, (Synchronous Transport Module - STM), = 125 .
STM-1, STM-4, STM-16, STM-64 STM-256, , , , , .
STM-N .2.
.2 -
( PDH 1, 4 (Container) , SDH, . .3 .
.3
-11 | -12 | -2 | -3 | -4 | |
, / | 1,544 | 34368 (44736) | |||
, | 252 (756) | ||||
.
( ) , . .
(. .2) :
1) .
2) .
3) ().
(Mapping)
1, 1, , 4 . :
1) (1, 1, , 4).
2) ( ). - .
3) .
4) .
VC (Virtual Container) (Path Over Head). VC () .
|
|
.
VC: VC-11, VC-12, VC-2, VC-3, VC-4.
(Aligning)
, VC-4, VC STM-1. VC ( ) VC ( ). VC ( VC VC) TUP (Tribe Unit Pointer), . , TU.
: TU-11, TU-12, TU-2, TU-3.
VC-4 () AU-4 PTR (Administration Unit Pointer), SOH STM-1 VC-4 STM-1.
SOH -Section Over Head - , :
RSOH - Regeneration Section Over Head MSON - Multiplex Section Over Head.
, . () () SOH. .
- STM-N, , , , , ..
, RSOH , , STM, , . MSOH , VC, , , .