[USR-TC] Changing configuration setting in Hiper Access Router Card

Hello, I'm trying to setup a Hiper Access Router Card using Hyperterminal. I've got (I believe) pretty much everything setup but I'm needing to change one thing. If you were to run a sho ppp setings at the command prompt, towards the end of the info that is listed I'm needing to change this setting: PPP Process RADIUS Challenge during PAP: I'm needing to change it from DISABLED to ENABLED. I've done this once before but I've forgotten the command(s) that I need to type in. Could someone point me to where I could find documentation or just tell me what I need to type?? Thanks-You, jim