, , :
□ , ( ) . , , (, ). .
.
□ , . , , . , , , -, , -, , , . . . , , , .
□ . , , , . , , (virtual channel).
.25, Frame Relay ATM.
, . , - , . , . , , , . , , .
-: (Logical Channel number, LCN) .25, (Data Link Connection Identifier, DLCI) Frame Relay, (Virual Channel Identifier, VCI) ATM.
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, , . , , .
, .
. 7 , - VC1 VC2.
. 7.
N1, N2 SI, S2 S4. N3 S5 S3 SIN1.B , , N1 N2 S1, S3 S4.