Power Monitoring - Cisco ONS 15454 DWDM Reference Manual

3.4.1 Power Monitoring

Figure 3-10
Figure 3-10
LINE RX
Control
Interface
3.4.1 Power Monitoring
Physical photodiodes P1, P2, P3, and P5 monitor the power for the OSC-CSM card. Their function is as
follows:
•
•
•
The returned power level values are calibrated to the ports as shown in
Cisco ONS 15454 DWDM Reference Manual, R8.5
3-12
shows the OSC-CSM optical module functional block diagram.
OSC-CSM Optical Module Functional Block Diagram
DROP
section
PV1
V
Control
PV2
V
LINE TX
Filter
ADD
section
V Virtual photodiode
P Physical photodiode
Variable optical attenuator
Optical splitter
P1 and P2: The returned power value is calibrated to the LINE RX port, including the insertion loss
of the previous filter (the reading of this power dynamic range has been brought backward towards
the LINE RX output).
P3: The returned value is calibrated to the COM RX port.
P5: The returned value is calibrated to the LINE TX port, including the insertion loss of the
subsequent filter.
P
P1
S1
Filter
HW Switch
P5
Control
P
Opt. Switch
P P
P4 P3
MON TX
Chapter 3 Optical Service Channel Cards
MON RX
COM TX
OSC RX
P P2
OSC TX
COM RX
S2
Table 3-5.
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