DCC Concepts DCD-SNX Cobalt Alpha DCC Power Bus Driver & Sniffer Adaptor. Cobalt Alpha DCC Power Bus Driver and SNIFFER Adapter The Alpha Sniffer is a simple and economical way to add a separate DCC accessory power bus to a layout. It works equally well for DC or DCC users who wish to employ Alpha, Alpha Mimic or Cobalt Digital products. DCD-SNX is also the perfect äóìsnifferäó� interface for easy connection of DCCconcepts äóìAlphaäó� products to DCC controllers that have sniffer ports. Of course, Alpha Sniffer will also work with ANY other brand of accessory decoder that allows simple äóìset-runäó� addressing of its outputs. How does the Cobalt ‘± Alpha system work? Cobalt Alpha Range Booklet