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Cisco ONS 15454 DWDM Installation and Operations Guide, R6.0
April 2006
Chapter 16 Card Reference
16.7.6 32WSS Card
Figure 16-53
32WSS Optical Block Diagram
The EX PORT and COM PORT operate as follows:
•
EXP RX Port Add Channel/Pass-through Processing
The incoming optical signal is received at the EXP RX port from the other 32WSS module within
the network element. The incoming aggregate optical signal is demultiplexed into 32 individual
wavelength components, or channels. Then each channel is individually processed by the optical
switch, which does add/pass-through processing. Under software control, the switch either selects
the optical channel coming in from the demultiplexer (the pass-through channel) or it selects the
external ADD channel. If the ADD port channel is selected, the optical signal coming from the
demultiplexer is blocked, and the ADD channel is transmitted in its place.
After the optical switch stage, each of the channels passes through a VOA. Then all of the channels
are multiplexed together into an aggregate optical signal, which is sent out on the COM TX port.
The output is typically connected to an OPT-BST or OPT-BST-E (in the event a booster amplifier is
needed) or to an OSC-CSM (if no amplification is needed).
•
COM RX Port Optical Splitter Processing
The incoming optical signal received at the COM RX port and is applied to the optical splitter within
the 32WSS. Channels that are designated to be dropped are diverted optically to the DROP TX port
by the splitter. The DROP TX port on the 32WSS is typically connected to the COM RX port of the
32DMX where the drop channels are dropped. Channels that are not dropped pass through the
optical splitter and flow out of the EXP TX port of the 32WSS. This optical signal is typically
connected to the other 32WSS module within the network element.
1
2
32
Add 32
32
1 pass-through
EXP RX port
(In from 32WSS)
EXP TX port
(To 32WSS)
DROP TX port
(To 32DMX)
2 pass-through
32 pass-through
Optical
splitter
Dropped
channels
2
Photodiode
VOA
COM RX port
(In from OPT-PRE
preamplifier or
OSC-CSM)
COM TX port
(To OPT-BST
or OSC-CSM)
Add 2
2
Add 1
1
115292
Optical
DMUX
(AWG)
Optical
MUX
(AWG)
p
(Add channel or
pass-through)
P1
P33
P2
P34
P32
P64
P65
P66
P67
P68
P69
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