SDH. .3-18 [115]. 12 , , .
, . : W, X, Y, Z - .3-18. 1 2 . , - . - .
.3-18. SDH |
. , (PRC). -. PRC, , PRC, - W X W X. Y Z - C&D, X. . , - C&D. - LPR.
14. SDH:
- 6 ;
- SDH, ;
- () 64 /, PDH - 2 /;
- G.703 ;
- : - , , 1997., - 1998.;
- 1998. , 2 /, 2-3 ABCDEF ( , [58]);
- 100% , .. 1+1 ( SDH ), , ABCDEF.
.
:
,
,
,
.
, : , - .
|
|
, , STM-4 252 (4x63=252) 2 /, , , 212 2 / (. .2-3 - 1998.). , , .
- . : F 63 - 27 31 (. .2-3), 4 STM-4 ( F ) ( : , a F D ). "-" (.2-28), , "", (.2-34) ADM, , . 4 STM-4 - STM-1, - STM-1 . ( -) , , ( ) ( ) .
.2-45. SDH |
, .2-45. . STM-N, . , , , D - STM-4, F - STM-1 ( , F, D F 63 ). , . , , A-BhA-C->D-B. " " (1:1) , 1:1 SDH. , , , , - , , .
, .2-3. 2-4, , ( , , ""). 1997/1998. .
2-4.
|
|
:
- - , - - D -> ;
- -¥ , - -> D - ;
- -> D, - - - D;
- -> D, - - - D;
- -> , - D - F - ;
- D -> F, D - - - F;
- -> F, - - D - F.
, .