Nortel Networks 10292FA, 10396EA manual Mesh ring signal loss values

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32Chapter 2 Calculating transmission distance

Table 5 shows typical loss values that can be used to calculate the transmission distance for the mesh ring network example in Figure 12.

Table 5 Mesh ring signal loss values

Signal loss element	value

Loss budget	30 dB

CWDM OADM insertion add loss	1.9 dB

CWDM OADM insertion passthrough loss	2.0 dB

CWDM OADM insertion drop loss	2.3 dB

System margin	3 dB

Fiber attenuation	.25 dB per km

Table 6 shows the calculations used to determine maximum transmission distance for the mesh ring network example in Figure 12.

Table 6 Mesh ring maximum transmission distance calculations

Result	Calculation

Passthrough nodes	nodes – 2

Passive loss	OADM add + OADM drop + (passthrough nodes × OADM passthrough loss )

Implied fiber loss	loss budget – passive loss – system margin

Maximum transmission	implied fiber loss ÷ attenuation per kilometer
distance

Transmission distance calculation for the mesh ring network example in

Figure 12:

•	8 nodes – 2= 6 Passthrough nodes
•	1.9 dB + 2.3 dB + (6 nodes × 2.0 dB)= 16.2 dB Passive Loss
• 30 dB – 16.2 dB –3 dB = 10.8 dB Implied Fiber Loss
•	10.8 dB ÷ .25 dB= 43.2 km Maximum Transmission Distance

212257-B

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Contents Installation and Networking Guidelines for Optical Routing Copyright 2002 Nortel Networks 212257-BInstallation and Networking Guidelines for Optical Routing Canada requirements onlyNortel Networks Inc. software license agreement Installation and Networking Guidelines for Optical Routing 212257-B Contents Chapter Installing the shelf, OADM, and Omux ContentsFigures Figures 212257-B Tables Tables 212257-B Preface Component FunctionPreface Before you beginHard-copy technical manuals How to get help Technical Solutions Center TelephonePreface 212257-B Chapter Describing the optical routing system Wavelength division multiplexingParts of the optical routing system Gigabit interface converter descriptionDescribing the optical routing system Parts of the optical routing systemOptical add drop multiplexer description Cwdm Gbic transceiver and labelNetwork add/drop ring application Cwdm Oadm network and equipment side connectionsCwdm Oadm ring configuration example Optical multiplexer/demultiplexer descriptionCwdm OMUX-4 Cwdm Omux in a point-to-point application Cwdm OMUX-8 network and equipment side connectionsCwdm Omux point-to-point configuration example Cwdm Omux in a ring applicationCwdm Omux ring configuration example Describing the optical routing system 212257-B Chapter Calculating transmission distance About transmission distance and optical link budgetCalculating transmission distance How to calculate expected loss budgetHow to calculate maximum transmission distance Point-to-point network configuration example Point-to-point transmission distancePoint-to-point maximum transmission distance calculations Point-to-point signal loss valuesMesh ring transmission distance Mesh ring network configuration Mesh ring signal loss values Mesh ring maximum transmission distance calculationsHub and spoke network configuration Hub and spoke transmission distanceHub and spoke signal loss values Hub and spoke maximum transmission distance calculationsExceeding class 1 power level warning Chapter Installing the shelf, OADM, and OmuxPreparing for installation Electrostatic discharge Installing the shelf, OADM, and OmuxEnvironmental and physical requirements Installing the shelf Inserting a Cwdm Oadm or a Cwdm Omux Shelf with plug-in module in 19-inch rackCabling a Cwdm Oadm or a Cwdm Omux Cabling a Cwdm OadmCabling a Cwdm Oadm Cabling a four-channel Cwdm Omux Cabling a Cwdm OMUX-4Cabling an eight-channel Cwdm Omux Cabling an Cwdm OMUX-8 Removing a Cwdm Oadm or a Cwdm Omux Appendix a Cwdm Oadm specifications Cwdm Oadm specificationsAppendix a Cwdm Oadm specifications 212257-B Appendix B Cwdm Omux specificationsCwdm Omux specifications Appendix B Cwdm Omux specifications 212257-B Appendix C Handling and cleaning fiber optic equipment PrecautionsTools and Materials Cleaning Fiber Optic ConnectorsAppendix C Handling and cleaning fiber optic equipment Cleaning Single SC and FC Connectors Cleaning Duplex SC Connectors Cleaning Receptacle or Duplex Devices Page Glossary Glossary Dwdm See optical fiber Group of circuits connected at one point on a network See MMF Ndsf An optical wavelength band for WDM optical communications Device that does not require a source of energy to function See SMF WDM Glossary 212257-B Index Cwdm OmuxIndex OMUX, CwdmIndex Index 212257-B