Cisco 7609-S Installation Guide - Page 108

Patch Cord Installation, Differential Mode Delay

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Cable Specifications Appendix B Connector and Cable Specifications Patch Cord Installation Warning Because invisible laser radiation may be emitted from the aperture of the port when no cable is connected, avoid exposure to laser radiation and do not stare into open apertures. Plug the end of the patch cord labeled "To Equipment" into the GBIC. (See Figure B-8.) Plug the end labeled "To Cable Plant" into the patch panel. The patch cord is 9.84 feet (3 meters) long and has duplex SC-type male connectors at each end. Figure B-8 Patch Cord Installation To equipment To cable plant 13089 Differential Mode Delay When an unconditioned laser source designed for operation on an SMF cable is directly coupled to an MMF cable, differential mode delay (DMD) might occur. DMD can degrade the modal bandwidth of the fiber-optic cable. This degradation causes a decrease in the link span (the distance between the transmitter and the receiver) that can be reliably supported. The Gigabit Ethernet specification (IEEE 802.3z) outlines parameters for Ethernet communications at a gigabit-per-second rate. The specification offers a higher-speed version of Ethernet for backbone and server connectivity using existing deployed MMF cable by defining the use of laser-based optical components to propagate data over MMF cable. B-14 Cisco 7609 Internet Router Installation Guide OL-5079-04

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Appendix B
Connector and Cable Specifications
Cable Specifications
B-14
Cisco 7609 Internet Router Installation Guide
OL-5079-04
Patch Cord Installation
Warning
Because invisible laser radiation may be emitted from the aperture of the
port when no cable is connected, avoid exposure to laser radiation and do
not stare into open apertures.
Plug the end of the patch cord labeled “To Equipment” into the GBIC.
(See
Figure B-8
.) Plug the end labeled “To Cable Plant” into the patch panel. The
patch cord is 9.84 feet (3 meters) long and has duplex SC-type male connectors at
each end.
Figure B-8
Patch Cord Installation
Differential Mode Delay
When an unconditioned laser source designed for operation on an SMF cable is
directly coupled to an MMF cable, differential mode delay (DMD) might occur.
DMD can degrade the modal bandwidth of the fiber-optic cable. This degradation
causes a decrease in the link span (the distance between the transmitter and the
receiver) that can be reliably supported.
The Gigabit Ethernet specification (IEEE 802.3z) outlines parameters for
Ethernet communications at a gigabit-per-second rate. The specification offers a
higher-speed version of Ethernet for backbone and server connectivity using
existing deployed MMF cable by defining the use of laser-based optical
components to propagate data over MMF cable.
To equipment
To cable plant
13089