Abstract: High availability today plays an important role in protecting continuous running of critical telecommunication equipments. When the hardware or the software goes wrong, high availability technologies can help the system to mainlain normal. In order to improve the robustness of telecommunication ectuipments in the presence of errors, this paper analysed the high availability requirements of telecommunication equipments. Based on carrier grade operating system CGEL (Carrier Urade Embedded Linux) , this paper proposed and implemented a series of high availability designs, ineluding of condition monitoring; error control; failover; on-line operations. The functions of these high availability designs are relative independent, but closely related each other. The experimental results show that these designs can help telecom equipments to effectively resist the hardware and software failures, and ensure non-stop telecom system for stable operation.

Key words: High availability, Carrier grade, Condition monitoring, Failover, Redundancy