# Block Diagram
The Network Hub is built around a five-port Ethernet switch. Alongside the switch is a boost power supply to provide power-over-Ethernet (PoE) to a Cerulean Omnitrack system, and optionally other user-supplied PoE systems.
* One switch port connects to a PC via a USB-C interface (or optionally, the PC can connect via one of the two RJ-45 Ethernet jacks)
* One switch port connects to a [Blue Robotics BlueROV](https://bluerobotics.com/product-category/rov/bluerov2/) via a Fathom-X interface module and a Binder 700 jack. The Binder 700 is the standard tether connector used in the BlueROV. This jack is never supplied with PoE.
* One switch port connects to a [Cerulean Omnitrack system](https://docs.ceruleansonar.com/c/omnitrack-user-guide/omnitrack-user-guide) via a Binder 700 jack or an RJ-45 jack. These jacka are always supplied with PoE.
* Two switch ports connect to RJ-45 Ethernet jacks. The RJ-45 jacks can optionally be supplied with PoE, independently selectable.
* One DC-In jack is provided for input power for the switch and PoE functions. If DC-In is provided, no PC needs to be connected to the USB port.
### Network Hub Functional Block Diagram
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