Watchdog (AMC-IP)
From Zenitel Wiki
Contents
HW watchdog support
Software process watchdog
(watchdog service checking that all main processes are running)
Software application watchdog
(check if link to AlphaCom is up etc)
Recovery from a failure situation
(Recovery from a failure situation if the watchdog detects a failure e.g.:)
- Restart the process
- Restart with OS
- Power down/up.
System architecture
The watchdog on the AMC-IP board is comprised of two main elements; the watchdog circuit and the system monitoring software running on the CPU. The watchdog circuit requires an alive signal to be toggeled by the CPU regularly. This signal is toggeled by the system monitor at 100 Hz as long as all required processes is up and running. If the system monitor detects irregularities or hanging processes, it will attempt to restart these processes. If this dosen't work, it will stop toggeling the alive signal, and the entire AMC-IP board is reset.