HP ProCurve 5400zl User Manual download pdf (Page 91)

B-5

Switch Ports and Network Cables

Mode Conditioning Patch Cord for Gigabit-LX

Switch Ports and Network

Cables

Mode Conditioning Patch Cord for

Gigabit-LX

The following information applies to installations in which multimode fiber-

optic cables are connected to a Gigabit-LX port.

Note Mode Conditioning Patch Cord cables only apply to one Gigabit operation.

Mode Conditioning Patch Cord cables are not supported for 10 Gigabit

operation.

Unlike Gigabit-SX, which connects to only multimode fiber-optic cabling,

Gigabit-LX can use either single-mode or multimode cable. Multimode cable

has a design characteristic called “Differential Mode Delay”, which requires

that the transmission signals be “conditioned” to compensate for the cable

design and thus prevent resulting transmission errors. Since Gigabit-SX is

designed to operate only with multimode cable, Gigabit-SX mini-GBICs can

provide that transmission conditioning internally.

Gigabit-LX mini-GBICs, since they are designed to operate with both single-

mode and multimode cable, do not provide the transmission conditioning

internally. Thus, 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 the Gigabit-LX

ports, usually CRC or FCS errors, you may need to install one of these patch

cords between the Gigabit-LX port in your switch and your multimode fiber-

optic network cabling, and between the Gigabit-LX transmission device and

the network cabling at the other end of the multimode fiber-optic cable run.

A patch cord must be installed at both ends.

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.

Note If you are using good quality graded-index multimode fiber cable that adheres

to the standards listed on page 3, there should not be a need to use mode

conditioning patch cords. This is especially true if the fiber runs in your

network are relatively short. If you are using single-mode fiber-optic cabling,

there is no need to use mode conditioning patch cords. Connect the single-

mode network cable directly to the Gigabit-LX mini-GBIC.

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HP ProCurve 5400zl User Manual Page 91