美国加州休斯飞机公司微电子系统分部研制了一种点——点通信用的“入侵检出光通信系统”(IDOCS),它不用加密就能作满足不同保密等级要求的保密数据通信。系统由两个调解器和一条组成保密数据链路的专用光缆构成。双峰复用和光功率监测给光缆链路提供了安全性,外来的侵入会引起IDOCS告警并停止传送用户数据。保密MODEM FAM131的采用,又给系统提供了附加的安全性。 Hughes Aircraft Corporation of America Microelectronics Division developed a point-point communication “Intrusion Detection Optical Communication System” (IDOCS), which can be used to meet the requirements of different security levels of confidential data communications without encryption. The system consists of two modems and a dedicated optical cable that forms a secure data link. Bimodal multiplexing and optical power monitoring provide cable link security, and external intrusion can cause IDOCS alarms and stop transmitting user data. The use of confidentiality MODEM FAM131, in turn, gives the system additional security.