Procedure 5-39: Clear "inc. timing ref. off frequency" alarm
Before you begin
Prior to performing this procedure:
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Refer to Before you begin and Required equipment in this chapter.
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Refer to Laser safety and Electrostatic discharge in Chapter 1, Safety.
Steps
Complete the following steps to clear an inc. timing ref. off frequency alarm.
1 |
From the WaveStar® CIT System View, click the Alarm List button and locate the inc. timing ref. off frequency alarm in the resulting alarm list. | ||||||||
2 |
Refer to the Probable Cause column in the alarm list, determine the affected STM-N line, and note the corresponding AID. | ||||||||
3 |
Important! The likely cause is a synchronization condition/alarm at an upstream network element. Follow local procedures for addressing synchronization conditions/alarms at the far-end network element. | ||||||||
4 |
Important! If the affected circuit pack Slot Protection State parameter is Unprotected, the network element only monitors the selected line timing reference. When an off-frequency defect is detected on the selected line timing reference and it is protected, the network element switches to the other line timing reference. The network element no longer monitors the original selected line timing reference; therefore, the alarm does not automatically clear when the defect clears. To clear the alarm the affected Port Monitoring Mode parameter must be provisioned AUTO. If the defect still exists, the alarm is reported. When an off-frequency defect is detected on the selected line timing reference and it is not protected, the network element switches to the holdover mode and continues monitoring the original selected (but failed) line timing reference. The alarm automatically clears when the defect clears. If the circuit pack Slot Protection State parameter is Protected, the network element monitors both line timing references; therefore, the alarm automatically clears when the defect clears. Select View → Equipment to access the affected circuit pack/port and determine the circuit pack Slot Protection State and port Application parameter values.
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5 |
From the System View, select Configuration → Equipment to access the required port and provision the Port Monitoring Mode parameter to AUTO. Result: A warning message appears asking you to confirm executing this command. Click Yes and Close. | ||||||||
6 |
From the System View at the local network element, click the Alarm List button and click Refresh. | ||||||||
7 |
Is the inc. timing ref. off frequency alarm still present?
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8 |
Disconnecting cables may disrupt service. Before taking action, determine the extent of service disruption caused by disconnecting cables or replacing a pluggable transmission module. Then, perform the action(s) deemed appropriate in light of the traffic being carried and the nature of the failure. Visually check the local receive fiber connections between the circuit pack faceplate/pluggable transmission module and the LGX panel or equivalent connection point for faulty connections or damage.
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9 |
Important! If the circuit pack Slot Protection State parameter is Unprotected, the network element only monitors the selected line timing reference. When an off-frequency defect is detected on the selected line timing reference and it is protected, the network element switches to the other line timing reference. The network element no longer monitors the original selected line timing reference; therefore, the alarm does not automatically clear when the defect clears. To clear the alarm the affected Port Monitoring Mode parameter must be provisioned AUTO. If the defect still exists, the alarm is reported. If required, select Configuration → Equipment to access the required port and provision the Port Monitoring Mode parameter to AUTO. Result: A warning message appears asking you to confirm executing this command. Click Yes and Close. | ||||||||
10 |
From the System View, click the Alarm List button and click Refresh. | ||||||||
11 |
Is the inc. timing ref. off frequency alarm still present?
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12 |
Disconnecting cables and/or replacing pluggable transmission modules may disrupt service. Before taking action, determine the extent of service disruption caused by disconnecting cables or replacing a pluggable transmission module. Then, perform the action(s) deemed appropriate in light of the traffic being carried and the nature of the failure. Replace the affected local pluggable transmission module. Reference: Procedure 6-6: Replace pluggable transmission module | ||||||||
13 |
Important! If the circuit pack Slot Protection State parameter is Unprotected, the network element only monitors the selected line timing reference. When an off-frequency defect is detected on the selected line timing reference and it is protected, the network element switches to the other line timing reference. The network element no longer monitors the original selected line timing reference; therefore, the alarm does not automatically clear when the defect clears. To clear the alarm the affected Port Monitoring Mode parameter must be provisioned AUTO. If the defect still exists, the alarm is reported. If required, select Configuration → Equipment to access the required port and provision the Port Monitoring Mode parameter to AUTO. Result: A warning message appears asking you to confirm executing this command. Click Yes and Close. | ||||||||
14 |
From the System View, click the Alarm List button and click Refresh. | ||||||||
15 |
Is the inc. timing ref. off frequency alarm still present?
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16 |
Disconnecting cables and/or replacing circuit packs may disrupt service. Before taking action, determine the extent of service disruption caused by disconnecting cables or replacing a circuit pack. Then, perform the action(s) deemed appropriate in light of the traffic being carried and the nature of the failure. Replace the affected local circuit pack. Reference: Procedure 6-4: Replace VLNC5x SONET/SDH transport circuit pack | ||||||||
17 |
Important! If the circuit pack Slot Protection State parameter is Unprotected, the network element only monitors the selected line timing reference. When an off-frequency defect is detected on the selected line timing reference and it is protected, the network element switches to the other line timing reference. The network element no longer monitors the original selected line timing reference; therefore, the alarm does not automatically clear when the defect clears. To clear the alarm the affected Port Monitoring Mode parameter must be provisioned AUTO. If the defect still exists, the alarm is reported. If required, select Configuration → Equipment to access the required port and provision the Port Monitoring Mode parameter to AUTO. Result: A warning message appears asking you to confirm executing this command. Click Yes and Close. | ||||||||
18 |
From the System View, click the Alarm List button and click Refresh. | ||||||||
19 |
Is the inc. timing ref. off frequency alarm still present?
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20 |
Follow local procedures to isolate and clear the fiber/cable trouble between the far-end network element and the local network element. End of steps |
