7-15
Cisco ONS 15454 DWDM Reference Manual, R8.5
78-18343-02
Chapter 7 Reconfigurable Optical Add/Drop Cards
7.3.2 32WSS Block Diagram
Figure 7-8 32WSS Optical Block Diagram
The EXP RX PORT and COM RX 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 card within the
NE. The incoming aggregate optical signal is demultiplexed into 32 individual wavelengths, or
channels. Each channel is then individually processed by the optical switch, which performs
add/pass-through processing. By using software controls, the switch either selects the optical
channel coming in from the demultiplexer (that is, the pass-through channel) or it selects the
external ADD channel. If the ADD port channel is selected this channel is transmitted and the
optical signal coming from the demultiplexer is blocked.
After the optical switch stage, all of the channels are multiplexed 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 card (in the event a booster amplifier is needed) or to an OSC-CSM card (if no
amplification is needed).
• COM RX Port Optical Splitter Processing
The COM RX port receives the incoming optical signal and directs it to the 32WSS card’s optical
splitter. The splitter optically diverts channels that are designated to be dropped to the DROP TX
port. The DROP TX port is typically connected to the COM RX port of the 32DMX where the drop
channels are being dropped. Channels that are not dropped pass through the optical splitter and flow
out of the 32WSS card EXP TX port. Typically, this optical signal is connected to the other 32WSS
module within the NE.
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)
Optical switch
(Add channel or
pass-through)
P1 P33
P2 P34
P32 P64
P65
P66
P67
P68
P69
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