---
title: What is a link loss budget and why is it important? | IQGeo
description: Learn what a link loss budget is and why it is crucial for fiber network operators.
---

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# [What is a link loss budget and why is it important? | IQGeo](https://www.iqgeo.com/blog/what-is-a-link-loss-budget-and-why-is-it-important)

 Written by [IQGeo](https://www.iqgeo.com/blog/author/iqgeo) | 20 April 2020

A link loss budget analysis is how operators measure the operating characteristics of their networks. They are used to confirm that network equipment can support the target fiber optic link before the network is actually built.

In a link loss budget analysis, operators are testing attenuation and bandwidth across routing, components, fiber cables, length, and active components. In any network, signal strength weakens as it moves further and further away from the transmitting source. Signal is also lost at connector and splice points, which is why it’s necessary to ensure that signals make it from end to end without degrading too much.

The following steps are used to calculate total link loss margin:

- Calculate **fiber loss** by multiplying cable length by standard loss values
- Calculate **connector loss** by multiplying total connectors by standard loss values
- Calculate **splice loss** by multiplying total splices by standard loss values
- Calculate **cable plant loss** by adding fiber, connector, and splice loss values
- Calculate **loss margin** by subtracting cable plant loss from the projected dynamic range
- Ensure **link loss margin** is greater than 3dB to account for equipment degradation

 

[View full post](https://www.iqgeo.com/blog/what-is-a-link-loss-budget-and-why-is-it-important)

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