Laboratory environment for verification of protected multi-gigabit transmission systems

In order to prevent various types of attacks to ICT systems, techniques of path diversity and data encryption are used. In multi-Gbps channels propagation, delay and transmission errors are always present. These introduce difficulties in protected systems operation, especially in compensation of delay variation and system synchronization. The authors have developed laboratory environment for analyzing system stability in the presence of variable propagation delay and bit error rate. Bit error occurrence is emulated by customized error generator, while delay variation is emulated by variable delay lines. This environment consists of: hardware channel simulator based on FPGA platform, PC control software, and QoS measurement instrument. Test environment emulates fiber optic or digital radio-relay channel. Experimental results of testing emulated SDH STM-16 and Ethernet 1000BaseFx transmission channels are presented.