A-5
Running H/F 1
Cabling and Technology Information
Under certain circumstances, depending on the cable used and the lengths of
the cable runs, an external Mode Conditioning Patch Cord may need to be
installed between the Gigabit-LX transmitting device and the multimode
network cable to provide the transmission conditioning. If you experience a
high number of transmission errors on those ports, usually CRC or FCS errors,
you may need to install one of these patch cords between the fiber-optic port
in your switch and your multimode fiber-optic network cabling, at both ends
of the network link.
The patch cord consists of a short length of single mode fiber cable coupled
to graded-index multimode fiber cable on the transmit side, and only multi-
mode cable on the receive side. The section of single mode fiber is connected
in such a way that it minimizes the effects of the differential mode delay in the
multimode cable.
Note Most of the time, if you are using good quality graded-index multimode fiber
cable that adheres to the standards listed above, there should not be a need
to use mode conditioning patch cords in your network. This is especially true
if the fiber runs in your network are relatively short.
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