- Shielding provides EMI/RFI protection and data security - Panels feature a stainless-steel plate to provide grounding - continuity between connectors and panel - Standard-density panels include star washers and grounding lug - for flexibility in panel grounding - High-density panel includes hardware to accept standardscompliant - grounding connectors - 4S255-D48 offers 48 ports in only 1RU of rack space