Straight-through and crossover twisted pair cable assemblies are used in DeltaV Control Networks. Both shielded, metal-enclosed and isolated or unshielded, plastic-enclosed RJ45 connectors are used on both types of assemblies.
You will need to build four types of cable assembly combinations:
- Crossover cable with one end shielded (metal-enclosed RJ45 connector) and one end isolated (plastic-enclosed RJ45 connector)
- Crossover cable with both ends shielded (metal-enclosed RJ45 connectors)
- Straight-through cable with one end shielded (metal-enclosed RJ45 connector) and one end isolated (plastic-enclosed RJ45 connector)
- Straight-through cable with both ends shielded (metal-enclosed RJ45 connectors)
Before building any of these assemblies, you will need to determine the correct combination of shielded and unshielded RJ45 connectors for your DeltaV Control Network. Refer to 10/100Mbit network examples to make this determination. These figures contain notes that indicate where metal-enclosed and plastic-enclosed RJ45 connectors are required and where straight-through and crossover cable are needed.
When building cable assemblies with shielded and unshielded connectors, always refer to the connector and tool manufacturer’s latest assembly instructions and application specifications. These specifications show the correct jacket and shield preparation length for the specific connectors being used.
Figure: Unshielded Connector shows an unshielded, plastic-enclosed RJ45 connector. First the boot is slid onto the cable, next the load bar is loaded with the eight inner cable conductors, then the load bar/cable assembly is inserted into the connector housing and crimped. Finally, the boot is slid over the assembly for additional strain relief.
Figure: Shielded Connector shows a shielded, metal-enclosed RJ45 connector. First the boot is slid onto the cable, then the cable shield and drain wire are folded back, next the load bar is loaded with the eight inner cable conductors, then the load bar/cable assembly is inserted into the connector housing and crimped. Finally, the boot is slid over the assembly for additional strain relief.
