PHY MAC-, (TX FX) . , PHY , , , MAC.
100Base-FX 1.8.
15.6. PHY FX
Fast Ethernet , FDDI. FDDI, , (Rx) (Tx).
PHY FX PHY TX , PHY FX/TX.
4B/5B
10 / Ethernet . 4B/5B FDDI, PHY FX/TX. 4 MAC- ( ) 5 . . , , , . , - : , .
4- , , 4- 5- . . MAC- 100/c, 4B/5B 125 /c, PHY 8 .
32 5- 16, 16 4/5B .
FX/TX , 10Base-T, . Idle (11111), , , ( 1.9).
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15.7. Idle
, PHY FX/TX.
Ethernet Idle Start Delimiter ( JK), Idle T ( 1.10).
15.8. PHY FX/TX
5- NRZI
4- MAC- 5- PHY , . PHY FX PHY TX - NRZI MLT-3 . FDDI ( PMD) ( TP-PMD).
NRZI - Non Return to Zero Invert to ones - . , Non Return to Zero (NRZ), 1 0 . NRZI , , , ( ). 1, , . 0, .
NRZI , , , . 4B/5B , . 15.9 NRZ NRZI.
15.9. NRZ NRZI
NRZI NRZ 1 0 .