Redundant design with multiple signal paths built in for high-availability.  12 expansion slots in the 2U version and 5 expansion slots in the 1U variant. Industry-first GPS integrity checking  Unique optical crosslink architecture for either Master-Slave hierarchical setups or Master-Master crosschecking and failover  2U version is operated by an intuitive touch-screen interface, a first for any master clock system.  All components are hot-swappable and are dual redundant.  The Output Signal modules are hot-swappable from the front and minimize the need to disconnect cables.