Scenario 2: Fiber Cut In Nodes Using Osc-Csm Cards - Cisco ONS 15454 DWDM Installation And Operation Manual

16.4.2 Scenario 2: Fiber Cut in Nodes Using OSC-CSM Cards

8.
9.
10.
11.
12.
13.
When the fiber is repaired, either an automatic or manual restart at the Node A OPT-BST/OPT-BST-E
transmitter or at the Node B OPT-BST/OPT-BST-E transmitter is required. A system that has been shut
down is reactivated through the use of a restart pulse. The pulse is used to signal that the optical path has
been restored and transmission can begin. For example, when the far end, Node B, receives a pulse, it
signals to the Node B OPT-BST/OPT-BST-E transmitter to begin transmitting an optical signal. The
OPT-BST/OPT-BST-E receiver at Node A receives that signal and signals the Node A
OPT-BST/OPT-BST-E transmitter to resume transmitting.
During a laser restart pulse, automatic power reduction (APR) is disabled and the laser power does not
Note
exceed Class 1 limits.
16.4.2 Scenario 2: Fiber Cut in Nodes Using OSC-CSM Cards
Figure 16-9
Cisco ONS 15454 DWDM Installation and Operations Guide, R4.7
16-20
Power monitoring photodiode detects a LOS on the OSC and OSCM detects LOS
Power monitoring photodiode detects a LOS for the optical payload
LOS is declared
The OPT-BST/OPT-BST-E amplifier laser is shut down
The OSCM laser is shut down
The OPT-PRE laser is shut down
shows nodes using OSC-CSM cards with a fiber cut between them.
Chapter 16 DWDM Network Reference
December 2004