(SDH)
(SDH) , .
C 2- :
1) : SONET ( )
2) : SDH
:
(STM )
4.
STM-1: 155 /
STM-4: 622 /
STM-16: 2,5 /
STM-256: 40 /
:
1) ( ) PDH: 1,5; 2; 6; 8; 34; 45; 140.
2) . , PDH. .. , ( ) .
3) . ( ) .
4) (5,184 / , ..)
SDH ( ). .
, SDH :
-n n (n = 1,2,3,4);
VC-n n (n = 1,2,3,4);
TU-n n (n = 1,2,3);
TUG-n n (n = 2,3);
AU-n n (n = 3,4);
AUG ;
STM-1 - .
-n ( ) .
C - , .
N - , .. 7.
-n -n n ( " ") ( ) SDH -, - PDH.
-n n SDH, -n, .. PDH:
-1 -11, 1= 1.5 /, -12, 1=2 /;
-2 -21, 2= 6 / -22, 2=8 /;
-3 -31, 3= 34 / -32, 3=45 /;
-4 4= 140 /.
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SDH ( ). .
1993 .
: 1), : STM-1 1 7 , ( , ). 2) 2/2 .
:
-n n;
VC-n n
TU-n n;
TUG-n n
AU-n n
AUG ;
STM-1 -
:
1) 2
2) 1 (3 3/3)
3) - (2 STM-1 1)
ETSI SONET/SDH. .
5. SDH ( ETSI SONET/SDH). .
: 1), : STM-1 1 7 , ( , ). 2) 2/2 .
:
-n n;
VC-n n
TU-n n;
TUG-n n
AU-n n
AUG ;
STM-1 -
:
1) 2
2) 1 (3 3/3)
3) STM-1 .
SONET/SDH 1993 . SDH .
