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Cisco ONS 15454 DWDM Installation and Operations Guide, R6.0
August 2005
Chapter 17 Node Reference
17.3 Automatic Node Setup
Figure 17-30
Amplified TDM Channel Flow Example With Amplifiers, AD-1C-xx.x Cards, and OSC-CSM Cards
17.3 Automatic Node Setup
Automatic node setup (ANS) is a TCC2/TCC2P function that adjusts values of the VOAs on the DWDM
channel paths to equalize the per-channel power at the amplifier input. This power equalization means
that at launch, all the channels have the same amplifier power level, independent from the input signal
on the client interface and independent from the path crossed by the signal inside the node. This
equalization is needed for two reasons:
•
Every path introduces a different penalty on the signal that crosses it.
•
Client interfaces add their signal to the ONS 15454 DWDM ring with different power levels.
To support ANS, the integrated VOAs and photodiodes are provided in the following ONS 15454
DWDM cards:
•
OADM band cards (AD-xB-xx.x) express and drop path
•
OADM channel cards (AD-xC-xx.x) express and add path
•
4-Channel Terminal Multiplexer/Demultiplexer (4MD-xx.x) input port
•
32-Channel Terminal Multiplexer (32MUX-O) input port
•
32-Channel Wavelength Selective Switch (32WSS) input port
•
32-Channel Terminal Demultiplexer (32DMX-O and 32DMX) output port
Optical power is equalized by regulating the VOAs. Based on the expected per-channel power, ANS
automatically calculates the VOA values by:
•
Reconstructing the different channels paths
•
Retrieving the path insertion loss (stored in each DWDM transmission element)
VOAs operate in one of three working modes:
•
Automatic VOA Shutdown—In this mode, the VOA is set at maximum attenuation value. Automatic
VOA shutdown mode is set when the channel is not provisioned to ensure system reliability in the
event that power is accidentally inserted.
110596
AD-1C-xx.x
OPT-BST
OPT-BST
OPT-PRE
TXP or
MXP or
LC
TXP or
MXP or
LC
AD-1C-xx.x
Ch
OSCM or
OSC-CSM
OSCM or
OSC-CSM
DCU
DCU
OPT-PRE
Ch
Содержание ONS 15454 DWDM
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