Designed to mount to any standard 19in Rack or Cabinet; Space saving,high-density 1U(24 port) 2U(48 port),19-inch panel design; Termination:110/krone IDC vertical punchdown for 22-26 awg solid wires,durability 200 cycles IDC contact material phosphor bronze with tin plating over nickel; Housing materal: :PC.PBT UL94-0; Contact material::phosphor bronze with 50U?inch gold plating over nickel; Panel frame:Black electrostatic powder-coated steel; Certification::UL listed.TIA/EIA568A/B,ISO/IEC11801/YD/T926.3-2001.