Cisco ONS 15454 DWDM Reference Manual page 509

Chapter 10 Network Reference
80 C-band channels, using the 40-WSS-C, 40-DMX-C, 40-WSS-CE, and 40-DMX-CE cards
•
104 channels (32 L-band odd channels and 72 C-band channels), using the 32WSS-L and 32DMX-L
•
cards as a set to cover 32 L-band odd channels and the 32WSS, 32DMX, 40-WSS-CE, and
40-DMX-CE cards as a set to cover 72 C-band odd and even channels
• 112 channels (32 L-band odd channels and 80 C-band even channels), using the 32WSS-L and
32DMX-L cards as a set to cover 32 L-band odd channels and the 40-WSS-C, 40-DMX-C,
40-WSS-CE, and 40-DMX-CE, cards as a set to cover 80 C-band odd and even channels
The following node topologies are available for even channel management or odd-plus-even channel
management:
Terminal node
•
Hub node
•
ROADM node
•
OSC regeneration and optical line amplification node
•
The external ONS 15216-ID-50 module is a 50 GHz/100GHz optical interleaver/deinterleaver that is
required to combine or separate odd and even C-band channels. This module increases capacity by
combining two optical data streams into a single, more densely spaced stream. The module can be used
in multiplexer mode to combine two 100-GHz optical signal streams into one 50-GHz stream, and in
demultiplexer mode to separate the 50-GHz stream into two 100-GHz streams.
The ONS 15216-SC-CL module is an external C-band and L-band splitter/combiner module that
combines and separates the C-band odd/even channels and the L-band odd channels.
An example of a 104-channel C-band plus L-band ROADM node is shown in
page 10-38. There are 72 C-band even channels and 32 L-band odd channels. The signal flow from the
left side of the diagram to the right side is given in the following steps. The signal flow from the right
side to the left is identical.
All the C-band and L-band signals enter the ONS 15216-SC-CL.
1.
When the signals exit the ONS 15216-SC-CL, the 72 C-band even and odd channel signals are sent
2.
to the upper set of blocks and the 32 L-band odd channel signals are sent to the lower set of blocks.
The 72 C-band even and odd channel signals pass through a preamplifier, then through an
3.
ONS 15261-ID-50 and wavelength selective switch (WSS). Only the channels to be dropped are sent
to the demultiplexer (DMX) block. There are two such sets of blocks, one set for the 32 odd C-band
channels, and one set for the 40 even C-band channels.
4. The 32 L-band odd channel signals pass through a preamplifier, then through two 32-channel
wavelength selective switch (32WSS-L) cards. Only the channels to be dropped are sent to the
32-channel demultiplexer (32DMX-L) card.
At the upper set of blocks, the ONS 15261-ID-50 deinterleaves the 32 C-band odd channels from
5.
the 40 C-band even channels. The 32 C-band odd channels are routed through the top blocks (two
32WSS cards and one 32DMX card), while the 40 C-band even channels are routed through the
lower blocks (two 40-WSS-CE cards and one 40-DMX-CE card).
When a signal enters a 32WSS-L or 40-WSS-CE card, it is split. Part of the signal (the channels that
6.
are to be dropped) goes to the32 DMX-L card or 40-DMX-CE card so that channels can be dropped
for use by the client equipment. The other part of the signal goes to the next 32WSS-L card or
40_DMX-CE card, where the channels can be passed through or blocked, and channels can be added
to the stream from the client equipment.
78-18343-02
10.10 Even Band Management
Cisco ONS 15454 DWDM Reference Manual, R8.5
Figure 10-26 on
10-37