Black Box TS250A, Manual, Page: 35 / 64

Attenuation
Chapter 3 Optical TAPs
35
rev. 1
(Number of Connectors * Connector Loss) + (Fiber Length of Link A *
Fiber Loss) + (Fiber Length of Analyzer * Fiber Loss) = Attenuation
6
Subtract the output from step 5 from step 4 .
Power Loss Budget - Attenuation = Actual Loss
7
Repeat step 4 through step 6 for Link B to the analyzer.
For example, Figure 8 shows cable lengths to the TAP from the
network devices and from the TAP to the analyzer. Using these cable
lengths and some information from the device manufacturers, you can
determine the power loss.
Figure 8 Cable lengths to/from the TAP
The equations here are examples of how to calculate a power loss
budget with actual values.