Viavi JDSU 4126 LM SM OTDR Module 1310/1550 nm Last Mile 34/32 dB E4126LMCondition: Used In working condition, supplied as pictured. Viavi 4126 LM SM OTDR Module Source: 1310 1550 nm Dynamic Range: 34 32 dB Connector: SC Event Dead Zone: 1 m Attenuation Dead Zone: 4 m From the manufacturer: Key Features 34 32 dB Dynamic Range at 1310 1550 nm High resolution and short dead zone for distribution fiber qualification Instantaneous traffic detection when connecting live fiber First to market OTDR integrating a true Loss Test