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Maximum Link Distance Calculation
The following examples use the information provided in the previous pages to calculate the maximum allowable fiber optic link distance between two ports.
Example: Fiber Link With Mechanical Splice
In the following example, two ONline Concentrators are connected using fiber. If we use 62.5/125 fiber cable, the optical power budget according to Table
.
2000 meters
Mechanical
Splice
2.0 km Fiber Cable = 10 dB loss worst case using 5 dB/km loss fiber cable
1 Mechanical Splice = 1 dB loss worst case Path Loss = 11 dB
Figure 2-1. 2000 Meter Fiber Link With Mechanical Splice
The total path loss is 11 dB. Because the overall power budget is 14.5 dB, this leaves 3.5 dB to spare, so the link can be made.
Ensure you do not overdrive a receiver (that is, the received optical power level is not greater than the maximum receive sensitivity level of the fiber connector). In this case, the maximum possible transmit power,
Designing and Expanding the Network 2 - 11