SDII/SONET, PDH, , PDH.
, SDM/SONET, - , , PDII, - : 1,5; 2; 6; 34; 45; 140 /, 1, 1, 2, , , 4 ( 2 SDH). , , - PDH, , , SDH/SONET - SDH/SONET. PDH 2 ITU-T ETSI. SDH.
, SDH - PDM SDII. . :
- SDH, ;
- .. .
. , STM-N , , , . .. - , . . ( ).
, . 4 : 1-4, PDII: E1-E4. . (), , ().
, SDII - .. , PDII.
VC : , , , , STM-1.
, , , .. -.
, / . VC , . VC , .. "" , .
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, SDH - VC , .
VC , VC (VC-3 VC-4) , , , . SDH (), . . . VC .. , , , ( ) VC . VC SDH , .
, SDH - .. .
SDH , STM-N 9×9×N . (3,33%), ( 81 ),
() . , 64 /, , STM-1 5,184 /, STM-N N.
.. . SDH .. , VC-4, PDH 140 /. , , STM-1 9×270=2430 , 8000 SDH: 2430×8×8000=155,520 /. - 4N-1. SDH 5 , .9-1. , , , SONET.
9-1. SDH SONET
STM-N (SDH) | STM-0 | STM-1 | STM-4 | STM-16 | STM-64 | STM-256 | |||
(SONET) | -1 | -3 | -12 | -24 | -48 | -96 | -192 | -384 | -768 |
, / | 51,8.1 | 155,52 | 622,08 | 1244,16 | 2488.32 | 4976,64 | 9953,28 | 19906,56 | 39813,12 |
-1 STM-0 SDH, G.707.