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HP J8726A Installation Manual: Mode Conditioning Patch Cord

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Table 4.
Technology Distance Specifications(Continued)
10-Gig ER
CX4 Media Converter
Cat 6 cabling requires TIA TSB-155A testing for 500 MHz operation and ANEXT.
For distances less than 20km, a 10dB attenuator must be used. For distances between 20km and 40km, a 5dB attenuator
must be used. Attenuators can be purchased from most cable vendors.
Supported cable type
single mode fiber
12-strand female-female multi-
mode fiber MPO ribbon cable
with MTP connectors, in a
crossover (key up/key up)

Mode Conditioning Patch Cord

The following information applies to installations in which multimode fiber-
optic cables are connected to a Gigabit-LX port or a 10-Gigabit LRM 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 or 10-Gigabit LRM 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.
Multimode fiber
Supported distances
modal bandwidth
2 - 40,000 meters
150 MHz*km
1 - 50 meters
500 MHz*km
1 - 100 meters
2000 MHz*km
1 - 300 meters


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