Chapter 17 Node Reference - Cisco ONS 15454 DWDM Installation And Operation Manual

Chapter 17 Node Reference
17.1.1 Hub Node
A Dispersion Compensation Unit (DCU) can also be added, if necessary. The hub node does not support
both DWDM and time-division multiplexing (TDM) applications since the DWDM slot requirements do
not leave room for TDM cards. Figure 17-1 shows a hub node configuration with 32MUX-O and
32DMX-O cards installed.
Note The optical add/drop multiplexing (OADM) AD-xC-xx.x or AD-xB-xx.x cards are not part of a hub node
because the 32MUX-O and 32DMX-O cards drop and add all 32 channels; therefore, no other cards are
necessary.
Figure 17-1 Hub Node Configuration Example
Figure 17-2 shows the channel flow for a hub node. Up to 32-channels from the client ports are
multiplexed and equalized onto one fiber using the 32MUX-O card. Then, multiplexed channels are
transmitted on the line in the eastward direction and fed to the Optical Booster (OPT-BST) amplifier.
The output of this amplifier is combined with an output signal from the Optical Service Channel Modem
(OSCM) card and transmitted toward the east line.
Received signals from the east line port are split between the OSCM card and an Optical Preamplifier
(OPT-PRE). Dispersion compensation is applied to the signal received by the OPT-PRE amplifier, and
it is then sent to the 32DMX-O card, which demultiplexes and attenuates the input signal. The west
receive fiber path is identical through the west OPT-BST amplifier, the west OPT-PRE amplifier, and the
west 32DMX-O card.
Cisco ONS 15454 DWDM Installation and Operations Guide, R6.0
17-2
August 2005