Avaya 8800 Planning And Engineering, Network Design page 52

Optical routing design
Figure 11: Hub and spoke network configuration
As the signal passes from point A to point B (the most remote points), it loses intensity in the fiber
optic cable, and in each connection between the individual OADMs, the OMUX-8, and the
transceivers. The number of OADMs that can be supported is based on the loss budget
calculations.
The following table shows typical loss values used to calculate the transmission distance for the hub
and spoke network.
Table 16: Hub and spoke signal loss values
Parameter
Loss budget
OADM insertion loss for Add port
OADM insertion loss for Through port
OMUX-8 demux loss
System margin
Fiber attenuation
The equations and calculations used to determine maximum transmission distance for the network
example are:
June 2016
Value
30 dB
1.9 dB
2.0 dB
4.5 dB
3.0 dB
0.25 dB/km
Planning and Engineering — Network Design
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