Ethernet Wiring

Ethernet is used for various devices within a Crestron Lighting Control system, including connecting a lighting control processor to the lighting network, connecting Zūm Net devices to the lighting network, connecting TSW touch-screen interfaces to the lighting network, and connecting the lighting network itself to a building network (building LAN).

Cabling

All cable should be Category 5e or greater (including Category 6 and Category 6a).

The maximum length of any single ethernet run is 100 meters (328 feet). Runs longer than this will require a powered ethernet switch (such as a CEN-SW-POE-5) to be installed midway through the run to enable proper communication.

Terminations

Cresnet Ethernet devices require the use of RJ-45 connectors. 

While either T568A or T568B termination pin-out are acceptable as long as they are used consistently, it is recommended to use the T568B pin-out for all terminations. By keeping to one standard, it is easier to stay consistent and prevent errors where the two sides of a single cable are not terminated to the same standard.

See Figure 1 for the T568-B pin-out.

When making RJ-45 terminations, take care that the wires are in the correct order and pushed all the way to the end of the connector. A crimping tool with sharp blades that have not been dulled with use also helps in making good terminations. 

Testing

Figure 1: Sea