This section describes how to enable or disable the optical module laser.
Before locating or troubleshooting a link failure, maintenance engineers should ensure that the optical module laser is disabled so that it cannot cause injury. The optical module can be configured to disable the laser automatically if it detects a link failure. The laser can also be disabled manually. If the optical module is configured to disable the laser automatically, the laser is not immediately re-enabled when the link failure is cleared. However, maintenance engineers can enable the optical module laser manually to check whether services have recovered.