The OTDR is one of the most powerful tools you will purchase to support your fiber network. This article discusses one key but sometimes confusing OTDR specification, Dynamic Range.
The informal definition of Dynamic Range is “how far can my OTDR see?” There are at least two formal definitions of Dynamic Range, the Telcordia definition (the most widely accepted and specified), and IEC definition. Each of these specify the amount of (one way) fiber loss from the initial backscatter (fiber) signature to a given Signal to Noise Ratio (SNR) level on the OTDR trace.
OTDR Dynamic Range Specification (SNR Limit)
IEC 98% Telcordia 50%
The IEC range wil ...