Presolicitation notice from the Department of Defense, Department of the Navy, for the procurement of a BLANKER,INTERFERENC. This item is typically used for IT and telecom - network: analog voice products (hardware and perpetual license software). The notice states that the part requires engineering source approval and must be acquired from the approved source(s) due to their unique design capability, engineering skills, and manufacturing/repair knowledge. An alternate source must qualify according to the design control activity's procedures. Government source approval is required prior to contract award as the item is flight critical and/or the technical data available is not adequate for full and open competition. Interested parties must submit the required information for source approval. The proposed contract action is for supplies or services for which the Government intends to solicit and negotiate with only one source. All responsible sources may identify their interest and capability to respond to the requirement.