Design & Manf. of Telephone-related test sets, Cat 5,DSL, TDR, Cable Fault Locaters, Coin Line Qualifier, Test-All-IV, Test-All-25, 2110i TIMS, Time Domain Reflectometry, Fiber Test Sets. The Coin Line Qualifier reports line voltage & Current readings by digitized voice output on regular phone lines too, or assists in documenting and provisioning of coin lines.