FDDI (Fiber Distributed Data Interface) Token Ring, . FDDI :
100 /;
- , , , ..;
, .
: , .
FDDI :
- - 1000;
- - 20 ;
- - 2 ;
- - ( );
- - ;
- - 100 / (200 / );
FDDI , . - FDDI, , , . (Primary) , Thru - "" "". (Secondary) .
- , (, ), ( 5.1), . Wrap, "" "" . / FDDI. , - . - , .
FDDI , , . FDDI . .
. 5.1. FDDI
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FDDI , . Token Ring ( ) - token ring ( 5.2, ).
, - ( 5.2, ). , , , - Token Holding Time (THT). THT . , . FDDI (upstream neighbor) (downstream neighbor), .
. 5.2. FDDI
. , . ( 5.2, ). , , , , .
, , ( ), FDDI (, IP), ( 5.2, ). : , .
, . , , , , , , , ( 5.2, ). , . FDDI, .
5.3 FDDI OSI. FDDI (MAC) . , FDDI 802.2 (LLC), IEEE 802.2 ISO 8802.2. FDDI LLC, - .
. 5.3. FDDI
: PHY (Physical), PMD (Physical Media Dependent). SMT (Station Management).
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PMD . :
62.5/125 ;
(optical bypass switches) ;
MIC (Media Interface Connector), ;
1300 , ;
NRZI.
TP-PMD MLT-3. PMD TP-PMD , Fast Ethernet.
PHY , MAC- PMD, . :
4B/5B;
;
125 ;
.
MAC , . :
;
;
;
;
32- .
SMT FDDI. FDDI. SMT . SMT :
;
;
;
.
FDDI SMT : PHY , , - , MAC - , , .
FDDI Ethernet Token Ring.
FDDI | Ethernet Token Ring | |
100 / | 10 / 16 /c | |
/ / | ||
CSMA/CD | ||
, | , , , , | |
( ) | 200 (100 ) | 2500 1000 |
2 (-11 dB ) | 2500 100 | |
500 (1000 ) | 1024 260 , 72 | |