, SDH- - , , , , , :
* () , ;
* / ;
* - (DigitalCross-Connect - DXC);
* - ;
* , ;
* - , , . .
(Multiplexer - MUX) - SDH PDH. () (), .. .
SDH- (SMUX) , PDH, , PDH- . , , . , . : /.
(Terminalmultiplexer - ) SDH- , PDH- SDH-. SDH- (STM-64), 10 /, PDH- 1.5, 2, 6, 8, 34, 45, 140 / SDH- 155, 622 2500 / ( STM-1, STM-4, STM-16). PDH , SDH (STM-1), . 2500 /, - 622 /. PDH-. .
SDH- ( /), , 1+1 . ( ) ( ), ( ). , "" "", SDH : - "", - - "". "" "". , .
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SDH , , , PDH, , , PDH . , , .. , . SDH - SMUX, , . , , SDH : /.
( - - , ""), , , ( ) , SDH, , .
, , STM-N STM-N-1 , , , , , SDH. , SDH. , , .
, - , STM-N ( 1 + 1) .
SDH . ( - ) 15-40 1300 40-80 - 1500 , 100-150 . 1 .
/ . - - DXC. , , () , -, . SDH VC-n, ( ) .
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SDH, .
SDH
. .
"-"
, A B, " - ", SDH (.3). , /, 1+1, ( /).
. 3 "-", .
" "
, , . (.4), 1+1 (.5). " ".
. 4 " ", TDM.
. 5 " " " " 1+1.