.16.1 Gigabit Ethernet. Fast Ethernet, Gigabit Ethernet , - , , 1000Base-LX/SX/CX 8B/10B, , 1000Base-T TX/T2. PCS, GMII.
16.1. Gigabit Ethernet, GMII Gigabit Ethernet
GMII . GMII (gigabit media independent interface) MAC . GMII MII 10, 100 1000 /. 8- , , . , GMII , (clock signal), - ( ON) , ( ON) - . , , , , Gigabit Ethernet GMII .
PCS. 1000Base-X, PCS 8B10B, ANSI X3T11 Fibre Channel. FDDI, 8 , , 10- (code groups). 10- . , ( Gigabit Ethernet 512 ). 1000Base-T, PCS , UTP Cat.5 100 - TX/T2, Level One Communications.
- - .
PMA PMD. Gigabit Ethernet , 5, . PMA PCS , () PMD. PMD / . 4 , 802.3z (1000Base-X) 802.3ab (1000Base-T), 16.2.
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802.3z :
- - ;
- - 62,5/125;
- - 50/125;
- 75 .
16.2. Gigabit Ethernet
. - , : 1300 850 . 850 , , , 1300 , , 850 , 1300 . , Gigabit Ethernet.
802.3z 1000Base-SX 1000Base-LX.
850 (S Short Wavelength, ), - 1300 (L - Long Wavelength, ).
1000Base-SX 62,5/125 220 , 50/125 - 500 . , , 220 4400 bt, 4095 bt . 100 . 220 500 , 160 500 /. , 600 1000 /. 800 .
. 1l000Base-LX 1300 .
1000Base-LX - . 5000 .
1000Base-LX . - 550 . . .
. (Twinax) 150 (275 ). , . . . , - Quad-. 5 . 25 , , .
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1000Base-X
1000Base-X Fibre Channel. Fibre Channel - , , . Fibre Channel 4- . FC-0 ( ) FC-1 (/) Gigabit Ethernet. Fibre Channel , Gigabit Ethernet.
8B/10B 4B/5B, FDDI. 4B/5B Fibre Channel, . , "1" ( ), "0" ( ), .
1000Base-X , .
1000Base-SX 770-860 , -10 0 , ON/OFF ( / ) 9 . -17 , 0 ;
1000Base-LX 1270-1355 , -13,5 -3 , ON/OFF ( / ) 9 . -19 , -3 ;
1000Base-CX (STP "twinax") .
.1 - , Hewlett Packard 1000Base-SX ( HFBR-5305, =850 ) 1000Base-LX ( HFCT-5305, =1300 ).
1 - Gigabit Ethernet
100Base-SX =850 | 100Base-LX =1300 | |||
min | max | min | max | |
, C | ||||
, V | 4,75 | 5,25 | 4,75 | 5,25 |
, | -10 | -4 | -13 | -3 |
, | -0 | -17 | -3 | -20 |
/ , | - | - | ||
, | - | 0,85 | - | |
/ , | - | 0,26 | - | 0,45 |
1000Base-X .2.
2. - Gigabit Ethernet
/ | ( ), * | *, | |
1000Base-LX ( 1300 ) | (9 ) | - | 5000** |
(50 )*** | |||
(62,5 )*** | |||
1000Base-SX ( 850 ) | (50 ) | ||
(62,5 ) | |||
(62,5 ) | |||
1000Base-CX | : STP 150 | - | |
* - (25 ) . ** - , / 100 . *** - |
8B/10B 1250 /c. , 625 . . 2 , 2-6 . - Gigabit Ethernet, . , . . , NBase Gigabit Ethernet, 40 ( DFB , 1550 ).
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- , 62,5/125 50/125. , Gigabit Ethernet . 1000Base-SX 1000Base-LX , .
( 30-50 ). . . . Gigabit Ethernet , - 1250 , - 0,8 . , , 622,08 /c (STM-4, c 8B/10B 777,6 ).
Gigabit Ethernet , . , . . , ( ), . , , , , , . DMD. , (.16.3). , : , ( ) . , DMD , , . , ( 1300 ).
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. 100- , DMD.
16.3. :
) (DMD) ;
)
1000Base-LX. , Gigabit Ethernet - , . - , , , (.2). MCP (mode conditioning patch-cords), ( , ) . , - Duplex SC , - Duplex SC, : MCP Duplex SC - Duplex SC. , Fast Ethernet, - MCP Duplex SC. MCP . . , . MCP , 10-15 (.16.3,). , 1000Base-LX , .
1000Base-SX. 1000Base-SX , , .
1000Base-T
1000Base-T - Gigabit Ethernet 5 100 . , 250 /c. , , - (dual duplex). 1000Base-T. 1 / UTP cat.5 , , 100Base-TX. , . 1000Base-T, : 5- - PAM-5; QAM-25, . PAM-5, .
. 4 - 00, 01, 10, 11. , 2 , 125 250 , (.16.4), . . . 6 /.
16.4. 4- PAM-4
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. , . .
PAM 5 5 . . ( - 00, 01, 10, 11). .
PAM 5 5 . . ( - 00, 01, 10, 11). .
, . / 6 .
PAM 5 1000 Base T Gigabit Ethernet. 1000 / 125 .
? . , 250 /. PAM 5 62,5 . 1000 Base-T 125 .
, 5 100 . 1000 / 4 ( , l00VG-AnyLAN).
250 /. , 100 . , .
802.b .
5, 5 : -2, -1,0, +1, +2. 2,322 . , 250 125 . , 8 ( 4 ), 1000 / , 5 54 = 625 , 8 , 28 = 256 . . 5 125 100 5.
802.3b , ISDN. 4- , 5 (. 16.5). ( , Ethernet).
16.5. UTP 5
. , - DSP (Digital Signal Processor). , ISDN .
, - .
MAC
MAC Gigabit Ethernet CSMA/CD Ethernet Fast Ethernet. ( ) .
Ethernet IEEE 802.3 64 . ( ). , - - 512 BT 51,2 . Ethernet , , RDT 512 BT ( ).
Ethernet Fast Ethernet , 64 - 512 bt 5,12 ( Fast Ethernet 1 bt = 0,01 ). , , :
- , ( ),
- , ( ), .
Fast Ethernet , Ethernet. , .
Gigabit Ethernet , Ethernet Fast Ethernet. , . , 20 , . , Gigabit Ethernet . Gigabit Ethernet 4096 bt 8 Ethernet Fast Ethernet. , Ethernet Fast Ethernet, , , " ".
(carrier extension). , " ". , .
( 512 ) , - , 512 . . . LLC . 512 , . 16.6 Gigabit Ethernet .
16.6. Gigabit Ethernet
(Packet Bursting). - , Fast Ethernet, . . 448 (512-64) . Gigabit Ethernet NBase Communications . , , . / , 512 , . 96 bt, - , (.16.7,). , , . , 1518. , , , , , , (.16.7,).
Gigabit Ethernet: , , , . (1000Base-FL, 1000Base-SX) Duplex SC. 1 , , , , - .
.16.7 :
) ;
)
Gigabit Ethernet. PCI, SBus . G-NIC, Packet Engines:
- 33 2 /;
- , ,
- IEEE 802.3x IEEE 802.3z .
. Ethernet , , MAC. RJ-45 (10Base-T, 100Base-TX) , - , . Gigabit Ethernet , - . CSMA/CD , . - , (.16.8). . , , MAC . , , ( ). CSMA/CD, .
, - . , , 100 .
16.8. Gigabit Ethernet
, , . (frame based flow control), 802.3x. MAC .
, , .
. Gigabit Ethernet:
- ;
- IEEE 802.3x;
- Ethernet, Fast Ethernet;
- ;
- 3;
- QoS RSVP;
- IEEE 802.1Q/p .