Philadelphia International Airport
Terminals B-F
(I haven’t been in Terminal A, which has the same panel but different devices)
Panel: Simplex 4100U (Comventional with addressable devices being slowly added)
The old system was probably also addressable. Simplex makes a loop card for old Autocall devices, which is used when replacing a TFX-500 or TFX-800 panel with a 4100U or 4100ES.
More details: https://firealarm.com/?attachment_id=9787