Black Box TS250A, Руководство пользователя, Страница: 36 / 64

Attenuation
Chapter 3 Optical TAPs 36
rev. 1
This shows the power loss budget for Link A to Link B.
The budget for the network side is 8.356 dB. Any split ratio is valid
because 8.356 dB is greater than any of the insertion losses from
Table 5 on page 33 .
Before we can say that any split ratio will work though, we must also
check the light power to the analyzer.
Link A
↔
Link B
Send Device Power -9.000
Receive Device Sensitivity - -19.5
Power Loss Budget 10.500
Number of Connectors 4.0
Connector Loss
1
1. Multimode.
x
0.5
Connector Loss 2.0
Fiber Length Link A (8 meters) 0.008
Fiber Loss Link A
2
2. 850nm multimode.
x
3.0
Fiber Loss Link A total + 0.024
Fiber Length Link B (40 meters) 0.04
Fiber Loss Link B
x
3.0
Fiber Loss Link B total + 0.120
Attenuation - 2.144
Power Loss Budget - Attenuation
3
3. Light power available for network. Any network split ratio smaller than
this number is feasible so long as the analyzer side is also feasible.
8.356