Black Box 39004, 39005 manual Operation Diagram

APPENDIX: Fiber Optic Planning Guidelines

STEP 2: OVERALL OPERATION CONSIDERATIONS

The operation diagram (Figure A-2) shows one example diagram and one blank diagram to be completed based on real values:

1.Draw horizontal lines at the min. and max. value of the fiber optic pulse width* of the affected units.

2.Calculate the maximum total distance based on the calculations above and draw a vertical line.

3.Choose the correct dispersion line** based on fiber optic transmitter type*.

4.Shade the allowed operation range as shown in Figure A-2.

*To be found in the technical data section of the units’ documentation.

**Industry-standard cable quality assumed: 18 ps/(nm*km) @ 1550 nm.

A.3 Operation Diagram

Example: Physical operation restrictions for a unit with 1550-nm standard laser, a fiber optic pulse width between 10 and 100 ns and a calculated maximum distance between the units of 60 km.

The operation you choose must be inside the allowed (shaded) area.

NOTE

The right border of the operation area is defined by the dispersion or distance line, whichever comes first (leftmost). Some units use only one discrete fiber optic pulse width. In this case, the allowed operation area collapses to a horizontal line. If there is no dispersion line for the used fiber optic transmitter type, dispersion can be ignored.

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