Cisco ONS 15454 - Page 83

Default (dB)Max (dB)Min (dB)Sector
1.551.5Zone #4
1.550.4Auto Sector
Table 8: Reflection Sensitivity Value Range for Four Zones
Default (dB)Max (dB)Min (dB)Sector
-30-14-40Zone #1
-30-14-40Zone #2
-30-14-40Zone #3
-30-14-40Zone #4
-30-14-40Auto Sector
Table 9: Expert Mode Value Range
DefaultMaxMinParameter
0.450.4Loss Sensitivity (dB)
-30-14-40Reflection Sensitivity
(dB)
01500Capture Start Point (km)
11500Capture End Point (km)
0.011000.008Pulse Width
(microsecond)
303600Measure Time (s)
0.51000.4Resolution (m)
Step 5 Check the Enable ORL Continue Measurement on RX Direction check box to enable the Optical Return
Loss (ORL) measurement in the RX direction. ORL is available at port-level.
ORL represents the total reflected optical power from a complete fiber link. This includes the natural
backscattered power of the fiber and the reflected power coming from optical connectors, fiber splicing, or
other discontinuities along the link. ORL is expressed with a positive number and defined with the following
formula:
ORL [dB] = P_in [dB] – P_out [dB]
where P_in is the total incident power entering the fiber link and P_out is the total reflected power.
Higher ORL values are desirable for the fiber because they indicate lower back reflection. For example, an
ORL of 40 dB is better than 20 dB.
Turning Up a Node
83
Turning Up a Node
DLP-G782 Configuring OTDR Port Values