Advanced Optical Systems proposes to modify an existing fiber-optic network to provide a means of supporting a group of existing inventory telephone instruments with a man-portable switched voice telephone network. The system is oriented on providing a rapid deployment capability to support highly mobile tactical forces in lieu of shelter-mounted switching node facilities. Additionally, the system will eliminate the requirement for specialized line termination equipment for each distinct type of terminal instrument connected to a tactical switching facility. The system will ... Existing inventory telephone instruments (both analog and digital), clean text and encrypted voice requirements, 2-wire and 4-wire telephone instruments, and a variety of signaling strategies (common battery signaling, ringdown, dual-tone ... Frequency