The ADTRAN MX3 Chassis is the foundation for a family of 3/1 cross-connect products. Supporting up to four DS3s, 28 DSX-1 drops, and two optional modules capable of processing up to six additional DS1s, the MX3 platform is well suited to a variety of applications. The MX3 Chassis houses two hot-swappable controller modules that provide 1: 1 redundancy for the T/R and DS3 signals. The optional modules support a variety of non-redundant services.The MX3 Chassis rear panel is equipped with an Ethernet port, an alarm output terminal block, auxiliary input terminals, four sets of DS3 in/out jacks, two amphenol connectors, and DC power connections.