In its basic configuration, CopperPro 990DSL offers a broad range of Plain Old Telephone Services (POTS) troubleshooting, fault location and line qualification capabilities. Its Wideband/TDR option adds high-frequency transmission testing and qualification functions for services like ADSL, HDSL and HDSL2, ISDN, T1, E1 and DDS. And the TDR feature of the option adds precise fault location and analysis. The Wideband/TDR option can be added at time of purchase or later at an authorized service center.