Fast Ethernet IEEE 802.3 , Transmission System Model 1 Transmission System Model 2. , .
, :
- , ( ), 100 ;
- , , 412 ;
- , 50 .
1, ( ) (.. , ). , ( , ), , 100 , . . .
2.1
Fast Ethernet
() | T4 FX | TX FX | ||
( ) | ||||
I | 260,8 | |||
II | 308,8 | |||
II | 216,2 |
, , II, : . , , 5 , , (. 8.13). , 205 .
FastEthernet |
.
() . , . 2.
2
( ) | ( ) | |
TX/FX | ||
T4 | ||
T4 TX/FX | ||
3 | 1,14 | 114 (100 ) |
4 | 1,14 | 114 (100 ) |
5 | 1,112 | 111,2 (100 ) |
1,112 | 111,2 (100 ) | |
1,0 | 412 (412 ) | |
() I | ||
() II TX/FX | ||
() II T4 |
|
|
() , 2. , . , , ( ) (), . , 512 .
!!! Ethernet 10 /, 802.3 . . , , , . , , , , 512 (bt), .
, .2.
, . , ( NVP Nominal Velocity of Propagation). : t=1/(3108NVP), t - . , NVP=0,4 (40%) , t 8,34 / 0,834 . () t .
3 NVP .
3
NVP | |||
AT&T | 0,67 | ||
AT&T | 0,70 | ||
AT&T | 0,70 | ||
AT&T | 0,70 | ||
AT&T | 0,75 | ||
AT&T | 0,75 | ||
Belden | 1229A | 0,69 | |
Belden | 1455A | 0,72 | |
Belden | 1583A | 0,72 | |
Belden | 1245A2 | 0,69 | |
Belden | 1457A | 0,75 | |
Belden | 1585A | 0,75 |
, 2, .