: Ethernet, Token ring, FDDI
Carrier Sense Multiple Access Collision Detect (CSMA/CD)
.
Ethernet/2 IEEE 802.3 ,
Ethernet' 3 :
10baseT , RJ45
Twisted pair ( 100).
4- .
10base5 Ethernet. 2 , 15 AUI
Thick ethernet hosta. "" -
. - N-.(L<= 500)
10base2 Ethernet 50-
Thin ethernet BNC .
185 m (<=300m)
30
+-----+
|Host o------------------. ""
+-----+ \
\ ___
+-----+ \o | Hub
|Host o----------------------o | 10-base-T
+-----+ o___|
/
+-----+ /
|Host o------------------'
+-----+
+-----+ +-----+ +-----+ " "
|Host | |Host | |Host |
+--+--+ +--+--+ +--+--+ Thin
z-+---------------+---------------+-z
+-----+ +-----+ +-----+
|Host | |Host | |Host |
+----+ +----+ +----+ ethernet
n n n ^
n n n | 50
"" n n v
n==M===============M===============M=======n
Token ring IBM,
IEEE 802.5
- (8 ) shielded unshielded
, MultiStationAccessUnit (MSAU)
MSAU ,
.
- -.
,
"", .
, ,
. .
. -Monitor,
, ,
.
- .
.
Dual Attachment .
,
( ), .
( DAS )
___0 DAS ___0 DAS
/___o /___|
// \\ //
|| |* --> || *
|| o| || o*
\\___/o DAS \\___/| DAS
\___/ \___/
- Token ring.
. Monitor'
.
1 Tx+ | +-1---8-+ | Rx+ 3
2 Tx- | | | | Rx- 6
3 Rx+ | |_____| | Tx+ 1
4 | |
5 | |
6 Rx- |___________| Tx- 2
7 ( )
8
-----------------------------------------------------------------
, HUB' (point-to-point)
"" . Tx+<-->Rx+, Tx-<-->Rx-,...
ethernet-
,
"" - .
Last-modified: Fri, 10 Jul 1998 05:17:05 GMT