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Network Connection Considerations
Figure 2-25
The single-mode transmitter uses a small laser to transmit the light signal to the ring. Keep the
transmit port covered whenever a cable is not connected to it. Although multimode transceivers
typically use LEDs (not lasers) for transmission, keep open ports covered and avoid staring into open
ports or apertures.
Warning
products when no fiber cable is connected. Avoid exposure and do not stare into open apertures. This
product meets the Class 1 Laser Emission Requirement from CDRH FDDI.
The multimode network processor module connectors are FDDI-standard physical sublayer (PHY)
connectors. The media interface connector (MIC) connects to FDDI standard 62.5/125 micron
multimode fiber-optic cable.
Figure 2-26 shows the MIC typically used for network and chassis connections in multimode FDDI
applications.
Figure 2-26
A dual-attachment module configuration requires two connections: one to the primary ring and one
to the secondary ring. The PHY-A port is the bottom port (see Figure 2-24 and Figure 2-27), and
PHY-B is the top port on both the multimode and single-mode modules. To connect to another
dual-attachment station, connect PHY-A on the module to PHY-B on the other DAS and PHY-B on
the module to PHY-A on the other DAS.
2-26 Cisco 4000 Series Hardware Installation and Maintenance
Single-Mode FDDI Network Interface Connectors, FC Type
Invisible laser radiation may be emitted from the aperture ports of the single-mode FDDI
Multimode FDDI Network Interface Connector, MIC Type
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