Johnson Controls FIRE-MON-17, Technical Manual

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10 IFC Networking—Metasys Intelligent Fire Network
The FN works in conjunction with the Metasys N1 LAN to provide
a complete system of fire alarm, security alarm, and HVAC
(Heating, Ventilating, and Air Conditioning) control. The Fire
OWSs and Fire-Net NCMs are connected to both the FN and N1 LAN,
while the IFC panels and INAs are only connected to the FN. The FN is
the fire alarm system communication path; however, if path resources are
available on the N1 LAN, fire alarm system communication may use the
N1 LAN.
When the fire alarm system requires commissioning and/or maintenance,
communication uses the N1 LAN. In addition, the N1 LAN provides the
interface between the fire alarm, energy management, and smoke control
systems.
Only Metasys components connected to the FN communication circuit are
UL Listed for fire alarm service. Metasys components connected
exclusively to the N1 communication circuit are not part of the fire alarm
system and do not need to be UL Listed for fire alarm service.
For details on the N1 LAN, refer to the N1 ARCNET Local Area Network
Technical Bulletin (LIT-636017) in the Network Communications section
of the Metasys Network Technical Manual (FAN 636).
Theory of
Operation