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: : <2#( + # & 8 9 Livello Data Link 5/71 >. 3 5 5? 5 5 Livello Data Link 6/71 %
A & 8 9 & 8 9 '2 (?.2 ( 2 (.2 8 9 ; Livello Data Link 7/71 &.2 ('2.2 '2?/?/ 8B9 8B9?C 8:9) 869 Livello Data Link 8/71 @
&82 9 2 8 2 9?0 1 & /, &8( (9 &&?/(& &,, 0;1 /, &8 0&19 Livello Data Link 9/71 0..1. 89 ; & 8019&& &; $ & :,&&( & ; 8B9 &, && ; 8B9&&/ 8B9& 8:9 / 8B9 8:9 8B9&&/ 89 8:9& 8:9/ 8:989 Livello Data Link 10/71 D
+?C = -F = 869 (2 3 8 9 # < # < 8 9 >2 8G, &2 9 5 & >8G, & 9 5 H ' Livello Data Link 11/71 &? & :::IC t0-τ t0 t0+τ time Vulnerable Time J Livello Data Link 12/71 E
& #= L #= ; L? (n-1)τ nτ Vulnerable Time (n+1)τ time %EJ Livello Data Link 13/71 ( 89 M ( 3 ; F(?( 869(? L & 8 L 9M? ( 89. $ 8 :9#( ( $ ( ; 8 :9#( ( $ ( 8 :93 & ( L ( $ C "$ C 8:9(( M $ L ( $ L ( Livello Data Link 14/71 K
# & L L? L ; 2 3 & / A B C D Livello Data Link 15/71 >2 & C ( & 0#,&1 ( & ; M 82 9( 2 3? 48 & = 9 ;$ ; C 89M #( 8 & A? 49( M N Livello Data Link 16/71
Livello Data Link 17/71 > (!" + Q $ $ $ >.DE 8P9 8P9 >! (-D! K%. *!" 2# ' #-> - H - K E D @ % " Livello Data Link 18/71 O
#-8# -, 9!" #$% Livello Data Link 19/71 + # '8 9 #8((9.Q.Q *.Q.Q Livello Data Link 20/71!
!" (Local and Metropolitan Area Network) LLC MAC Interfaccia unificata con il livello network 802.3 802.5 ISO 8802.3 802.2 Logical Link Control ISO 8802.2 ISO 8802.5 802.6 ISO 8802.6 802.11 ISO 8802.11 CSMA/CD TOKEN DQDB CSMA/CA... RING Tecnologie trasmissive differenziate... LIVELLO NETWORK LIVELLO DATA LINK LIVELLO FISICO Livello Data Link 21/71!"& ### # 5 #-, 5 * 5 #- Livello Data Link 22/71
& &... E E @ 2 ##:23 * :2 : -' ' :2 2 : ''&? Livello Data Link 23/71 &E/? 8 $(! :!!:":@:!!: 9 8 :2 > :9 8 :2 9 + 8 :2 9 L ::::: Livello Data Link 24/71 "
* & 8 9 %+/ /A? & ( & 3 8 3? 9$ 3 &! :!!:":@:!!: L & 2?! :!!:"L? 2 Livello Data Link 25/71 * & (? 8'9 2 3 -' 8##9 5 + 5 2 L?&, & 8* 9?, 5 L, Livello Data Link 26/71 %
? #-(? 2 &L & &=?$#& & Livello Data Link 27/71 ##!"$"L ##$ 2 & ## = -, (A? H - N <2#8<&2 #9 ' A 8 Q(( 2 9#- Livello Data Link 28/71 @
## ##F &'(,." : (,.%(,... " ##:2 ##: -.* # -' *. - RS;$ = 2 3 3 238!%<9 ##?& 2 3 -' 8 ; 9 Livello Data Link 29/71 ##3 2 = $(!@"<!"$2 8.9 2 -.* # -'!@"<!@"< 3... Livello Data Link 30/71 D
-2 3 #= = 8 $((Q9& = =:::I- 8-, 9 2 3 8 3? 9B / #! < =- E!!% 2 N! O+ &. %K> Q!!!!!E * #=&.>L :::I 3!!!!!! <( / / &"$! 2 -.* # 3./ -'!<!<!<!<!%<!%<!!!!!!<!!!!!!<!!!!<!!< % " - Livello Data Link 31/71!"$% 3 = 666 Interfaccia unificata con il livello network LIVELLO NETWORK LLC MAC 802.3 802.5 ISO 8802.3 CSMA/CD 802.2 Logical Link Control ISO 8802.2 ISO 8802.5 TOKEN RING 802.6 ISO 8802.6 DQDB 802.11 CSMA/CA Tecnologie trasmissive differenziate...... LIVELLO DATA LINK LIVELLO FISICO Livello Data Link 32/71 E
!"$% T U & 2 ( Q;= V! C &!"$% #C L! >8!! 9 >2 -U& & 89(!! >8!"$%9 )>8!"$%(!"$%9! )>8!"$%9 G @! )>!!)>8!"$%9 Livello Data Link 33/71!"$% &"$! LIVELLO NETWORK LIVELLO DATA LINK LIVELLO FISICO Ethernet versione 2.0 LLC MAC 802.2 Logical Link Control ISO 8802.2 802.3 ISO 8802.3 CSMA/CD Ethernet V 2.0 di: Digital, Intel, Xerox CSMA/CD Standard ANSI/IEEE ed ISO/IEC Livello Data Link 34/71 K
& DECNET TCP/IP OSI LIVELLO 3 Ethernet V 2.0 LIVELLO 2 COAX CABLE + Manchester LIVELLO 1 Trama Ethernet V.2.0 Preamble SFD DSAP SSAP Type Data FCS Ottetti 7 1 6 6 2 da 46 a 1500 4 ( &) Livello Data Link 35/71 *!"$% DECNET TCP/IP OSI LIVELLO 3 LLC IEEE 802.2 LIVELLO 2 - LLC MAC IEEE 802.3 LIVELLO 2 - MAC LIVELLO 1 10BASE5 10BASE2 10BASET FOIRL 10BASEF Livello Data Link 36/71
' &!"$% Lunghezza compresa tra 64 e 1518 ottetti OTTETTI 7 1 6 6 2 da 0 a 1500 da 0 a 46 4 PREAMBLE SFD DSAP SSAP LENGHT DATA (LLC PDU) PAD FCS? M #& 2 '2?8!!! 9M = Livello Data Link 37/71 ' &!"$% Lunghezza compresa tra 64 e 1518 ottetti OTTETTI 7 1 6 6 2 da 0 a 1500 da 0 a 46 4 PREAMBLE SFD DSAP SSAP LENGHT DATA (LLC PDU) PAD FCS '&? 8/ * / 9 (& &L E@ Livello Data Link 38/71 O
!"$%: -!"$%>&& & (L =' 8 &"$! )9& Pacchetto 2 Pacchetto 1 Inter-Frame Spacing min 9.6 µs Livello Data Link 39/71!"$% 8 9 & L 8 69 # &!::! 8 9? 5 # &?? 8$(! >::I?$ S! <9 Clock Livello Data Link 40/71 "!
!"$% &$"$! Ethernet V.2.0 Preamble SFD DSAP SSAP Type Data FCS Ottetti 7 1 6 6 2 da 46 a 1500 4 Lunghezza compresa tra 64 e 1518 Preamble SFD DSAP SSAP Length Data PAD FCS Ottetti 7 1 6 6 2 da 0 a 1500 da 0 IEEE 802.3 a 46 4 Livello Data Link 41/71!"$%&W Livello 3 MAC Ethernet v.2.0 IEEE 802.2 Logical Link Control MAC IEEE 802.3 Fisico Ethernet v.2.0 Fisico IEEE 802.3 Pile di protocolli Ethernet e 802.3 Livello Data Link 42/71 "
./>#&W./>#& RSD!!./>#&S#& #L!"$%./ L 2 3 ##./>#&ID!!./>#&S./ #L &./ L Livello Data Link 43/71!"$% >2 L >2 :$ 3 $ 8 9 5 ( 5 ( ; 8A OE9( &L 8 C 9 "$ ( ( 8,& 9$( (8 9 5 ;? 4 8%"9 5 ; 8 9( = : ( E Livello Data Link 44/71 ""
!"$% >2 8$9 #U :L / ; : =: (.SP( L 8D" 9 L U! RSR"S8(! 9 Livello Data Link 45/71 >2 &X (L & *.2 / 2 N C #& & 2 & Livello Data Link 46/71 "%
2 ; 8#;9 $ 89 #F = & & * ;. + + 3 ; && =8 +9 8 /9 Y /!"$% &"$! & D"BE@ '2 :::I 8DKE>! 9SDK(Eµ Livello Data Link 47/71 2 ; 8#;9 $ 8$9 * / "5#;> S"5! >L C #; D(K7 5 #&; #- 3 01 #- 5 ( / ( = 8#; "9 # # <Z * 2 D(%µ #; "7 Livello Data Link 48/71 "@
*C * 3 = $ - -+3''*[[ '* 666 * * )? \ 8OE9 4 8&&9 F Stazione A Stazione B Data Link Fisico Fisico Ripetitore Fisico Data Link Fisico Livello Data Link 49/71!"$%! +:D(! +:"! +:D; 0&1(&; D!! (! +:"; &(&; D( -! +" = 666 ' *# 8 9! '#L = ' *# 8 "9 Livello Data Link 50/71 "D
!"$%8$9!+:.!"$% : 5. 8& 9 3 8.., 9 % 2 8 9(.Q*Q #&!! HUB HUB HUB Livello Data Link 51/71! +:. *\@D 1 2 3 4 5 6 7 8 Jack Position 89 ' N ( $.2B "$.2: %$ *2B @$ -3 D$ -3 E$ *2: K$ -3 $ -3 ( *+ $ *2B "$ *2: %$.2B @$ -3 D$ -3 E$.2: K$ -3 $ -3 ;!! - '$*& ( ( *+ ;!! ( (, Livello Data Link 52/71 "E
! +:. ; O! 10Base-T hub ;!! Architettura di interconnessione Livello Data Link 53/71 *!"$% # 89 @ D( % ] &@(' *# D!! ] &%(' *#!!! GG = 666 Livello Data Link 54/71 "K
& C Livello Data Link 55/71 '&:!"$%!"$% = >2!"$% &!"$% LIVELLO DATA LINK Modello architetturale di IEEE 802.3u CSMA/CD MAC LIVELLO FISICO PMA PMD PCS PCS 100BASE-T4 100BASE-T4 100BASE-T4 100BASE-T4 Reconciliation Sublayer PCS PCS 100BASE-T2 100BASE-T2 100BASE-T2 100BASE-T2 PCS PCS 100BASE-X 100BASE-X 100BASE-TX 100BASE-TX 100BASE-FX 100BASE-FX MII PHY MDI: Medium Dependent Interface MII: Medium Independent Interface PCS: Physical Coding Sublayer MDI PHY: Physical Layer Device PMA: Physical Medium Attachment PMD: Physical Medium Dependent Livello Data Link 56/71 "
'& N C 2!! > +!! $OEµ 2 89D$"µ "! D <3 +!! Livello Data Link 57/71!"$%!"! #!! $# $%&,%! '(!)!*+ Livello Data Link 58/71 "O
!! +:Q!!+:Q &!! +:.Q!! +: 'Q!! +:.Q3.8.9 $D #&!! 2 "! D 5 : *89^ *89:!! D!! 5 : *89^!! '& <!! #& W!!!! Livello Data Link 59/71!! +:Q8$9!! +:'Q & 8E"$D>"Dµ9 #& 5 < 2;: @" 5 '2;8 E@9 ^ "!!! 3 "E8EB!! 9 # # <Z!! '& < E Livello Data Link 60/71 %!
!! +:Q @+D+ @+>D+ & @8 9 & D."D > -..&.... MLT-3/NRZI $#/ &, #/ &, 0 1 1 0 0 0 1 0 1 0 0 0 1 0 1 0 0 1 1 1 0 1 0 1 0 0 1 0 0 1 0 1 0 1 1 0 @+D+ #.:% _ &? 8& 9??? Livello Data Link 61/71 )&!"$%!"$% 8 9!"$% ) 8) 9 LIVELLO DATA LINK CSMA/CD MAC LIVELLO FISICO 1000BASE-T 1000BASE-T Reconciliation Sublayer 1000BASE-SX 1000BASE-SX 1000BASE-X 1000BASE-X 1000BASE-LX 1000BASE-LX GMII: Gigabit Medium Independent Interface MDI: Medium Dependent Interface PHY: Physical Layer Device 1000BASE-CX 1000BASE-CX GMII MDI PHY Livello Data Link 62/71 %
)& & +)> + OE &8! '&9 >2( = "! $ - -3''-. <3 +!! )& &? ="!! Livello Data Link 63/71 )&!"$%; )&: ; 8 C L 9!"$%; # &!"$% C ':2 ; N & 8! >(!! >(G9!"$%;L )&( &'& Livello Data Link 64/71 %"
C C &> ; 5 C 5? $ )>: ; "$ )>&: ; %$!! >: ; @$!! >&: ; D$! >: ; E$! >&: ; Livello Data Link 65/71 )& Standard Mezzo fisico Utilizzo Max Codifica (banda passante per lunghezza) lung. 1000BASE-SX MMF 50/125 µm (400 MHz * Km a 850nm) 2 fibre 500 m FC: 8B10B '01+ MMF 50/125 µm (500 MHz * Km a 850nm) 550 m MMF 62.5/125 µm (160 MHz * Km a 850nm) MMF 62.5/125 µm (200 MHz * Km a 850nm) 220 m 275 m 1000BASE-LX MMF 50/125 µm (400/500 MHz * Km a 1310nm) 2 fibre 550 m FC: 8B10B '01+ MMF 62.5/125 µm (500 MHz * Km a 1310nm) 550 m SMF 10/125 µm 5000 m 1000BASE-CX Doppino attorcigliato schermato bilanciato 2 coppie 25 m FC: 8B10B '+ (jumper cable) 150 Ω 1000BASE-T Doppino attorcigliato non schermato 4 coppie 100 m PAM5 bilanciato 100 Ω Cat. 5 MMF = Multi Mode Fiber (Fibra ottica multimodale) SMF = Single Mode Fiber (Fibra ottica monomodale) Livello Data Link 66/71 %%
' % &'( 2..&# 2..&3# # $!" )* + Livello Data Link 67/71 LIVELLO DATA LINK! )&:!"$%!"$% C : ; - - >2 - ; LIVELLO FISICO 10GBASE-X 10GBASE-X (8B10B) (8B10B) MAC MAC Full Full Duplex Duplex Reconciliation ReconciliationSublayer 10GBASE-R (64B/66B) 10GBASE-R (64B/66B) WAN WAN Interface Interface Sublayer Sublayer (WIS) (WIS) 10GBASE-R 10GBASE-R 10GBASE-LX4 10GBASE-LX4 10GBASE-SR 10GBASE-SR 10GBASE-LR 10GBASE-LR 10GBASE-ER 10GBASE-ER 10GBASE-SW 10GBASE-SW 10GBASE-LW 10GBASE-LW 10GBASE-EW 10GBASE-EW XGMII PCS PMA PMD PHY MDI 6/ &&6, 7/47&%4 89/4341 /4 & /4 && #56/5% &6&&6, Livello Data Link 68/71 %@
! )& #-<Z 2! )> H -<Z 2 5 C #-> ->H - &8 :: 6669 C 8O$E)>9? :O"8& -.9. :E@ 8&2 <9!) -H -8 -.>2 <9 -H - 5. -.>2 < Livello Data Link 69/71! )& $%," - )*.#$/ #.0 2 1&%2 3")).5&'..& /..0 4 1&%2 3/4 6,.5&'..& 1&%22 3/4 56,.5&'..&.#$ / 1&%275 / #50 2 3")) 4-18&& 3/4 6, 1&%29.#$/ #.0 /..0 1&%29 3/4 1&%229 3/4 = 2 3")) 4 6, 56,.5&'..& :2';< ).5&'..& :2';< ).5&'..& :2';< ) 1&%2(: 1:..&1;0&<&(3../( 7/=>!( Livello Data Link 70/71 %D
@! )&(!! )&!"$% C : ; &!"$% Livello Data Link 71/71 %E