As service providers shift from legacy time division multiplex (TDM) private lines to Ethernet for business and backhaul services, the need to test private leased lines remains critical during the transition. JDSU assures the quality of legacy TDM services by providing the capability to continuously monitor and test DS3/1/0 circuits with turn-up, troubleshooting, fault isolation, and maintenance testing for wireless cell site facilities, IXCs, and LECs.