Figure 7-11 32Wss-L Optical Block Diagram - Cisco ONS 15454 DWDM Reference Manual

7.4.2 32WSS-L Block Diagram
Figure 7-11 32WSS-L Optical Block Diagram
EXP RX port
(In from 32WSS-L)
P66
P69
DROP TX port
(To 32DMX-L)
channels
EXP TX port
(To 32WSS-L)
P65
The EXP RX PORT and COM RX PORT operate as follows:
•
•
Cisco ONS 15454 DWDM Reference Manual, R8.5
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1 pass-through
1
Optical
DMUX
(AWG)
2 pass-through
2
2
32 pass-through
32
P68
Dropped
Optical
splitter
EXP RX Port Add Channel/Pass-through Processing
The incoming optical signal is received at the EXP RX port from the other 32WSS-L 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-AMP-L 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-L 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-L where the
drop channels are being dropped. Channels that are not dropped pass through the optical splitter and
flow out of the 32WSS-L card EXP TX port. Typically, this optical signal is connected to the other
32WS-L module within the NE.
Optical switch
(Add channel or
pass-through)
Add 1
P1 P33
Add 2
P2 P34
32
Add 32
P32 P64
Chapter 7 Reconfigurable Optical Add/Drop Cards
1
Optical
COM TX port
MUX
(To OPT-AMP-L
(AWG)
booster
or OSC-CSM)
2
P67
COM RX port
(In from OPT-AMP-L
preamplifier
or OSC-CSM)
VOA
Photodiode
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