17-30
Cisco ONS 15454 DWDM Installation and Operations Guide, R6.0
August 2005
Chapter 17 Node Reference
17.3 Automatic Node Setup
• Constant Attenuation Value—In this mode, the VOA is regulated to a constant attenuation
independent from the value of the input signal. Constant attenuation value mode is set on the
following VOAs:
–
OADM band card VOAs on express and drop paths (as operating mode)
–
OADM channel card VOAs during power insertion startup
–
The multiplexer/demultiplexer card VOAs during power insertion startup
• Constant Power Value—In this mode, the VOA values are automatically regulated to keep a constant
output power when changes occur to the input power signal. This working condition is set on OADM
channel card VOAs as “operating” and on 32MUX-O, 32WSS, 32DMX-O, and 32DMX card VOAs
as “operating mode.”
In the normal operating mode, OADM band card VOAs are set to a constant attenuation, while OADM
channel card VOAs are set to a constant power. ANS requires the following VOA provisioning
parameters to be specified:
• Target attenuation (OADM band card VOA and OADM channel card startup)
• Target power (channel VOA)
To allow you to modify ANS values based on your DWDM deployment, provisioning parameters are
divided into two contributions:
• Reference Contribution (read only)—Set by ANS.
• Calibration Contribution (read and write)—Set by user.
The ANS equalization algorithm requires the following knowledge of the DWDM transmission element
layout:
• The order in which the DWDM elements are connected together on the express paths
• Channels that are dropped and added
• Channels or bands that have been configured as passthrough
ANS assumes that every DWDM port has a line direction parameter that is either west to east (W-E) or
east to west (E-W). ANS automatically configures the mandatory optical connections according to
following main rules:
• Cards equipped in Slots 1 to 6 have a drop section facing west.
• Cards equipped in Slots 12 to 17 have a drop section facing east.
• Contiguous cards are cascaded on the express path.
• 4MD-xx.x and AD-xB-xx.x are always optically coupled.
• A 4MD-xx.x absence forces an optical passthrough connection.
• Transmit (Tx) ports are always connected to receive (Rx) ports.
Optical patch cords are passive devices that are not autodiscovered by ANS. However, optical patch
cords are used to build the alarm correlation graph. From CTC or TL1 you can:
• Calculate the default connections on the NE.
• Retrieve the list of existing connections.
• Retrieve the list of free ports.
• Create new connections or modify existing ones.
• Launch ANS.
After you launch ANS, the following status are provided for each ANS parameter:
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