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Nortel Networks 10292FA User Manual

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Chapter 2 Calculating transmission distance
29
Installation and Networking Guidelines for Optical Routing
 
Procedure
To calculate the maximum transmission distance for a proposed network 
configuration:
1
Identify all points where signal strength will be lost.
2
Calculate the expected loss for each point.
3
Find total passive loss by adding the expected losses together. 
4
Find remaining signal strength by subtracting passive loss, and system margin 
from total system budget.
5
Find maximum transmission distance by dividing remaining signal strength 
by expected fiber attenuation/km.
Point-to-point transmission distance 
The following factors affect signal strength, and determine point-to-point link 
budget and maximum transmission distance for the network in 
•
CWDM OMUX mux loss
•
CWDM OMUX demux loss
•
Fiber attenuation 
The Ethernet switch host does not have to be near the CWDM OMUX, and the 
CWDM OMUX does not regenerate signal. Therefore, maximum transmission 
distance is from GBIC to GBIC. 
Figure 11   Point-to-point network configuration example
OMUX-8
OMUX-8
GBIC
GBIC
Transmission Distance
(GBIC to GBIC)