---
title: "What is the difference between simplex and duplex multiplexers?"  
description: "What is the difference between simplex and duplex multiplexers?"  
author: "Mukul Goenka"  
published: 2022-05-24  
canonical: https://answers.mindstick.com/qa/97593/what-is-the-difference-between-simplex-and-duplex-multiplexers  
category: "troubleshooting"  
tags: ["troubleshooting", "cctv camera"]  
reading_time: 1 minute  

---

# What is the difference between simplex and duplex multiplexers?

What is the difference between simplex and duplex multiplexers?

## Answers

### Answer by Hitesh Vohra

Video multiplexers are used to capture several cameras on a single recorder. A **simplex machine** is best for applications where simply recording is important. While in record mode, simplex machines are unable to display multi-screen images (i.e. quad, 9 way, and 16 way split).\
A **duplex machine** is preferable if an operator is watching the system (for example, a security guard). Screen splits and user selected images can be provided by a duplex machine without impacting what is recorded on the recorder. It is possible to record and replay simultaneously if you use two recorders. \
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**Read More: [What is the difference between DVR & NVR?](https://answers.mindstick.com/qa/97597/what-is-the-difference-between-dvr-nvr)**


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Original Source: https://answers.mindstick.com/qa/97593/what-is-the-difference-between-simplex-and-duplex-multiplexers

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