Cerberus Pyrotronics released the MXL in 1992.
While it has its quirks, in my opinion it was the best large-scale fire alarm panel of its time. (This statement is my subjective opinion. I’m not affiliated with Siemens or any of its predecessor companies.)
Over the years, various revisions were made, including…
- Support for FirePrint detectors, which use an algorithm that combines smoke and heat detection to prevent false alarms while quickly detecting real fires. (1998) I’ve seen FirePrint’s effectiveness first-hand in high school, when someone in the home economics room burned food to the point that the smoke entered and completely obscured the hallway. There’s a FirePrint detector right outside of the home economics room - and it never alarmed.
- A revised voice evacuation message module that added support for code-3 as a tone, and allowed field-recordable-and-configurable messages. (1998)
- A revised operator interface with a large display. (sometime in the 2000’s)
While the MXL was available for new installations until 2013, it was superseded by the FireFinder XLS in 2003. (technically, the XLS was released in 2002 but voice evacuation wasn’t available until 2003)
I contacted Siemens and they said they don’t know the exact release date, but they sent me a document that shows that the MXL was initially unveiled at an event in Puerto Rico in June 1990.
MXL lives on in many buildings. Migration kits are also available which allow a Cerberus Pro Modular (the new name for FireFinder XLS) to be retrofitted into an MXL cabinet without affecting the walls or replacing any initiating devices.