X-Laser's Etherstop system allows you to send control data and e-stop on a single ethernet cable to your laser rig. This is a splitter for that system.
From the Manufacturer:
The EtherStop System is designed to simplify the setup and use of laser equipment by combining compliance signaling and network control signaling into a single inexpensive and common network cable.
Most X-Laser professional laser equipment (Black Label and Red Label products) include EtherStop interfaces that support daisy-chaining EtherStop cabling from one projector to the next, allowing rapid and scalable show setups that perform reliably and comply with applicable regulatory requirements in most jurisdictions.
Additional accessories like EtherStop distribution equipment provide additional flexibility and scalability. These include the EtherStop splitter and EtherStop router.