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ATM , , . - QoS, . NNI UNI .
UNI 3.1 Q.2931, ITU-T. VPI 0, VCI =5. NNI .
, . , . , . , QoS. QoS , . QoS.
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ATM
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ATM, , . , , .
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ATM , (, PCI). ( ), ATM . ( 3Com) ATM , .