Cisco ONS 15454 DWDM Reference Manual page 219

Chapter 5 Multiplexer and Demultiplexer Cards
Software-monitored photodiodes at the input and output multiplexer and demultiplexer ports for
•
power control and safety purposes.
• Software-monitored virtual photodiodes at the common DWDM output and input ports. A virtual
photodiode is a firmware calculation of the optical power at that port. This calculation is based on
the single channel photodiode reading and insertion losses of the appropriated paths.
Figure 5-17
Figure 5-17
4MD
-X.XX
FAIL
ACT
SF
For information on safety labels for the card, see the
page 5-10.
Figure 5-18
78-18343-02
shows the 4MD-xx.x faceplate.
4MD-xx.x Faceplate
shows a block diagram of the 4MD-xx.x card.
"5.2.2 Class 1M Laser Product Cards" section on
Cisco ONS 15454 DWDM Reference Manual, R8.5
5.5 4MD-xx.x Card
5-21