It's a 6-port DMX splitter with RDM support. This one uses RJ-45 connectors and a True1 in and thru for power! Great for installs!, From the
Obsidian RDM645 DMX Splitter
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The Netron RDM 645 is a rugged and compact DMX/RDM Splitter. Designed for live production and installations, it features six opto-isolated RJ45 DMX
Elation Professional Netron RDM 645 Rugged & Compact DMX/RDM Splitter
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RdmSplitter DIN rail DMX/RDM splitter/booster The RdmSplitter is an optically isolated splitter/booster for DMX and RDM networks. Extend the DMX network The widespread data protocol for lighting equipment is DMX-512. It is a very successful protocol with, however, a few limitations. The maximum number of attached devices is limited to 32 and a DMX cable should not be longer than 300 meters. The RdmSplitter helps tackle those inconvenient limitations.
Visual Productions DIN Rail Mounted DMX+RDM splitter/booster.
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Obsidian Netron RDM 645 DMX/RDM Splitter
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Obsidian Netron RDM 645 - 6-port RJ45 DMX/RDM Splitter