Cisco ONS 15454 DWDM - Page 219

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Cisco ONS 15454 DWDM Reference Manual, R8.5
78-18343-02
Chapter 5 Multiplexer and Demultiplexer Cards
5.5 4MD-xx.x Card
• 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 shows the 4MD-xx.x faceplate.
Figure 5-17 4MD-xx.x Faceplate
For information on safety labels for the card, see the “5.2.2 Class 1M Laser Product Cards” section on
page 5-10.
Figure 5-18 shows a block diagram of the 4MD-xx.x card.
4MD
-X.XX
FAIL
ACT
SF
RX
15xx.xx
TX
RX
15xx.xx
TX
RX
15xx.xx
TX
RX
15xx.xx
TX
RX
COM
TX
96470