The errors would follow the T1. You're taking the working T1 and putting it into the CPE that is causing the slips. Pure slips can only be caused by CPE equipment, that CPE can be a DACS, or whatever it terminates in. Once again take your TBerd, and time it off the good circuit while monitoring you will see the slips. The string command for checking for slips is fine, most carriers (Verizon) don't know how to test for slips, they don't care about slips, it's not their problem. If Verizon were causing slips than many thousands of T1's would be slipping. Make sense? The supplier of the clock can't slip.
