1. A method for configuring ports on digital subscriber line (DSL) multiplexors, said method comprising: querying an element management system (EMS) to identify the DSL multiplexors; and for a first DSL multiplexor identified at the EMS: identifying a port of the first DSL multiplexor configurable to receive a customer line termination port card and a network line termination port card; obtaining from a predefined planning arrangement a parameter indicating that the customer line termination port card is to be installed in the identified port; configuring the port of the first DSL multiplexor based on the obtained parameter when the port has not been configured; and reconfiguring the port of the first DSL multiplexor based on the obtained parameter when the port is incorrectly configured for the network line termination port card.