- Adataterminalequipment(DTE)recognizesavirtualcircuitbyitsassociatedLCN.Asignalfromamodem(dataset)toaDTEindicatingthatitisreadytooperate.ThefitloopbackteststhecablebyloopingthesignalbackafteritreachestheDTEport.Auniquereferencenumberthatidentifiesalog...
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