The Z4-Series SeismicFrame® Cabinet was tested by a Telecommunications Carrier Group and ISO 17025 certified Independent Testing Laboratory (ITL) to meet Telcordia Technologies GR-63-CORE, Issue 4, April 2012, Sections 4.4 per Zone 4 requirements. GR-63-CORE seismic testing includes a series of physical shaker table tests during which a loaded cabinet is placed through simulated earthquake conditions. Zone 4 testing includes the most severe test conditions. The SeismicFrame Cabinet displayed limited movement and survived the test without permanent structural or mechanical damage, ensuring the internal equipment is not damaged. Find out more at http://www.chatsworth.com/z4-series.