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Contents
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Before you begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 
Chapter 1
Describing the optical routing system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
| Parts of the optical routing system | 18 | 
| Gigabit interface converter description | 18 | 
| Optical add drop multiplexer description | 19 | 
| Network add/drop ring application | 20 | 
| Optical multiplexer/demultiplexer description | 21 | 
| CWDM  | 22 | 
| CWDM  | 22 | 
| CWDM OMUX in a  | 23 | 
| CWDM OMUX in a ring application | 24 | 
Chapter 2
Calculating transmission distance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
| About transmission distance and optical link budget | 27 | 
| How to calculate expected loss budget | 28 | 
| How to calculate maximum transmission distance | 28 | 
| Assumptions | 28 | 
| Procedure | 29 | 
| 29 | |
| Mesh ring transmission distance | 30 | 
| Hub and spoke transmission distance | 33 |