Siemens DFM — DNET Fiber Module, the multimode fiber-optic interface for the digital audio network of the Desigo Fire Safety Modular system, part number 500-634910.
DNET carries eight digital audio channels between Desigo Modular enclosures, one DAC-NET card per enclosure. Copper DNET is limited by distance and electrical noise, so where enclosures sit in separate buildings or across a noisy plant the DFM converts that segment to glass and removes the ground reference between the two ends.
- 62.5 / 125 µm multimode fiber; this is a multimode interface only
- Wavelength 850 nm, power budget 12 dB, standard ST connectors
- Distance up to 6,562 ft (2 km) maximum
- Supports Class B (Style 4) or Class A (Style 7) DNET wiring
- 135 mA at 24 V per module from the screw terminal, standby and alarm
- UL and ULC-S527 listed, indoor dry, 32°F to 120°F (0°C to 49°C)
The DFM is the module alone. Its bracket is the separate DFM-BRK, 500-633779, which takes one module space in the rear of a CAB-1, CAB-2 or CAB-3 enclosure.
