When troubleshooting a typical T1 with telco and they say they have your CSU looped. Are they actually able to give the CSU inside the Cisco Router a command to be looped or are they really just looping the smart-jack/demark ? I've been on the phone with telco and seen that when they claim to have the CSU\DSU looped, what they are actually doing is looping the smart-jack/demark, which will loop all traffic from the csu back on itself.
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