As stated above, only those PAD-5s on a given P2 line card are synchronized. If system size requires the use of more than one P2 line card, and all the audible/visual signals must be synchronized, the GBF can be used to accomplish this. One P2 line card is selected as the “Master” for the purpose of providing master sync NACs to other PAD-5s on other P2 line cards. The selection of the “Master” P2 is completely arbitrary and should be based on the most convenient system wiring. The NACs from any PAD-5 on the Master P2 line can be used to drive the BFI of PAD-5s on other P2 lines. It is also allowed to place notification appliances on these Master NACs if standard line loss calculations are performed. Figure 12 shows a typical system wide NAC synchronization example for a Desigo Fire Safety Modular/Cerberus PRO Modular system using the PAD-5’s GBF capability. Notice that it is not necessary to utilize the BFI on any of the PAD-5s on the Master P2 line.
A P2 line includes all stubs or loops from a single P2 line source such as the XDLC in a modular system, the periphery board in a compact system, or the peripheral board in a 50-point panel.
CAUTIONIt is not recommended to connect the BFI to an external system’s NAC with the GBF application. The GBF can improperly interpret silencing of the BFI NAC as inactivity causing it to switch to its backup output rather than go silent.