# Loopback test for serial port and CAT cables

**URL:** <https://forum.digirig.net/t/loopback-test-for-serial-port-and-cat-cables/953>\
**Category:** Uncategorized\
**Tags:** troubleshoot-serial\
**Created:** [January 28, 2023, 1:21am UTC](https://forum.digirig.net/t/loopback-test-for-serial-port-and-cat-cables/953 "2023-01-28T01:21:42Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![K0TX](https://forum.digirig.net/user_avatar/forum.digirig.net/k0tx/32/3_2.png) [@K0TX](https://forum.digirig.net/u/K0TX)\
**Post date:** [January 28, 2023, 1:21am UTC](https://forum.digirig.net/t/loopback-test-for-serial-port-and-cat-cables/953/1 "2023-01-28T01:21:42Z")

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Here’s another garbage production quality video. This one is demonstrating the loopback test troubleshooting technique.

[![](https://forum.digirig.net/uploads/default/original/2X/0/08c64998133d64195f93647013d6890b4676b656.jpeg "Serial Port Troubleshooting - Loopback Test") ](https://www.youtube.com/watch?v=YO5xdaHg7UE)

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**Author:** ![Constrainted](https://forum.digirig.net/user_avatar/forum.digirig.net/constrainted/32/2219_2.png) [@Constrainted](https://forum.digirig.net/u/Constrainted)\
**Post date:** [January 28, 2023, 9:12am UTC](https://forum.digirig.net/t/loopback-test-for-serial-port-and-cat-cables/953/2 "2023-01-28T09:12:59Z")

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Thanks for the nice demonstration.