Cisco Systems 7609 manual Patch Cord Installation, Differential Mode Delay

Appendix B Connector and Cable Specifications

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

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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.

	Cisco 7609 Internet Router Installation Guide
B-14	OL-5079-04