Телекоммуникационные системы
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(full duplex);
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:
“ ” (Cut Through).
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( 150
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(Store and Forward). -
. -
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12000 .
Ethernet, :
(8 ),
Ethernet 1500 ;
( ), -
( 7), ( 16 - 30). -
Ethernet
– ;
,
(16 – 32 – 64). -
Ethernet – -
4 - 8 .
Ethernet:
, , – ,
, . -
. -
-
.
2., Ethernet, “ ”
6.25), ,
.
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6.25 -
3. -
, “ -
”.
6.5.4IP
. ,
, ( )
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( – .).
IP - . IP ( -
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.) IANA,
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“ ”,
. IP -
4 , , 190.248.15.97. ,
, , - -
, . -
,
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190.248.15.0 |
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190.248.0.0 |
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135.15.42.0 |
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135.15.42.24
190.248.15.97
6. 26 -
, , -
: , ,
( -
“ ”) . -
1 ( 6.27) .
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190.248.15.97 |
190.248.15.0 |
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135.15.42.24 |
135.15.42.0 |
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140.248.0.1 |
198.248.0.0 |
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6. 27- 1 |
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1, 135.15.42.24 “ ” 1 2.
1.
, 190.248.15.97.
, 1
,
190.248.0.0. 190.248.0.0
3 1.
-
( ), -
RIP OSPF.
:
164
“ ”, ,
;
;
, Ethernet Frame Relay, .
( 6.28).
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Frame
Relay
Ethernet
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6. 28 -
, Ethernet
, (IP) .
Ethernet , IP -
. -
Frame Relay -
.
-
(VC). -
,
, .
.
, -
. . -
, -
. -
165
.
.
(PVC), -
, (SVC),
.
-
.
, -
(10-12 ),
4 20 .
.
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, -
, .
, -
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,
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X.25, Frame Relay, ATM, MPLS, Tag – switching Ethernet .
.
Frame Relay. , ,
(PVC)
. PVC Data Link Connection Identifies - DLCI. DLCI
. ( 6.29) -
DLCI . -
FR
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DLCI |
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C/R |
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DLCI |
FECN |
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6. 29 - Frame Relay
166
, FECN BECN
, DE
, 1. ,
Frame Relay -
Q0S, .
. – -
,
( , , ),
( , , ) -
. -
. , , -
, , ,
(53 ).
, -
.
-
, -.
VCI, -
. -
VCI 20 , -
, , .,
.
(PVC), – (SVC).
20 -
PNNI – Private Network to Network Interface.
, . -
VCI
VPI. -
, ( -
6.30).
VCI 
(VPI)
6. 30 -
VPI (8 ) –
VCI (16 ) – . -
167
,
.
168
7
7. 1
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– -
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( , , ), -
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7.1.
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7.1 -
169
( ) – , . –
( ) ( , ) .
( ) -
( ) ( ). , -
( ) -
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. , -
. , .
. -
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-
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7.2
-
, -( . . 1.10). ( ) .
( -
7.2)
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7.2 -
,
0.3 – 3.4 )
RJ-45 ( ) -
( )
. ( 10
). ( ),
, .
, -
( ). ( C)
170
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R , -
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( ) .
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–
PBX (Private Branch Exchange). – -
( 7.3). ( )
( ).
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7.3- –
, -
, ( ) . -
, – .
–
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7.3
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. -
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.
7.3.1.
-
0.3 – 3.4 . ,