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30 Chapter 2 Calculating transmission distance
212257-B
Table 3 shows typical loss values that can be used to calculate the transmission
distance for the point-to-point network in Figure 11.
Table 4 shows calculations used to determine maximum transmission distance for
the point-to-point network example in Figure 11.
Transmission distance calculation for the point-to-point network example in
Figure 11:
•
•
•
Mesh ring transmission distance
The transmission distance calculation for the mesh ring configuration in Figure 12
is similar to that of the point-to-point configuration with some additional loss
generated in the passthrough of intermediate CWDM OADM nodes.
Table 3 Point-to-point signal loss values
Signal loss element value (dB)
Loss budget 30 dB
CWDM OMUX-8 mux loss 3.5 dB
CWDM OMUX-8 demux loss 4.5 dB
System margin 3 dB
Fiber attenuation .25 dB per km
Table 4 Point-to-point maximum transmission distance calculations
Result Calculation
Passive loss
Implied fiber loss
Maximum transmission distance
mux loss demux loss+
loss budget passive loss system margin––
implied fiber loss attenuation per kilometer
÷
3.5 dB 4.5 dB 8.0 dB Passive Loss=+
30 dB 8 dB – 3 dB– 19 dB Implied Fiber Loss=
19 dB .25 dB 76 km Maximum Transmission Distance=÷