Nortel Networks 10396EA, 10292FA manual Mesh ring network configuration

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Chapter 2 Calculating transmission distance 31

As it passes from point A to point B (the most remote points in the mesh ring network example in Figure 12), the signal is expected to lose strength in the fiber optic cable, and in each connection between the individual CWDM OADMs and CWDM GBICs.

The following factors determine mesh ring link budget and transmission distance for the network in Figure 12:

•CWDM OADM insertion add loss

•CWDM OADM insertion drop loss

•Passthrough insertion loss at intermediate nodes

•Fiber attenuation of 0.25 dB per kilometer

The Ethernet switch host does not have to be near the CWDM OADM, and the CWDM OADM does not regenerate signal. Therefore, maximum transmission distance is from GBIC to GBIC.

The number of OADMs supported is based on loss budget calculations.

Figure 12 Mesh ring network configuration

Transmission Distance

(GBIC to GBIC)

A

GBIC

OADM

OADM

OADM

OADM

OADM

OADM

OADM

B

OADM GBIC

Installation and Networking Guidelines for Optical Routing

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Contents Installation and Networking Guidelines for Optical Routing 212257-B Copyright 2002 Nortel NetworksCanada requirements only Installation and Networking Guidelines for Optical RoutingNortel Networks Inc. software license agreement Installation and Networking Guidelines for Optical Routing 212257-B Contents Contents Chapter Installing the shelf, OADM, and OmuxFigures Figures 212257-B Tables Tables 212257-B Component Function PrefaceHard-copy technical manuals Before you beginPreface Technical Solutions Center Telephone How to get helpPreface 212257-B Wavelength division multiplexing Chapter Describing the optical routing systemParts of the optical routing system Parts of the optical routing systemGigabit interface converter description Describing the optical routing systemCwdm Gbic transceiver and label Optical add drop multiplexer descriptionCwdm Oadm network and equipment side connections Network add/drop ring applicationOptical multiplexer/demultiplexer description Cwdm Oadm ring configuration exampleCwdm OMUX-4 Cwdm OMUX-8 network and equipment side connections Cwdm Omux in a point-to-point applicationCwdm Omux in a ring application Cwdm Omux point-to-point configuration exampleCwdm Omux ring configuration example Describing the optical routing system 212257-B About transmission distance and optical link budget Chapter Calculating transmission distanceHow to calculate maximum transmission distance How to calculate expected loss budgetCalculating transmission distance Point-to-point transmission distance Point-to-point network configuration exampleMesh ring transmission distance Point-to-point signal loss valuesPoint-to-point maximum transmission distance calculations Mesh ring network configuration Mesh ring maximum transmission distance calculations Mesh ring signal loss valuesHub and spoke transmission distance Hub and spoke network configurationHub and spoke maximum transmission distance calculations Hub and spoke signal loss valuesPreparing for installation Chapter Installing the shelf, OADM, and OmuxExceeding class 1 power level warning Environmental and physical requirements Installing the shelf, OADM, and OmuxElectrostatic discharge Installing the shelf Shelf with plug-in module in 19-inch rack Inserting a Cwdm Oadm or a Cwdm OmuxCabling a Cwdm Oadm Cabling a Cwdm Oadm or a Cwdm OmuxCabling a Cwdm Oadm Cabling a Cwdm OMUX-4 Cabling a four-channel Cwdm OmuxCabling an eight-channel Cwdm Omux Cabling an Cwdm OMUX-8 Removing a Cwdm Oadm or a Cwdm Omux Cwdm Oadm specifications Appendix a Cwdm Oadm specificationsAppendix a Cwdm Oadm specifications 212257-B Cwdm Omux specifications Cwdm Omux specificationsAppendix B Appendix B Cwdm Omux specifications 212257-B Precautions Appendix C Handling and cleaning fiber optic equipmentAppendix C Handling and cleaning fiber optic equipment Cleaning Fiber Optic ConnectorsTools and Materials 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 Cwdm Omux IndexOMUX, Cwdm IndexIndex Index 212257-B