I have replaced a DSLAM with the VX-1000MDi on an existing network. The modems are not synchronizing with the unit. They seem to be going through an endless training cycle. Did I receive a bad DSLAM?

Please verify that the phone system on the network is analog. Digital phone systems will not work with DSL. You may also want to verify if the RJ-21 connections are plugged into the correct ports on the rear of the DSLAM and re-punch the junction box if needed. You will also need to configure the ports to “admin On” status and create the appropriate VPI/VCI for the DSL circuit.