What is the difference between a shielded and unshielded modular coupler?

A Shielded Coupler is encased in a metal structure allowing it to ground to a metal wall plate or panel; an Unshielded Coupler is not.rj45 unshielded connector

A shielded coupler would be required when using a shielded cable terminated with a shielded plug. The shielded plug would tie the shield to the coupler, thus grounding it as well as passing it on to the shielded cable assembly plugged into the other side of the coupler. Because of this, a shielded coupler is only required if you are using shielded cable assemblies.

If the cable assemblies you are using do not have shielded plugs then you do not need a shielded coupler.These products are primarily used in the networking, telecommunications, computing, military, aerospace, transportation and broadcasting industries. Bel's product groups include Magnetic Solutions (integrated connector modules, power transformers, power inductors and discrete components), Power Solutions and Protection (front-end, board-mount and industrial power products, module products and circuit protection), and Connectivity Solutions (expanded beam fiber optic, copper-based, RF and RJ connectors and cable assemblies). The Company operates facilities around the world.