Twisted-pair copper patch panels are built to a certain Ethernet specification, such as Cat 5e, Cat 6, or Cat 6a, and though they are backwards compatible, use different gauges of copper wiring to facilitate the greater bandwidth and shielding of the higher categories. In each case, the patch panel. Today, various styles of copper patch panels can be found in the market, such as shielded or unshielded patch panel, flat or angled patch panel, etc. Their design, material, and compliance directly affect signal integrity, insertion loss, crosstalk, manageability, and fire safety.