, . : .
:
, , , . DAS , . , , .
FDDI . . , . , . FDDI , .
13 FDDI. .
14 FDDI. .
FDDI - : . (Dual Attachment DA)).
(Single Attachment (SA)). . (Single Attachment Station (SAS)) Dual Attachment Station (DAS)). SAC DAC . , .
, . : .
:
, , , . DAS , . , , .
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FDDI . . , . , . FDDI , .
15 ISDN ( , , ).
ISDN , . , . :
1. .
2. .
3. , , .
ISDN 1 6 ISDN (2). , ISDN , frame relay.
, , . , . ISDN , , .