Microwave Absorbing Materials for Accelerators in Cryogenic Environments

Not Available Voice over Internet Protocol (VoIP) is a rapidly emerging commercial technology. This technology can be adapted to providing secure, digital compressed voice in unicast and multicast modes. The proposed SBIR research activity will lead to the development of a Networked Multipoint Secure Voice application that can be transparently overlaid on existing Navy ADNS networks to satisfy voice over wide area network requirements. Various voice compression algorithms will be explored for the best combination of voice quality and bandwidth utilization in the Navy's wireless environment. Requirements for a PC-based application will be defined to provide secure, multicast voice communications in a bandwidth efficient generic IP format. For the extreme narrowband circuit case (e.g. 2400 bps), methods will be explored to spoof the IP packet structure during call setup. Subsequent voice bits will then be streamed across the channel. The design will allow system interfacing to commercial routers, low-rate RF modems and multiplexers while still allowing the IP structure, as the LAN/WAN views it, to remain in standard format. Standard ATM switches with ethernet interfaces suffice for IP over AAL5 integration into the high speed ATM networks employed by the military. Security approaches for providing secure coding and secure call management will be identified. Encryption technologies to be considered include Fortezza variants, commercial encryption technologies, and legacy Navy encryption devices.