The TIE VDS system lasted 26 years.

It has a couple phone die over the years.

The largest problem is after 25 years, the processor went bad.

I was charged a fortune for a used one.

Now that system is taken off line, no one even wants the system for parts.(I still have it if anyone is interested)

It does not make since if you can end up selling a processor for thousands of dollars for someone who really needs one.

Anyway, its remarkable how these phone systems are running 24/7/365 and hundreds of thousands of hours worth on phone calls build to be up 99.99999% rock solid reliability.

Expensive computer servers in companies running something stable like Linux(not microsoft) still probably has to be reset around every month. I have even had something as simple as an expensive calculator go bad in less time than the phone system.

So if you considering how the phone system companies to any other piece of technology you have. Its absolutely fantastic. I don't know how they got to reliable but I wish more electronic products were made this well.