Patch Cord Installation; Differential Mode Delay - Cisco 7609-S Installation Manual

Cable Specifications

Patch Cord Installation

Warning

Differential Mode Delay

Cisco 7609 Internet Router Installation Guide
B-14
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
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.
Appendix B Connector and Cable Specifications
To cable plant
OL-5079-04