Overview
This chapter explains how to configure and monitor automated power profile adjustments on Cisco NCS 1010 systems to mitigate signal degradation. It ensures stable performance across C and L bands by compensating for power transfer effects during signal outages and restoration.
| Feature Name | Release Information | Description |
|---|---|---|
| Band Failure Recovery (BFR) Pause |
Cisco IOS XR Release 7.10.1 |
Use the new bfr-pause configuration command from this release to pause the BFR function. Unlike in the previous releases, the BFR pause state is now preserved during a system reload. BFR pause stays paused indefinitely until you resume it. Command added: bfr-pause |
olc bfr-pause (Command deprecated) |
Cisco IOS XR Release 7.10.1 |
The command olc bfr-pause is deprecated starting R7.10.1. To pause and resume BFR, use the bfr-pause command. To upgrade from R7.9.1 to R7.10.1 or later with BFR pause enabled, before upgrading software, pause BFR on the OLT-C band using the olc bfr pause command before beginning the software upgrade. Once the upgrade is finished, pause and resume BFR using the bfr-pause configuration command on the OLT-C and OLT-L bands. |
| Band Failure Recovery (BFR) |
Cisco IOS XR Release 7.9.1 |
During the C+L band network bring up, as both the bands travel through the same fiber, optical power is transferred from higher frequency to lower frequency due to SRS (Stimulated Raman Scattering). This degrades the C-band channel power and causes the existing C-band power profile to change. BFR compensates for this dynamic power change by adjusting the power profile that minimizes the impact when upgrading from C-band to the C+L band network. BFR also adjusts power during a band failure to minimize the impact on the surviving band. |
Band Failure Recovery
This topic explains the band failure recovery mechanism used in optical networks. It details how the system compensates for power transfer between C-band and L-band signals and ensures stable operation and recovery during a band failure.
Events leading to band failure
This topic lists the typical events that can result in band failure for optical communication systems and provides an example scenario showing system output following an L-band failure.
Band failure recovery in various scenarios
This topic explains how band failure recovery (BFR) operates in various network fault scenarios. It outlines the procedures BFR follows, the conditions required for recovery, and the expected outcomes in each situation.