Back to the original question of this thread… Since there may be people who find this in the future just because of the thread title, I thought I would include a link to a post where we were discussing exactly that question a few days ago:
If you want context…
Programmers tend to think in terms of the total number of transactions completed.
However, consumer products, including residential security systems, are usually evaluated on the basis of “maintenance free operating period.” So let’s say you have a thermostat which completes about 150 internal transactions per day. If it was wrong once a day, a programmer might think that was 99.3% uptime. But from a consumer product standpoint, it’s zero reliability, because it fails every single day.
My own minimum requirement for an inexpensive intrusion alert security system is six months MFOP. That’s not great, but it would be good enough if I liked everything else about the system and the price was right. It would also not be good enough for a fire detection system, beca…
1 Like