19 or 23" MX rackmountable chassis. The ADTRAN OPTI-6100 delivers all the versatility and functionality that today's service providers need for cost-effective network expansion. This compact, state-of-the-art unit seamlessly integrates with and modernizes existing networks. The OPTI-6100 consolidates discrete optical and multiplexer network elements into one small 2U (3.5-inch) high chassis. Two chassis options are available, the MX (17.5 inches wide) and the SMX (8.5 inches wide). The MX mounts in a standard 19- or 23-inch rack. The SMX is wall or rack mountable with the option to mount two units side by side in a 19- or 23-inch rack. The feature set, small footprint, low cost, and diverse deployment options of the OPTI-6100 make it a powerful tool for optical delivery of DS1, DS3/EC-1 (STS-1 electrical interface), OC-3, OC-12 and Ethernet. It supports all of the maintenance and administration tools necessary for service providers to administer their networks efficiently. Its fully integrated design provides the management and redundancy features expected of carrier-class broadband multiplexers. The OPTI-6100 is the industry’s first OC-3/OC-12/OC-48 multiplexer to deliver a combination of DS1, DS3/EC-1s, Ethernet, OC-3 and OC-12 drops. ADTRAN provides the ability to utilize all of the bandwidth in an optical network interface for customer services without stranded bandwidth. Its compact design is significantly smaller than similar products and it delivers superior functionality at a fraction of the price.