There is no such standard. Fire alarm control panels are typically customized for as many loops as necessary for the structure. It may have one loop or a hundred or anything in between.
How many detector or sensor can be connected with fire alarm system is depend on what is the maximum number of the fire alarm system supported.
48
7
63
one
8 devices:)
The number of devices you can link to a router will depend on the specific router,typically 4 devices can be connected.
one
7
three
You can have up to seven Bluetooth controller devices on a PS3
distributed backbone
3