In the late 90s into the early 2000s I worked at a large international ISP. During my first few years there our network containing ATM switches both terminating

In the late 90s into the early 2000s I worked at a large international ISP. During my first few years there our network containing ATM switches both terminating backbone circuits and as intra-PoP fabrics. For a period of time the ATM switches had to be rebooted every 45 days because otherwise they would perform an uncontrolled reboot.