As networks get faster, cabling to support them needs upgrading. Outside plant networks, most of which run on single-mode fiber optic cable with its almost infinite bandwidth, are rarely in need of upgrading. On the other hand, premises cabling usually needs to be upgraded.
The fire alarm systems industry has changed considerably over the years. Many old-timers can remember a fire alarm system that only detected a fire and sounded an alarm. Nonfire alarm systems did not interface with these fire alarm systems.