Related Documentation
- M, T Series
- List of Common SONET Alarms and Errors
- Displaying SONET Alarms and Errors
- Locating Most Common SONET Alarms and Errors
- Locating Loss of Signal Alarms
- Locating Alarm Indication Signal Alarms
- Locating Remote Defect Indication Alarms
- Locating Bit Error Rate Alarms
- Locating Payload Label Mismatch Path Alarms
- Locating Loss of Pointer Path Alarms
- Locating Unequipped Payload Alarms
- Locating Phase Lock Loop Alarms
Locating Remote Error Indication Line Errors
A remote error indication (REI) is sent upstream to signal an error condition. There are two types of REI alarms:
- Remote error indication line (REI-L) is sent to the upstream LTE when errors are detected in the B2 byte.
- Remote error indication path (REI-P) is sent to the upstream PTE when errors are detected in the B3 byte.
Example of Only an REI-P Counter Incrementing
Problem
Figure 1 shows an REI-P Counter Incrementing. The wavy line indicates that there is a line error in the section between ADM 1 and ADM 2.
Solution
All diagnostics are from the perspective of Router 2 (the Juniper Networks router).
Figure 1: Example of a Router Receiving Only an REI-P Counter Incrementing
Meaning
In Figure 1, the progression of events occurring after the failure is as follows:
- ADM 1 detects parity errors in the B1 byte.
- ADM 1 sends an REI-L upstream to ADM 2.
- Router 1 detects parity errors in the B3 byte.
- Router 1 sends an REI-P upstream to Router 2.
- Router 2 only sees an REI-P incrementing counter.
Example of Both REI-L and REI-P Counters Incrementing
Problem
Figure 2 shows both REI-L and REI-P Counters Incrementing. The wavy line indicates that there is a line error in the section between Repeater 2 and Router 2.
Solution
All diagnostics are from the perspective of Router 2 (the Juniper Networks router).
Figure 2: Example of a Router Receiving Both An REI-L and REI-P Counter Incrementing
Meaning
In Figure 2, the progression of events occurring after the failure is as follows:
- Repeater 2 detects some parity errors in the B1 byte from a corrupted SONET frame.
- ADM 2 detects parity errors in the B2 byte.
- ADM 2 sends an REI-L upstream to Router 2.
- Router 1 detects parity errors in the B3 byte.
- Router 1 sends back an REI-P upstream to Router 2.
- Router 2 sees incrementing REI-L and REI-P errors.
Related Documentation
- M, T Series
- List of Common SONET Alarms and Errors
- Displaying SONET Alarms and Errors
- Locating Most Common SONET Alarms and Errors
- Locating Loss of Signal Alarms
- Locating Alarm Indication Signal Alarms
- Locating Remote Defect Indication Alarms
- Locating Bit Error Rate Alarms
- Locating Payload Label Mismatch Path Alarms
- Locating Loss of Pointer Path Alarms
- Locating Unequipped Payload Alarms
- Locating Phase Lock Loop Alarms
Published: 2012-12-10
Related Documentation
- M, T Series
- List of Common SONET Alarms and Errors
- Displaying SONET Alarms and Errors
- Locating Most Common SONET Alarms and Errors
- Locating Loss of Signal Alarms
- Locating Alarm Indication Signal Alarms
- Locating Remote Defect Indication Alarms
- Locating Bit Error Rate Alarms
- Locating Payload Label Mismatch Path Alarms
- Locating Loss of Pointer Path Alarms
- Locating Unequipped Payload Alarms
- Locating Phase Lock Loop Alarms
