Handheld Optical Time Domain Reflectometer with 1310/1550 nm wavelength and 38/36 dB dynamic range (single-mode). Platform used to carry out optical, Ethernet, multiservice, and RF interference testing. Equipped with FTB-720C-SM1 OTDR module (1310/1550 nm, 36/35 dB)There are a variety of optical test sets that can be used to ensure quality of service (QoS) on fiber optic networks, but only the Optical Time Domain Reflectometer (OTDR) supports singled ended fiber testing to characterize fibers when measuring total loss, optical return loss (ORL), latency and. An Optical Time Domain Reflectometer (OTDR) is a precision tool used to detect faults and measure loss along fiber optic links by analyzing backscattered light from high-speed pulses. Essential for both installation and maintenance, OTDRs ensure network reliability with accurate fault location. An optical time-domain reflectometer (OTDR) is an optoelectronic instrument used to characterize an optical fiber. OTDR testing analyzes fiber optic cable performance from end to end by testing components along the cable, including connection points, bends, and splices. What Is an OTDR? What Is an OTDR? An OTDR is. metry (OTDR), covering its principle, impl e an essential tool for: characterisation, certification, maintenance and monitoring optical networks. They characterise the len th, attenuation and return loss (ov se individual events along ink: connection points (splices, connectors), te ng by. This white paper provides key information about OTDRs and guidance to newcomers in the telecommunication fiber optic market for selecting an OTDR appropriate to their testing needs.