, , , , .
FDDI
FDDI ( Fiber Distributed Data Interface, ) . FDDI ANSI ( ANSI X3T9.5). ISO 9314, ANSI. .
, FDDI (100 /) . , .
, , . , , , , , . , , , ( , ). FDDI, , Ethernet Token-Ring.
FDDI , IEEE 802.5 (Token-Ring). . FDDI , . , , ( ) 200 / ( 100 /). - , ( Token-Ring).
FDDI.
- 1000.
- 20 .
- 2 .
- ( ).
- .
- 100 / (200 / ).
FDDI . , Fast Ethernet, 100 /, FDDI . FDDI CSMA/CD .
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20 , . (2 ) ( 11 ). , 45 , 200 .
FDDI (CDDI Copper Distributed Data Interface TPDDI Twisted Pair Distributed Data Interface). 5 RJ-45. 100 . . , FDDI. FDDI , .
8.1. 4/5 | |||
4/5 | 4/5 | ||
FDDI 4/5 (. . 8.1), . . 4/5 100 / 125 ( 125 ), 200 , . ( ) . . , NRZ . NRZI ( TPDDI) MLT -3 ( FDDI).
FDDI :
- () ( , DAS Dual-Attachment Stations) ( ) . 200 / ( ). .
- () ( , SAS Single-Attachment Stations) () . , , . , .
(, ..) (Wiring Concentrators), , . (, ) . (DAC Dual-Attachment Concentrator) (SAC Single-Attachment Concentrator).
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FDDI . 8.1. . 8.2.
. 8.1. FDDI
FDDI (. 8.2):
- A , () , () .
- B , () , () . A B, A.
- M (Master) . M S.
- S (Slave) ( ). S M.
DAS SAS, DAC . 8.2. SAS S SAS.
. 8.2. FDDI
FDDI (. 8.3).
, ( DAS , SAS). Token-Ring.
. 8.3. FDDI
() FDDI (bypass switch). . . , (. 8.4).
, ( 2,5 ).
, IEEE 802.5, FDDI . Token-Ring () , FDDI ( , ETR Token-Ring). :
1. , , , .
2. , . , , .
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3. .
4. -, , , , .
5. , . , , .
. 8.4.
FDDI , Token-Ring. .
, (TRT Token-Rotation Time) () (T_OPR).
, T_OPR, , , , , , . (T_OPR TRT).
, T_OPR, , , .
T_OPR .
.
. , 20 1000 1,617 .
(. 8.5) (. 8.6) FDDI , Token-Ring.
. 8.5. FDDI
. 8.6. FDDI
:
- (Preamble) . 64 , , , .
- (SD Start Delimiter) .
- (FC Frame Control) ( , / , , ).
- (SA Source Address DA Destination Address) 6- ( Ethernet Token-Ring) 2-.
- (Info) ( 0 4478 ). () .
- (FCS Frame Check Sequence) 32- (CRC).
- (ED End Delimiter) .
- (FS Frame Status) , ( Token-Ring).
FDDI (. 8.7):
- : .
- , (6- 2-) .
- ( ) , .
- ( ) , ( ).
. 8.7.
, FDDI , ( ). FDDI , (Backbone) , . FDDI , . , Fast Ethernet FDDI, , FDDI . , , FDDI (TPDDI). FDDI .
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100VG-AnyLAN
100VG-AnyLAN , . Hewlett-Packard IBM IEEE 802.12, .
, ( Ethernet 10BASE -T), , Ethernet Token-Ring.
100VG-AnyLAN 100 100 /, VG 3 (Voice Grade), AnyLAN ( ) , .
100VG-AnyLAN:
- 100 /.
- (). () 5.
- , (Demand Priority ).
- ( UTP 3, 4 5), ( UTP 5), (STP), . .
- 100 ( UTP 3), 200 ( UTP 5 ), 2 ( ). 2 ( ).
- 1024, 250.
, 100VG-AnyLAN Fast Ethernet. Fast Ethernet Ethernet ( 100VG-AnyLAN ). , 100VG-AnyLAN, ( Ethernet), .
100VG-AnyLAN . 8.8.
. 8.8. 100VG-AnyLAN
100VG-AnyLAN (, ) 1, , 2, 3 .. ( ). 1000 .
(, Ethernet, Token-Ring, FDDI), 100VG-AnyLAN , . , . , . , - , . .
Ethernet Token-Ring. - . Ethernet Token-Ring , .
( ) ( ). ( ), , , , . .
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:
- , , , .
- , , , . ( ).
100VG-AnyLAN .
, , . , , . . , , . 100VG-AnyLAN, :
- ;
- , .
() , (). , , . , . , , .
, . , . 200300 ( ). , .
, , . ( ), , .
, . 8.9 () : 1-2, 1-3, 2-1, 2-4, 2-8, 1-6. () . , , 1-2, 2-4 2-8 , : 1-2, 2-4, 2-8, 1-3, 2-1, 1-6.
. 8.9.
MAC- , . , . , . , () . .
(Link Training), . , : 24 , . , , , . , .
100VG-AnyLAN .
:
- ( 5 ).
- , (scrambling) .
- 5/6 ( , ).
- .
4 ( ). .
, , , .
30 / (. 8.10). 120 /. 5/6 100 /. , 15 . 3 ( 16 ).
. 8.10. 100VG-AnyLAN
100VG-AnyLAN : .
( ). .
(1 4) , (2 3) . .
. 16 16 , 30 / ( 0,9375 ). (1,875 ) . .
8.2 , .
, , ( 11). , 12. . (12), , . 21. , 22 , (Link Training).
8.2. | ||
1 1 | ||
1 2 | ||
2 1 | ||
2 2 |
, 100VG-AnyLAN 100 /. , . , FDDI, . , 100VG-AnyLAN .
100- Fast Ethernet, 100VG-AnyLAN UTP 5 ( 200 ), .