Automatic Laser Shutdown

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Automatic Laser Shutdown, or ALS, is a method for assuring Laser safety in Optical Transmission Systems (Like optical SDH) registered under US Patent #6194707.

ALS is a semi-intelligent method which cuts the Tx line if the Rx line is inactive, and checks for link restoration in short intervals, therefore guaranteeing safety during system service and resumed function when the line is restored.

[edit] References

• Patent
• A Cisco article on "Automatic Laser Shutdown on the Cisco Metro 1500"