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Cisco ONS 15454 DWDM Reference Manual, R8.5
78-18343-02
Chapter 7 Reconfigurable Optical Add/Drop Cards
7.7 40-DMX-C Card
7.7 40-DMX-C Card
Note See the “A.7.6 40-DMX-C Card Specifications” section on page A-29 for hardware specifications.
Note For 40-DMX-C safety label information, see the “7.2 Safety Labels for Class 1M Laser Product Cards”
section on page 7-9.
The single-slot 40-Channel Demultiplexer C-band (40-DMX-C) card demultiplexes 40 100-GHz-spaced
channels identified in the channel plan (Table 7-21 on page 7-38), and sends them to dedicated output
ports. The overall optical power can be adjusted using a single VOA that is common to all channels. The
40-DMX-C card is unidirectional, optically passive, and can be installed in Slots 1 to 6 and 12 to 17.
7.7.1 40-DMX-C Faceplate Ports
The 40-DMX-C has two types of ports:
• COM RX port: COM RX is the line input port for the aggregate optical signal being demultiplexed.
This port is supported by a VOA for optical power regulation and a photodiode for per-channel
optical power monitoring.
Note By default, the VOA is set to its maximum attenuation for safety purposes (for example,
electrical power failure). A manual VOA setting is also available.
• DROP TX ports (1 to 40): On its output, the 40-DMX-C card provides 40 drop ports that are
typically used for dropping channels within the ROADM node. These ports are connected using five
physical connectors on the front panel that accept MPO client input cables. (MPO cables break out
into eight separate cables.) The 40-DMX-C card also has one LC-PC-II optical connector for the
main input.
Figure 7-18 shows the 40-DMX-C card faceplate.
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