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  1. jagotm

    Cisco 1721 Router and X21 Frame Error Problem

    I have a two Cisco 1721, with WIC-2T cards, which are setup to communicate with each other over as ISDN B channel using HLDC. I can ping either end but the performance is terrrible. Typically I am losing between 40 - 60% of packets. When I do a show 'interface command' for the serial ports...

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