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Cisco ONS 15454 DWDM Installation and Operations Guide, R6.0
August 2005
Chapter 18 Network Reference
18.7 Network Optical Safety––Automatic Laser Shutdown
18.7 Network Optical Safety––Automatic Laser Shutdown
Automatic laser shutdown (ALS) is a technique used to automatically shut down the output power of
OSC laser transmitters (contained in the OSCM and OSC-CSM cards) and optical amplifiers (contained
in OPT-BST cards) in the event of a fiber break. Cards with OSC laser transmitters and optical amplifiers
(OPT-BST only) can be provisioned as follows with respect to ALS:
•
Disable: ALS is off; the laser and optical amplifiers (OPT-BST only) is not automatically shut down
when a traffic outage loss of signal (LOS) occurs
•
Auto Restart: ALS is on. The laser and optical amplifiers (OPT-BST only) automatically shuts down
when traffic outages (LOS) occur. It automatically restarts when the conditions that caused the
outage are resolved.
Note
Auto Restart is the default ALS provisioning.
•
Manual Restart: ALS is on. The laser and optical amplifiers (OPT-BST only) automatically shuts
down when traffic outages (LOS) occur. However, the laser must be manually restarted when
conditions that caused the outage are resolved.
•
Manual Restart for Test: Manually restarts the laser and optical amplifiers (OPT-BST only) for
testing.
In the following paragraphs, two ALS scenarios are given:
•
Nodes using OPT-BST cards (amplified nodes)
•
Nodes using OSC-CSM cards (passive nodes)
18.7.1 Scenario 1: Fiber Cut in Nodes Using OPT-BST/OPT-BST-E Cards
shows nodes using OPT-BST/OPT-BST-E cards with a fiber cut between them.
Summary of Contents for ONS 15454 DWDM
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