Call panel "Trombon VP" (hereinafter referred to as VP) is installed in the fire alarm zone and is designed to organise two-way voice communication with the selector block "Trombon BS-16", installed at the post-dispatch room. Power supply of the fire alarm system is carried out through the communication line from the selector unit.
On one zone of the selector block "Trombon BS-16" it is possible to connect one main call panel and one duplicate call panel.
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