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I have a 3640 router with 4 port serial interface and 2 port fastethernet card. I'm trying to add NM-1HSSI card to the router with external CSU Adtran t3su 300. When I have all 3 cards in the router I cannot run ping command with datagram size 1500...

admin_2 by Participant
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A have setup c1721 with 2xWIC-2A/S as Access Router with one line enabled for incoming calls and outgoing calls to ISP. Access works fine, but dial-out does not.Here is a part of router setings and some debuging infos folows!interface Serial3 physica...