SDH , . , . , .
, . . 100 %, - . frame relay, .
SDH , frame , , ISDN. , SDH . SDH - SDH-.
, PDH SONET/SDH . . 6.11. - - .
. 6.11. -
SONET/SDH , , , . , , , .
SDH , - , Andrew Corporation.
1991 , , Andrew Corporation.
32-, 16- 8- - Pirelli, . 350 . , 1000 .
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SDH 1 (155 /) - TN-1X Northern Telecom (Nortel), 63 1 2 / . ( ) -, , . , .
. , . . , , , 4- SDH (622 /).
. 4 (622 /) TN-4X Nortel. NRM (Network Resource Manager). 1 4 . , , : , ; , , .
TN-4X , .
, . : , . , .