Installation guide

Making External Connections to Cisco 4000 Series Routers 4-79
Network Connection Considerations
Figure 4-34 Dual-Attachment Single-Mode FDDI Module with SC-type
Connectors—End View
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 Invisible laser radiation may be emitted from the aperture ports of the
single-mode FDDI 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 Center for Devices and Radiological Health (CDRH) FDDI. (To see translated
versions of this warning, refer to the appendix “Translated Safety Warnings.”)
The multimode network processor module connectors are FDDI-standard PHY connectors.
The media interface connector (MIC) connects to FDDI standard 62.5/125-micron
multimode fiber-optic cable.
Figure 4-35 shows the MIC typically used for network and chassis connections in
multimode FDDI applications.
H6268
PHY-B
PHY-A
Alignment groove
Mounting
screw locations
Alignment groove
XMTR RCVR
AVOID EXPOSURE–INVISIBLE
LASER RADIATION IS EMITTED
FROM THESE APERTURES.
PHY–B
RING OP
PHY–A
RING OP
FDDI
WARNING
CISCO SYSTEMS, INC.
170 WEST TASMAN DRIVE
SAN JOSE, CA 95134-1706
DATE:
“Complies with FDA Radiation
Performance Standards, 21 CFR,
Subchapter J”
1300 NM
CLASS 1 LASER PRODUCT
LASERKLASSE 1