:
) PRC ( );
) - SRC ( / );
) 5x10-10 1x10-8 1x10-9 2x10-8 [160].
) ( ) - 110-8 110-6 [160].
ITU-T ETSI . SSM STM-N 5-8 (, S1), 1 2 /. , , , .
44) SDH-
, SDH- - , , , , , : () , ;; / ; - (Digital Cross-Connect - DXC); - ; , ; - , , . . [2].
(Terminal multiplexer - ) SDH- , PDH- SDH-.
- . , . . , .
- , ( , STM-n) ( 1+1) . , SDH-. - 15-40 ( 1300 ) 40-80 (1500 ), 250-300 .
|
|
- , , , . SDH- VC-n, .
/ ADM , (.2-19). / . , , ADM (, VC-4 , , .. /), ("" "") . , ( ) . ADM .
45) NM
- , - SDH SDH . , . 5.3.2, OSI, :
) ( );
) ;
) NE.
, NE, , ITU-T ISO, G.784, .3010, .217, .227, .219,
.229, ISO 9595, ISO 9596 . , ,
NM :
- ;
- ;
- ;
- ;
- ;
- .
, OS UNIX, , SUN SPARC (OS Solaris) Hewlett Packard (OS OpenView). , , - NM, NM Open View Hewlett Packard NM.