A-5
Specifications
Mode Conditioning Patch Cord
Technology Distance Specifications
Mode Conditioning Patch Cord
The following information applies to installations in which multimode fiber-
optic cables are connected to a Gigabit-LX port. Multimode cable has a design
characteristic called “Differential Mode Delay”, which requires the
transmission signals be “conditioned” to compensate for the cable design and
thus prevent resulting transmission errors.
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
multimode 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.
Technology Supported cable type Multimode fiber
modal bandwidth
Supported distances
100-FX multimode fiber any up to 2,000 meters
1000-T twisted-pair copper N/A up to 100 meters
1000-SX multimode fiber 160 MHz*km
200 MHz*km
400 MHz*km
500 MHz*km
2 - 220 meters
2 - 275 meters
2 - 500 meters
2 - 550 meters
1000-LX multimode fiber
single mode fiber
400 MHz*km
500 MHz*km
N/A
2 - 550 meters
2 - 550 meters
2 - 10,000 meters
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