)

.a ^QJ ^0.1.d

'lf'O-ffQ'1 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ '.i'Hff'UflfYfl'Hl _ _ _ _ _ _

1. n1,rn~ i1-h::i1Jfftyty1wi~11i'W11h.nnn (20 fl::;!l'U'U)

a. \M1l~ffWWlW'Utl-:J 01010101 1~uiiManchester scheme _.,_.,

b. \l-:J1Jt1fl'Ut1~1m::;'Ut1lffU'Utl-:J Manchester scheme

c.11-:i11~tYWWlW'Utl-:J 01010101 hm1i'MLT-3 _{., .,}

j/ d j/ d

d. 11-:i1Jt1fl'Ut1~1m::;'Utll'i:YU'Ut1-:J ML T-3

2. (15 fl::;!l'U'\.!)

a. disparity controller iiii'r~titi::;i'.i _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

b. tiimuin disparity controller 'Utl-:J 8B6T _ _ _ _ _ _ _ _ _ _ _ _ _ _

c. tiimuin disparity controller 'Utl-:J 6B/1 OB _ _ _ _ _ _ _ _ _ _ _ _ _

3. \l-:J1Jtlflfl1111'11111U'Utl-:Jn'\'U 8 'Utl-:J 10B58 ( 4

(3)

A °" ^Q,I ~

'lftHYQcl _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 'HHY'Uflfffl'lll _ _ _ _ _ _

,,

4. Codewords 9i'fJi'lJuiifJt1HY1J'!ffil;~l~'\.l'\1l'fli11 l'W'il:::'fl:::i'i (5 fl:::U'U'U)

00000 0 10 11 1 0111 1 11 11

5. ~~flll!1Wfll 2-byte checksum 'll'fl~ 0x4567BA98CABF (5 fl:::U'U'U)

6. fll'l-11-!~

lir

^{data word}^11'Jl!¹⁰¹⁰⁰¹Ucl:::iTttl'i 11'Jl! 10111 M'l-11 codeword 'IJ'fJ~a~tY~

( 6 fl:::Ul!l!)

7. 'flnmuri111 node-to-node communication (4 fl:::Ul!l!)

' ,,

8. t1nmmnu1n111'1Ju (5 fl:::lll!l!)

Control 10 SREJ

(4)

I

^Control

I o Is•

⁹

10. Draw the window position and flow diagram between Node A and Node B by Selective Repeat ARQ using the frame numbers Oto 5 and the window size is 3 slots. (30 r1::u1rw)

- Timer for Frame 0 starts at the first request. Frame 0 is sent from Node A but lost.

- During waiting for the acknowledgment from Node B, Timer for Frame l starts at the second request. Frame 1 arrived to Node B safely.

- Draw what Node B has to do. At the same time, Timer for Frame 2 starts at the third request. Frame 2 arrived to Node B safely.

- After Node A received the frame, draw what node A has to do.

- After Node B received the frame, draw what node B has to do.

Node A NodeB

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.i:!t QI Q.J,-:S

'lH.H1'fJ"1 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 'HH1''Uf1flf11-,Jl _ _ _ _ _ _

11. ~'tl1Jfll01lJt~tnt11J Selective Repeat ARQ (15 fl~U'U'U)

a. '1'11Jflf117 Selective Repeat ARQ ~f111 Stop-and-Wait ARQ protocol edi.:i11

.A l'I d ,A l'l ., ., , • .I .J l'l. I t

b. '1'11Jflf11.:Jfl'U 1'1J'VlllJfl 1Hl1'J1Jll~ff.:itTIHl'IJ'U rn'lt'U network layer

12. (15 fl~U'U'U)

I

^Flag

I

^Address

I

^Control

I

^Protocol

I

^Payload

I

^FCS

I

^Flag

I

,, '

c. 'U'U~fl'Wvi~t1f111 network phase iiw:n:url1riqJ0d1.:ih

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a ^Q.I ^QI ⁴

'lfO-ffQcl _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ l'Vlff'Uflrrt1'tll _ _ _ _ _ _ 13. propagation time ll1lfl1J 3 µs !lei::: transmission time 1n1n'U 5 µs ffl.JlJ~11ii 2 stations

A 1rn::: B m1:::1~'I.Hl'll'll bus CSMA/CD (18 fl:::ll'U'U) a.

1J'j'jUlf.Jl~tnn1Jml'ii',11vJrn

- - - -

,,

b. l'i-nrn.:i stations ri.:i1vJnrnom.Jrn!t:11Jfl'U ll~cl::: station 11;:;ffllJl'.if.'l detect flll'lf'Ufl'U ,rn.:iivJrn 1;t11 lJ 111111.h~t:11li'm~Hm.h:::nt:11Jt11~01J

14. fflJlJ~i1ij 2 stations A 1rn::: B 1rn:::1~'Ull1J1J bus CSMA/CD l:::U:::Yll.:i'.i:::1111.:ifft:1.:i stations ll1lfl1J 2000 ^llJ~'j1m:::nm11J1~1fl~'U!Viifl1J 2 ^Xl 0⁸m/s t"i'1 station A 11:uri.:i~

11'111₁i1.hi~flt:1c1t11:::111' station B ri.:i1vJ'.i1J~11m 1₁+8µs11~t:11:u l'rn1:::t:1:::1'.i (6fl:::ll'U'U)

a. t"i'1H 1-p e r s i s t e n t - - - ~ - - - - b ,, , ,, .

. m 'If nonpers1stent _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

15. 11.:i1Jt:1flfft:1.:i1V1fl'Ufl~ CSMA/CD 1i1~t:1'111fll'.i'lf'Ufl'U'll~rnvJrn ( 4 fl:::ll'U'U)

16. t:1irnt1t1111 Token Ring MAC (5 fl:::ll'U'U)

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•

.A QI a.,,:!l

'lftHYfJ~ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 'HHY'Uflflfl1:ll _ _ _ _ _ _ 18. station AB 1rn:: C fi1rl'.:il!~'1'U'U!'li'1li medium (9 fl~ll'U'U)

a. fll'Hil11u11~1'U1'U slot lu contention window 1illi'U'uo.:iu~~~ station 'YJOOH11

b. 'il·rnnmu contention window flllll'it:l'lhu'hl'rvhlJ'i.:iflllJ station i1i1n11fllrn'U

mh:ih

19. 'il-:JOfi'lJlUflWfff 1-:i switching table (5 fl~ll'U'U)

20. (15 fl~U'U'U)

Preamble SFD Destination address

Source address

Type Data and Padding CRC-32

a. 'il-:J1JOfl'l1Ul~'\Jij,:j Type

v b ~ - - - -

b. Padding fiomnilo::11

- - - -

"' ,.I .I ' 'J) ,f 'J) ,f 'J) ⁰ 111

d. mmrtrnmnm111~01 t'.ilt~O'i'il~~o-:imo::; 11

- - - -

21. m1u1m~u1ti11 contention-free MAC sublayer'\J0'1 IEEE 802.11 wireless LAN (5 fl~U'U'U) _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

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~ Q,I a . , ~

'l10-ffQtl _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 'HHY'Uf1f'lft'lfl _ _ _ _ _ _

"

22. 'il.:i1rn'Ut11t.m.1~011H1 (30 i'l~uuu)

I

^FC

I

^D

I

Address 1

I

^{Address 2}

I

^{Address 3}^j^SC

I

^{Address 4}

I

^payload^j ^?

,,

c. 01tvlrnilt~'U RTS t'V'lrn address 1 ui1~ address 2 fio address o~1l

d. 'il.:i'l11ti1 D 'Uti.:it'V'lrn RTS 01it1-m1ni.:i data frame \i1u1u 1 rwrn ffl.ll,1;11

transmission time 'Utl.:i data t'nlf1'U 20µs Utl~'Uti.:i RTS, CTS, ACK t'nlfi'U lµs

tm~ SIFS t'\1lf1'U 0.5 µs Uri~ propagation time tl1lf1'U 10 µs

~111 ~ ' 111 ' ~I • .I "'

e. t'l'llJllOl i~mm inltlJ'l-HTirn RTS '11'rn CTS