Fiber-Optic UCM Communication
BMTW-SVN01F-EN 67
Figure 32. Typical Fiber-Optic UCM Communication-Link Layout
Optical-Link Loss Budget
Every fiber-optic link has some signal loss (measured in decibels). Many
factors affect decibel loss, including:
• Length of fiber-optic cable
• Transmitter optical output power
• Operating wavelength
• Fiber attenuation
• Fiber bandwidth
• Receiver optical sensitivity
The decibel loss between any two devices is based on how well the termi-
nations or splices are made. A termination or splice can vary from
0.5–2 dB loss. A clean splice results in increased performance.
The fiber-optic modem supported by Trane has a power budget of 14 dB
between 32°F and 140°F (0°C and 60°C). This is the acceptable tempera-
ture range specified for the BCU. The decibel loss for conduit-rated fiber-
optic cable (P/N 400-4002) is 3.75 dB/km (1 km = 3,280 ft). Precut fiber-
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