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This time I'm going to share a skill: How to use the FD to test fiber and can not interrupt the service.
After network-wide monitoring commands are delivered on the U2000 in one-click manner, the Optical Doctor (OD) system can monitor and report network optical-layer performance in real time. The OD system can monitor the following performance: main optical path performance, flatness, and input optical power of the receive-end OTU board. This topic describes the online performance monitoring principles.
Monitoring Main Optical Path Performance
The
OD system monitors the main optical path performance in each optical
multiplexing section (OMS). It determines whether the line loss exceeds the
design end of life (EOL) value, whether the optical power of the transmit-end
OA board or the line loss compensation is out of the permitted range, and
whether a fiber cut occurs on the main optical path.
The
following describes the process of monitoring main optical path performance
online:
1. Using the OD system, a user sends a task of monitoring main optical path performance.
2. The performance monitoring points on the functional boards over the main optical path start monitoring the specific performance.
· Line loss monitoring
The receive-end OA board detects the line loss and reports an alarm when the line loss exceeds the design EOL value.
· Monitoring of the optical power of the transmit-end OA board
The OD system compares the current input optical power of the transmit-end OA board in an OMS with the nominal optical power, and reports an alarm if the difference between the current input optical power and nominal optical power exceeds the threshold.
· Line loss compensation monitoring
The receive-end OA board detects the line loss and reports an alarm when the difference between the line loss and the gain value of the OA board exceeds the threshold.
· Fiber cut on the main optical path
The OD system checks for the MUT_LOS alarm to determine whether a fiber cut occurs.
3. The monitoring information is reported to the OD system on the U2000.
4. The OD system processes the monitored performance data and displays it on GUIs.
Monitoring Optical Performance Flatness
Optical
performance flatness monitoring is performed based on OMS sections.
The following describes the process of monitoring optical performance flatness:
1. Using the OD system, a user sends a task of monitoring optical performance flatness.
2. The functional boards on the main optical path start monitoring the specific performance.
The MCA board is used to scan the optical power of all single wavelengths on the current OMS section, calculate the average optical power of all OCh wavelengths in the maintenance state, and determine the difference between the single-wavelength optical power and average optical power. The OD system considers that the optical power is flat when the difference between the single-wavelength optical power and average optical power does not exceed the alarm threshold.
3. The monitoring information is reported to the OD system on the U2000.
4. The OD system processes the monitored performance data and displays it on GUIs.
The
following describes the process of monitoring the input optical power of the
receive-end OTU board:
1. Using the OD system, a user sends a task of monitoring the input optical power of the receive-end OTU board.
2. The OD system determines whether the input optical power is out of the permitted range by checking for the R_LOS, IN_PWR_LOW, or IN_PWR_HIGH alarm on the OTU board.
3. The monitoring information is reported to the OD system on the U2000.
4. The OD system processes the alarm information.
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