![Top](https://www.experimental-engineering.co.uk/wp-content/uploads/2017/07/IMG_20170714_124948-300x169.jpg)
Here’s a tiny ethernet switch from the great fle market that is eBay – the Tenda S105. This unit has 5 ports, but only supports 10/100M. Still, for something so small it’s not bad.
![Bottom](https://www.experimental-engineering.co.uk/wp-content/uploads/2017/07/IMG_20170714_124957-300x169.jpg)
Not much on the bottom, there’s a pair of screw hooks for mounting this to a surface.
![Ports](https://www.experimental-engineering.co.uk/wp-content/uploads/2017/07/IMG_20170714_124938-300x169.jpg)
The 5 ports on the front actually have the pins for the unused pairs of the ethernet cables removed – saving every penny here.
![PCB Top](https://www.experimental-engineering.co.uk/wp-content/uploads/2017/07/IMG_20170714_124849-300x169.jpg)
The casing just unclips, revealing the small PCB. Nothing much on the top, just the connectors, isolating transformers & the crystal for the switch IC.
![PCB Bottom](https://www.experimental-engineering.co.uk/wp-content/uploads/2017/07/IMG_20170714_124911-300x169.jpg)
The bottom of the PCB is a little more busy, mainly with decoupling components. There’s a 3.3v linear regulator to step down the 5v input for the switch IC.
![Switch IC](https://www.experimental-engineering.co.uk/wp-content/uploads/2017/07/IMG_20170714_124915-300x169.jpg)
The IC doing all the data switching is an IP175G 5-Port 10/100 Switch from IC+ Corp. No datasheet available for this, but it’s going to be a bog-standard switch.